Circular No. 19/2018/TT-BTTTT Issuing "National Technical Regulations on Ground Mobile Radio Equipment with Built-in Antennas for Analog Telephony"

 

CIRCULAR

ISSUING THE NATIONAL TECHNICAL REGULATION ON LAND MOBILE RADIO EQUIPMENT WITH AN INTEGRAL ANTENNA INTENDED PRIMARILY FOR ANALOGUE SPEECH

Pursuant to the Law on Standards and Technical Regulations dated June 29, 2006;

Pursuant to the Law on Telecommunications dated August 23, 11 ARTICLE 4. Finished traditional medicine is a form of traditional medicine that has undergone production processes, including packaging and labeling, using traditional or modern methods, belonging to one of the following forms: pills, liquids, tea, powder, extract, and other forms.

Pursuant to the Law on Radio Frequency dated August 23, 11 ARTICLE 4. Finished traditional medicine is a form of traditional medicine that has undergone production processes, including packaging and labeling, using traditional or modern methods, belonging to one of the following forms: pills, liquids, tea, powder, extract, and other forms.

Decree No. 127/2007/ND-CP dated August 1, 2007 concerning detailed regulations and guidance on implementation of certain provisions of the Law on Standards and Technical Regulations;Deputy ministers of ministerial-level agencies,a The Government provides detailed regulations and guidance on implementation of certain provisions of the Law on Standards and Technical Regulations;

Pursuant to the Decree No. 78/2018/ND-CP dated May 16, 2018 of the Government amending and supplementing certain provisions of the Decree No.Deputy ministers of ministerial-level agencies,27/2007/ND-CP dated August 1, 2007 of the Government providing detailed regulations on implementation of certain provisions of the Law on Standards and Technical Regulations; 17/2017/ND-CP dated February 17, 2017 of the Government stipulating functions, tasks, powers, and organizational structure of the Ministry of Information and Communications;

Decree No. 1The Minister of Information and Communication hereby issues this Circular stipulating the National Technical Regulation on land mobile radio equipment with an integral antenna intended primarily for analogue speech.gIssued together with this Circular is the National Technical Regulation on land mobile radio equipment with an integral antenna intended primarily for analogue speech (QCVN 37:2018/BTTTT).

Pursuant to the proposal of the Director of the Science and Technology Department,

2. The National Technical Regulation on land mobile radio equipment with an integral antenna intended primarily for analogue speech, designated as QCVN 37:2011/BTTTT, stipulated in Clause 1 Article 1 of Circular No. 29/2011/TT-BTTTT dated October 26, 2011 issued by the Minister of Information and Communications, ceases to be effective from July 1, 2019.ngThe Heads of the Office, Department of Science and Technology, Heads of agencies and units under the Ministry of Information and Communications, Directors of Provincial Departments of Information and Communications, and organizations and individuals related to this Circular shall be responsible for its implementation./.ng NATIONAL TECHNICAL REGULATION ON LAND MOBILE RADIO EQUIPMENT WITH AN INTEGRAL ANTENNA INTENDED PRIMARILY FOR ANALOGUE SPEECH

Article 1. National technical regulation on land mobile radio equipment using an integral antenna intended primarily for analogue speech

Article 2. Effective Date

1. This Circular shall take effect from July 1, 2019.

1.5. Designation

Article 3. 1.6. Abbreviations

 

QCVN 37:2018/BTTTT

2.1.1. Equipment to be measured

2.1.2. Measurement conditions, power supply, and ambient temperature

Table of Contents

Chapter 1. GENERAL PROVISIONS

1.1. Scope of Application

1.2. Applicability

1.3. Referenced Documents

1.4. Terms and Definitions

2.1.3. Other conditions

2.1.4. Interpretation of measurement results

Chapter 2. TECHNICAL PROVISIONS

2.1. General Requirements

2.2. Requirements for transmitters

2.2.1. Frequency error

2.2.2. Effective radiated power

2.2.3. Maximum allowable frequency deviation

2.2.4. Adjacent channel and interleaved channel power

2.2.5. Spurious emissions

2.2.6. Transmitter voice operation

2.2.7. Maximum transmission time

2.3. Requirements for receivers

2.3.1. Average available sensitivity (field strength, voice)

2.3.2. Co-channel interference rejection

2.3.3. Adjacent channel selectivity

2.3.4. Spurious response rejection

2.3.5. Intermodulation response rejection

2.3.6. Blocking characteristic

2.3.7. Spurious emissions

Appendix A (Provisions) Field Strength Measurement

Appendix B (Provisions) Technical Specifications for Specific Measurement Schemes

Appendix C (Provisions) Bandstop Filter (for SINAD Meter)

LIST OF REFERENCES

3. MANAGEMENT PROVISIONS

4. RESPONSIBILITIES OF ORGANIZATIONS AND INDIVIDUALS

Chapter 5. ORGANIZATION OF IMPLEMENTATION

Preface

QCVN 37:2018/BTTTT replaces QCVN 37:2011/BTTTT.

QCVN 37:2018/BTTTT complies with standard ETSI EN 300 296 V2.1.1 (2016-03) of the European Telecommunications Standards Institute (ETSI).

QCVN 37:2018/BTTTT was compiled by the Post and Telecommunications Science and Technology Institute, reviewed and submitted for approval by the Department of Science and Technology, and issued together with Circular No.  /2018/TT-BTTTT dated  month  year 2018.

 

TECHNICAL REGULATION ON LAND MOBILE RADIO EQUIPMENT WITH AN INTEGRAL ANTENNA INTENDED PRIMARILY FOR ANALOGUE SPEECHinternational LAND MOBILE RADIO EQUIPMENT WITH AN INTEGRAL ANTENNA

INTENDED

FOR ANALOGUE SPEECH

This regulation applies to radio equipment with an integral antenna using angle modulation in terrestrial mobile services, primarily for analogue speech, operating in the radio frequency band from 30 MHz to 1 000 MHz with channel spacings of 12.5 kHz and 25 kHz.

 

NATIONAL TECHNICAL REGULATION ONU,This regulation also applies to PMR 446 equipment in accordance with ECC/DEC/(15)05 that meets the requirements for low-power walkie-talkie devices exempted from individual licensing for radio frequency usage as stipulated in Circular No. 46/2016/TT-BTTTT dated December 26, 2016 of the Minister of Information and Communications. Note that PMR 446 equipment requires combined receiver-transmitter functionality and may have a maximum transmission time requirement of 180 seconds and VOX.ề Table 1 - Frequency bands TransmissionFrom 30 MHz to 1 000 MHzThis regulation applies to organizations and individuals, both domestic and foreign, engaged in production and business activities involving equipment within the scope regulated in Section 1.1 throughout the territory of Vietnam.ETSI TR 100 028 (V1.4.1) (12-2001) (all parts): "Electromagnetic compatibility and Radio spectrum Matters (ERM); Uncertainties in the measurement of mobile radio equipment characteristics".2. The Medical Examination Board includes: The Central Medical Examination Board.

2.1.2. Measurement conditions, power supply, and ambient temperature

Chapter 1. GENERAL PROVISIONS

1.1. Scope of Application

ANSI C63.5 (2006): "American National Standard for Calibration of Antennas Used for Radiated Emission Measurements in Electro Magnetic Interference".

ETSI TR 100 028-2 (V1.4.1) (12-2001): "Electromagnetic compatibility and Radio spectrum Matters (ERM); Uncertainties in the measurement of mobile radio equipment characteristics; Part 2".

Recommendation ITU-T 0.41 (1994): "Psophometer for use on telephone-type circuits".No. radio frequencies

1.Thông tư này áp dụng đối với tổ chức, cá nhân có liên quan đến hoạt động kinh doanh đối tượng thủy sản nuôi chủ lực trên lãnh thổ Việt Nam.

ETSI TR 102 273 (V1.2.1) (all parts): "Electromagnetic compatibility and Radio spectrum Matters (ERM); Improvement on Radiated Methods of Measurement (using test site) and evaluation of the corresponding measurement uncertainties".

1.3. Referenced Documents

1.4.1. 50 Ω

50 Ohm impedance.

1.4.2. Adjacent and interleaved channels

(adjacent and alternate channels)

- Adjacent channel: Two channels separated from the desired channel by one channel spacing.

- Interleaved channel: Two channels separated from the desired channel by two channel spacings.

Figure 1 - Definition of adjacent and interleaved channels

1.4.3. Angle modulation

1.4. Terms and Definitions

(angle modulation)

50 Ohms impedance.

1.4.2. Adjacent and alternate channels (adjacent and alternate channels)

- Adjacent channel: Two channels with a frequency offset from the desired channel equal to one channel spacing.

- Alternate channel: Two channels with a frequency offset from the desired channel equal to two channel spacings.

Figure 1 - Definition of adjacent and alternate channels

1.4.3. Angle modulation (angle modulation)

Article ||| Frequency synthesis or frequency modulation.

1.4.4. Audio frequency load (audio frequency load)

An audio frequency load is a resistor or an equivalent substitute for that resistor, having a value equal to the impedance of the audio frequency converter at 1,000 Hz as specified by the manufacturer and capable of withstanding the maximum audio frequency output power of the device under test.

NOTE: In some cases, it is necessary to place an isolation transformer between the output terminals of the receiver under test and this load.

1.4.5. Audio frequency termination â(audio frequency termination) An audio frequency termination is a connection used for testing the receiver except for the audio frequency load.

NOTE: Typically, the termination equipment is selected by the manufacturer or agreed upon between the manufacturer and the testing laboratory and must be clearly stated in the test records. If special equipment is required, it should be provided by the manufacturer of the equipment.

1.4.6. Conducted measurements

(conducted measurements) Measurements are performed by direct connection to the device under test.

1.4.7. Integral antenna

(integral antenna) An antenna designed to be attached to the device without using an external 50 Ω impedance connector and considered part of the device.

NOTE: An integral antenna may be fixed inside or outside the device.

1.4.8. Low power equipment

(low power equipment)of the Government stipulating functions, tasks, powers, and organizational structure of the Ministry of Home Affairsp Equipment where the effective radiated power of the transmitter, measured according to Section 2.2.2, does not exceed 500 mW.

1.4.9. Psophometric weighting network

(psophometric weighting network) The psophometric weighting network is described in Recommendation ITU-T O.41.

1.4.10. Radiated measurements

(radiated measurements) Measurement of the absolute value of the radiated field strength.

1.4.11. SINAD meter

(SINAD Meter) A device used to measure the ratio SND/ND using a band-reject filter.

1.4.12. Switching range

(switching range (sr))developmentThe maximum frequency range, as specified by the manufacturer, over which the receiver or transmitter can operate within a tuning range without reprogramming or retuning. dBc

Decibel relative to carrier power

2.1.3. Other conditions

2.1.4. Interpretation of measurement results

Chapter 2. TECHNICAL PROVISIONS

The frequency of the test power supply for AC mains power shall be from 49 Hz to 51 Hz.êb. Lead-Acid Battery Power Supply Used on Vehicles

2.2. Requirements for transmitters

Lead-Acid Battery Power Supply Used on Vehicles

If a device has optional features that do not affect the RF parameters, measurements only need to be performed on the device configured with the most complex feature combination.

Where possible, the device under test must provide a 50 Ω connection for RF power level measurements.

In cases where the device does not have a fixed 50 Ω connection, a second sample of the device with a temporary antenna connector may be used for easier testing. No modified samples shall be used for radiation measurements.

The specifications of the device under test must represent those of the corresponding product sample.

NOTE: See specific guidance in ETSI EN 300 793.

2.2.1. Frequency error

2.1.2.1. Normal and limit measurement conditions

Measurements are typically conducted under normal conditions and, when required, also under limit conditions.

2.1.2.2. Power supply°

During testing, the power supply to the device must be replaced with a test power supply capable of providing both normal and limit voltages as specified in 2.1.2.3.2 and 2.1.2.4.2. The internal resistance of the test power supply must be sufficiently low to not affect the test results. For testing purposes, the voltage of the power supply will be measured at the device's input.

For devices using battery power, the battery source must be disconnected and the test power supply provided must match the battery voltage of the device.

During testing, the power supply voltage must be maintained within a tolerance of less than ±1 % of the initial measurement voltage. This tolerance is critical for power measurements, with smaller tolerances leading to better measurement uncertainty values.

2.1.2.3. Normal measurement conditions

2.1.2.3.1. Normal temperature and humidity rime Minister cm bình thường

To conduct testing, normal humidity and temperature conditions will be any value within the following range:

• Temperature: from +15 °C to +35 °C;

• Relative humidity: from 20 % to 75 %.

When it is not possible to perform measurements under these conditions, note the ambient temperature and relative humidity during the tests and record them in the test report.

2.1.2.3.2. Normal power supply conditions

a. Grid voltage

The normal test voltage for devices connected to the grid power supply will be the nominal grid voltage. For the purposes of this Standard, the nominal voltage must be the voltage published for the device.

The frequency of the test power supply must correspond to the grid AC frequency and must be between 49 Hz and 51 Hz.

b. Lead-acid battery power supply used on transport vehicles

When radio equipment is designed to operate with common lead-acid batteries used on transport vehicles, the normal test voltage will be 1.1 times the rated battery voltage. For rated voltages of 6 V and 12 V, the corresponding normal test voltages will be 6.6 V and 13.2 V.

c. Other power sources

To use other types of power sources or batteries (primary or secondary), the normal test voltage must comply with the voltage published by the equipment manufacturer.

2.1.2.4. Limit testing conditions

2.1.2.4.1. Temperature limit

For limit tests at temperature extremes, the measurements must be carried out according to the procedures described in Section 2.1.2.5 at temperatures higher and lower than the following ranges:

• From -20 °C to +55 °C.

All mobile and handheld devices.

Base stations for outdoor/uncontrolled climate conditions.

• From 0 °C to +40 °C.

Base stations for indoor/controlled climate conditions.

In the case of base station equipment, the supplier must declare the conditions under which the equipment is intended to be installed.

2.1.2.4.2. Power source voltage limit testing

a. Grid voltage

The limit test voltage for equipment connected to mains AC power supply will be the nominal grid voltage ±10%.

b. Lead-acid battery power supply used on transport vehicles

When equipment is designed to operate with common lead-acid batteries used on transport vehicles, the limit test voltage will be 1.3 and 0.9 times the rated battery voltage. For a rated voltage of 6 V, the corresponding limit test voltages will be 7.8 V and 5.4 V, and for a rated voltage of 12 V, the corresponding limit test voltages will be 15.6 V and 10.8 V.

c. Power sources using other types of batteries

The lower limit test voltages for equipment powered by the following batteries will be:

• For lithium or Leclanché type batteries: 0.85 times the rated battery voltage;

• For nickel-cadmium or mercury type batteries: 0.9 times the rated battery voltage.

Upper limit test voltages shall not be applied.

In cases where upper limit test voltages of the rated voltage are not applied, the following four limit test conditions shall be used:

• V_{Maximum Downhill Gradient}/T_{Maximum Downhill Gradient}for each specific service package in the service provision contract between the ISP and the customer._{Maximum Downhill Gradient}/T_max

• (V_max= rated voltage)/T_{Maximum Downhill Gradient}, (V_maxx= rated voltage)/T_maxx

d. Other power sources

For equipment using other power sources or capable of operating with different voltages, the appropriate limit test voltages will be published by the equipment manufacturer or agreed upon between the equipment manufacturer and the testing organization. These values will be recorded in the test report.

2.1.2.5. Procedures for testing at extreme temperatures

Before conducting the measurement, the equipment must reach thermal equilibrium in the test room. The equipment must be turned off during the temperature stabilization period.

If the equipment has a continuous operation temperature stabilization circuit, these circuits must be activated for 15 minutes after achieving thermal equilibrium and then the equipment must meet the specified requirements. For such equipment, the equipment manufacturer must provide an independent oscillator power supply circuit that is separate from the power supply to the rest of the equipment.

If thermal equilibrium cannot be verified through measurements, the temperature stabilization time must be at least 1 hour or longer as determined by the testing organization.

The measurement procedure must be selected and the humidity of the test room adjusted so that condensation does not occur.

2.1.2.5.1. Measurement procedures for continuously operating equipment

If the manufacturer declares that the equipment is designed for continuous operation, the measurement procedure must be as follows:

• Prior to measuring at high temperature limits, the equipment must be placed in the test room until it reaches thermal equilibrium. Then activate the equipment in transmit mode for 0.5 hours, after this time the equipment must meet the specified requirements.

• Prior to measuring at low temperature limits, the equipment must be placed in the test room until it reaches thermal equilibrium, then switch to standby or receive mode for 1 minute, after this time the equipment must meet the specified requirements.

2.1.2.5.2. Measurement procedures for non-continuously operating equipment Number of employees and workers directly involved in the joint venture and association activities of the organization over the last 03 yearsIf the manufacturer declares that the equipment is designed for intermittent operation, the measurement procedure must be as follows:

• Prior to measuring at high temperature limits, the equipment must be placed in the test room until it reaches thermal equilibrium. Then activate the equipment in transmit mode for 1 minute, followed by 4 minutes in receive mode, after this time the equipment must meet the specified requirements.

• Prior to measuring at extreme temperatures, the device must be placed in the test room until thermal equilibrium is reached. Then, turn on the device in transmit mode for 1 minute, followed by 4 minutes in receive mode. After this time, the device must meet the specified requirements.

• Prior to measuring at low temperature limits, the equipment must be placed in the test room until it reaches thermal equilibrium, then switch to standby or receive mode for 1 minute, after this time the equipment must meet the specified requirements.

2.2.2. Effective radiated power

2.1.3.1. Test signals

Test modulated signals are carrier frequency band signals used for modulation or signal generators. They depend on the type of equipment being tested and the specific test being performed.

Test modulated signals are:

• A-M1: 1,000 Hz frequency at a level causing a 12% channel spacing deviation.

• A-M2: 1,250 Hz frequency at a level causing a 12% channel spacing deviation.

• A-M3: 400 Hz frequency at a level causing a 12% channel spacing deviation. This signal is used as an unwanted signal.

For normal test modulation, the modulation frequency must be 1 kHz and the resulting frequency deviation must equal 60% of the maximum allowable frequency deviation in Clause 2.2.3.2.

Test signals must not have amplitude modulation.

Test signal sources at receiver inputs must be connected in such a way that the source impedance presented to the receiver input is 50 Ω (non-compliant, Clause 2.1.3.2).

This requirement must be met regardless of whether one or multiple signals are simultaneously applied to the receiver via a combined network.

Test signal levels at receiver inputs (RF connectors) must be expressed as emf.

The effects of cross-modulation interference and interference generated in test signal sources will be insignificant.

2.1.3.2. ADummy antenna

A dummy antenna is a non-radiating 50 Ω resistor load connected to the end of the test coupler when testing transmitter equipment requiring a test coupler.

2.1.3.3. Measurement positions and general layout for radiation measurements Administrative Procedure: Recognition of forest tree planting seed sources Appendix A describes the measurement positions for radiation testing. This appendix also details the radiation measurement layout.

2.1.3.4. Arrangement of test signals at the transmitter input

2.1.3.4. Arrangement of measurement signals at the transmitter inputNo. v. When using the measurement setup as shown in Figure 4, the substitute antenna replaces the transmitter antenna at the same position and with the same vertical polarization. Adjust the signal generator frequency to the carrier frequency of the transmitter. If necessary, adjust the test antenna up or down to ensure maximum signal reception.

For the purposes of this Standard, the low-frequency modulated signal from the transmitter will be fed to the microphone inputs with the internal microphone disconnected unless otherwise specified.

2.1.3.5. Attenuation Measurement

2.1.3.5.1. DefinitioncouncillORS||| Definition

The attenuation measurement is a test performed on the receiver to determine the quality degradation of the receiver due to the presence of one or more unwanted signals (noise). For such measurements, the desired signal level must be adjusted to the limit of the average available sensitivity.

Attenuation measurements are divided into two types:

a) Measurements conducted at appropriate test positions (as per Section 2.3.4, Section 2.3.6, and Section A.1).

b) Measurements conducted using a combiner (as per Section 2.3.2, Section 2.3.3, Section 2.3.5, and Section A.4).

Only a combiner should be used for tests where the frequency difference between the desired and undesired test signals is very small compared to the actual frequency, thus causing equal insertion loss for both the desired and undesired signals in the combiner.

2.1.3.5.2. Procedure when Using a Combiner

Connect the combiner to the signal generator through a coupling circuit to create the desired and undesired test signals at the receiver placed within the combiner. Therefore, it is necessary to set the output level of the desired test signal from the signal generator to produce a signal at the receiver (placed within the combiner) corresponding to the average available sensitivity (radiation) determined in Section 2.3.1.2.

Subsequently, this output level of the desired test signal from the signal generator is used for all measurements on receivers using a combiner.

The method for determining the output test level of the signal generator is as follows:

a) Measure the actual average available sensitivity of the receiver as per Section 2.3.1.3.1 step ix), expressed in field strength;

b) Record the difference between the average available sensitivity limit defined in Section 2.3.1.2 and the actual average available sensitivity above, expressed in dB;

c) Then place the receiver in the combiner:

- Connect the signal generator producing the desired signal to the combiner through a coupling circuit. All other ports of the coupling circuit are terminated with a 50 Ω load;

- Adjust the output level of the signal generator with normal test modulation A-M1 (see Section 2.1.3.1) to obtain a SINAD ratio of 20 dB (with voice noise filter). Then increase this output level by an amount corresponding to the difference, expressed in dB as per Section 2.1.3.5.2 step ii);

- For each type of equipment used, the output level of the signal generator is determined equivalent to the average available sensitivity limit for that equipment, expressed in field strength (see Section 2.3.1.2).

2.1.3.5.3. Procedure when Using Test Positions"b) In addition to the lists of public services issued according to the provisions of Clause 2, Article 4 of this Decree, specialized agencies under provincial People's Committees shall report to the provincial People's Committee for decision-making on amending, supplementing, or issuing the list of public services funded by the state budget within their jurisdiction and consistent with the local budget capacity within the approved budget by the Provincial People's Assembly, and send it to the Ministry of Finance and relevant ministries and sectors for supervision during implementation." Technology and Environment on the establishment of the Journal of Standards

When the measurement is conducted at appropriate test positions, the desired and undesired signals are calibrated in dBµV/m at the location of the equipment under test.

For measurements according to Sections 2.3.4, 2.3.6, and A.2, the height of the test antenna and orientation (angle) of the equipment under test must be recorded as per Section 2.3.1.3.1 step x) (reference orientation).

2.1.3.6. Receiver Mute Circuit

If the receiver has a mute circuit, this circuit will not operate during the testing period.

2.1.3.7. Observed Low-Frequency Output Power of the Receiver

The observed low-frequency output power is the maximum power published by the manufacturer and it complies with all requirements in this Standard. With normal test modulation, the low-frequency output power will be measured using a resistive load simulating the load that the receiver operates under normal conditions. The value of this load will be specified by the equipment manufacturer.

2.2.3. Maximum allowable frequency deviation

Interpret the results recorded in the test report for the measurements presented in this Standard as follows:

- Compare the measured values with the corresponding limits to determine whether the equipment meets the parameter requirements in this Standard;

- The measurement uncertainty value for each measured parameter must be recorded in the test report;

- The measurement uncertainty value (for each measurement) must be equal to or lower than the values in Table 2.

For the measurement methods in this Standard, calculating the measurement uncertainty values with the corresponding coverage factor is k = 1.96 or k = 2 (these coverage factors correspond to a confidence level of 95% and 95.45%, respectively, assuming the distribution of actual measurement uncertainties is Gaussian distribution (Gaussian)). Calculating the measurement uncertainty values is in accordance with ETSI TR 100 028, Part 1 and 2, specifically Appendix 6 of ETSI TR 100 028-2.

Table 2 is based on these expansion factors.

Table 2 - Absolute Measurement Uncertainty: Maximum Values

2.2.4. Adjacent channel and interleaved channel power

2.2.5. Spurious emissions

2.2.1.1. Definitions

The carrier frequency error of the transmitter is the difference between the unmodulated carrier frequency measured and the nominal frequency of the transmitter.

2.2.1.2. Limits

Under normal or extreme conditions, the carrier frequency error shall not exceed the values given in Table 3.

Table 3 - Carrier Frequency Error Frequency number

2.2.1.3. Measurement Method

Figure 2 - Diagram for measuring carrier frequency error

Place the device under test in the combiner (Section A.4), set up the measurement diagram as shown in Figure 2.

Measure the carrier frequency before modulation.

Perform the measurement under normal test conditions (see Section 2.1.2.3) and extreme test conditions (apply simultaneously Section 2.1.2.4.1 and Section 2.1.2.4.2).

2.2.6. Transmitter voice operation

2.2.2.1. Definition

The maximum effective radiated power is the effective radiated power in the direction of the maximum field strength at specific measurement conditions before modulation.

The declared maximum effective radiated power is the maximum effective radiated power published by the equipment manufacturer.

The average effective radiated power is the average value of the effective radiated power measured at eight directions.

The declared average effective radiated power is also published by the equipment manufacturer.

2.2.2.2. Limitations

The maximum effective radiated power under normal measurement conditions will be within range d_f from the declared maximum effective radiated power.

The average effective radiated power under normal measurement conditions will also be within range d_f from the declared average effective radiated power.

The characteristic error of the equipment (±1.5 dB), combined with the actual measurement uncertainty to calculate d_f as follows:

For coal-fired thermal power plants where the enterprise holds 100% of the registered capital and uses 100% of its own capital to invest in the project approved by the competent authority, E is determined as 100%;_f² = d_{Granite, gabbro, decorative stone...}² + d_{Average loan repayment period is 10 years;}²

Where:

For coal-fired thermal power plants where the enterprise holds 100% of the registered capital and uses 100% of its own capital to invest in the project approved by the competent authority, E is determined as 100%;_{Granite, gabbro, decorative stone...} is the actual measurement uncertainty;

For coal-fired thermal power plants where the enterprise holds 100% of the registered capital and uses 100% of its own capital to invest in the project approved by the competent authority, E is determined as 100%;_{Average loan repayment period is 10 years;} is the permissible equipment error (±1.5 dB);

For coal-fired thermal power plants where the enterprise holds 100% of the registered capital and uses 100% of its own capital to invest in the project approved by the competent authority, E is determined as 100%;_f is the total error;

All values must be expressed in linear form.

Power variations due to temperature and voltage changes during measurements at limit conditions will fall within the range from -3 dB to +2 dB (measurements performed using a test set).

In all cases, the actual measurement uncertainty must comply with Section 2.1.4.

Furthermore, the maximum effective radiated power must not exceed the maximum value specified by the regulator.

Example calculation of d_f:

• d_{Granite, gabbro, decorative stone...} = 6 dB (acceptable value as provided in the table of maximum measurement uncertainty parameters);

= 3.98 in linear form;

• d_{Average loan repayment period is 10 years;} = 1.5 dB (fixed value for all measuring equipment);

= 1.41 in linear form;

• d_f² = [3,98]² + [1,41]²;

Therefore, d_f = 4.22 in linear form, or 6.25 dB.

This calculation shows that in this case, d_f exceeds 0.25 dB compared to d_{Granite, gabbro, decorative stone...} is the actual measurement uncertainty (6 dB).

2.2.2.3. Measurement Method

Measurements must be conducted under both normal measurement conditions (see 2.1.2.3) and limit measurement conditions (applying simultaneously 2.1.2.4.1 and 2.1.2.4.2).

2.2.2.3.1. Maximum Effective Radiated Power Under Normal Measurement Conditions° Conditions

1- Transmitter to be tested

2- Test antenna

3- Spectrum analyzer or frequency-selective voltmeter (receiver)

Figure 3 - Test setup under normal measurement conditions. The measurement position, selected from Appendix A, must meet the frequency band requirements of the measurement. Arrange the test setup as shown in Figure 3. The initial orientation of the test antenna is vertical polarization unless otherwise indicated.o Place the transmitter to be tested at the standard position and turn it on in the unmodulated mode.developmentm bình thường

ii. Adjust the receiver to the carrier frequency of the transmitter. Adjust the test antenna up or down within the specified height range until the receiver receives the maximum signal level.

iii. Rotate the transmitter 360° around its vertical axis until the direction with the maximum signal level is found.

iv. Adjust the test antenna up or down again within the specified height range until the new maximum level is received. Record this level (this maximum level may be lower than the value achievable outside the specified height range).

It may not be necessary to adjust the test antenna up or down if the measurement is performed in a non-reflective test room (Section A.1.1).

1 - Signal generator

2 - Replacement antenna

3 - Test antenna

4 - Spectrum analyzer or frequency-selective voltmeter (receiver)

Figure 4 - Test setup using replacement antenna

v. When using the setup as shown in Figure 4, the replacement antenna will replace the transmitter's antenna at the same position and with the same vertical polarization. Adjust the signal generator frequency to the carrier frequency of the transmitter. If necessary, adjust the test antenna up or down to ensure the maximum signal level is still received.

for maximum reception

n 3 KHz

2 - Replacement antenna

Adjust the antenna signal level of the substitute antenna until the receiver measures a level equivalent to that of the transmitter or a level corresponding to a predetermined correlation.

The maximum carrier wave radiation power is equivalent to the transmission power of the signal generator, which needs to be adjusted for the gain of the substitute antenna and the loss due to the cable between the signal generator and the substitute antenna.

vi. Repeat steps from ii) to v) above if the measurement antenna and the substitute antenna are oriented horizontally polarized.

2.2.2.3.2. Average effective radiated power under normal measurement conditions

i. Repeat the procedures from step ii) to vi) as seen in 2.2.2.3.1 except for step iii), the transmitter will be rotated through 8 positions, each separated by 45°, starting at the position corresponding to the maximum effective radiated power.

ii. The average effective radiated power corresponds to the 8 measured values calculated as follows:

Average effective radiated power =

Where P_n is the power measured at the corresponding positions.

2.2.2.3.3. Maximum average effective radiated powerto under extreme measurement conditionsớWater, Ice

Hì5 - Measurement diagram under extreme measurement conditions

i. Perform the measurement procedure similar to 2.2.2.3.1 but under extreme measurement conditions. Since it is not possible to repeat the measurement at the measurement position under extreme temperature conditions, relative measurements are performed using the measurement set (section A.4) and the measurement diagram as shown in Figure 5.

ii. Measure the transmitted power to the measurement load both under normal measurement conditions (see 2.1.2.3) and under extreme measurement conditions (apply simultaneously 2.1.2.4.1 and 2.1.2.4.2), note the power difference, expressed in dB. This difference is algebraically added to the average effective radiated power under normal measurement conditions to calculate the average effective radiated power under extreme measurement conditions.

iii. Similarly, the maximum average effective radiated power can be calculated.

iv. Under extreme measurement conditions, the calibration of the measurement set may introduce additional uncertainty in the measurement.

2.2.7. Maximum transmission time

2.2.3.1. Definition

The maximum frequency deviation is the difference between the instantaneous frequency of the modulated radio frequency signal and the unmodulated carrier frequency.

For equipment supporting continuous signaling systems such as CTCSS and DCS, the frequency deviation is the total deviation caused by voice modulation and the signaling system.

The maximum allowable frequency deviation is the maximum value of the frequency deviation specified for the corresponding channel spacing.

2.2.3.2. Limits

2.2.3.2.1. Maximum allowable frequency deviation

The maximum allowable frequency deviation for modulated frequencies from the lowest frequency (f₁) emitted by the equipment (as published by the equipment manufacturer) to (f₂) is provided in Table 4.

NOTE: f₂ equals 3 kHz for equipment with a channel spacing of 25 kHz, or 2.55 kHz for equipment with a channel spacing of 12.5 kHz.

Table 4 - Maximum allowable frequency deviationNo. The adjacent channel power must be at least 60.0 dB lower than the carrier power of the transmitter, and the adjacent channel power does not need to be less than 0.2 µW.

2.2.3.2.2. Transmitter response to high modulation frequenciesNo.i with modulation frequencies greater than 3 kHzo"To improve measurement accuracy, sensitivity, and efficiency, the resolution bandwidth may differ from the reference bandwidth. When the resolution bandwidth is smaller than the reference bandwidth, the result is the integral of the reference bandwidth. When the resolution bandwidth is larger than the reference bandwidth, the result for wideband emission must be normalized with the bandwidth ratio. For discrete stimulation, normalization is not applied, while integration of the reference bandwidth can still be applied" (quoted from CEPT / ERC / REC 74-01, recommendation 4, page 5).

The frequency deviation at modulation frequencies between 3.0 kHz (for equipment with a channel spacing of 25 kHz) or 2.55 kHz (for equipment with a channel spacing of 12.5 kHz) and 6.0 kHz must not exceed the frequency deviation at the 3.0 kHz/2.55 kHz modulation frequency. At a modulation frequency of 6 kHz, the frequency deviation must not be more than 30% of the maximum allowable frequency deviation.

The frequency deviation at modulation frequencies between 6.0 kHz and the frequency equal to the channel spacing used by the equipment must not exceed the value represented by the linear curve showing the frequency deviation (dB) relative to the modulation frequency, starting at the limit frequency of 6 kHz and having a slope of -14 dB/octave.

These limits are illustrated in Figure 6.

Where:

f₁ Lowest frequency;

f₂ 3.0 kHz (for a channel spacing of 25 kHz), or

2.55 kHz (for a channel spacing of 12.5 kHz);

A Frequency deviation measured at f₂;

F_cs Frequency equal to the channel spacing.

Figure 6 - Frequency deviation

2.2.3.3. Measurement method

Figure 7 - Measurement diagram for maximum frequency deviation đPlace the transmitter in the measurement set (section A.4) and arrange the measurement diagram as shown in Figure 7. Measure the frequency deviation using a frequency deviation meter capable of measuring the maximum allowable frequency deviation, including deviations caused by harmonics and cross-modulation components that may occur in the transmitter. The bandwidth of the frequency deviation meter must be sufficiently wide to accommodate the highest modulation frequencies and achieve the required dynamic range.

The transmitter must operate under normal measurement conditions, section 2.1.2.3.

2.2.3.3.1. Maximum allowable frequency deviation

i. Change the modulation frequency from the lowest frequency considered appropriate to f

(see Note). The level of this test signal must be higher than 20 dB compared to the normal modulation frequency test level (see 2.1.3.1).₂ ii. The maximum frequency deviation (positive or negative) must be measured using a frequency deviation meter.

iii. For equipment supporting continuous signaling systems (e.g., CTCSS and DCS), repeat steps from i) to ii) for each signaling system supported by the equipment.

NOTE: f₂ equals 3 kHz for equipment with a channel spacing of 25 kHz, or 2.55 kHz for equipment with a channel spacing of 12.5 kHz.

The supplier will select and record the tone or code used by each signaling system during the testing process, only measuring with one tone or code for each signaling system.

2.2.3.3.2. Transmitter response to modulation frequencies greater than 3 kHz

i. Change the modulation frequency from f

(see Note) to the frequency equal to the equipment's channel spacing. The level of this signal is equal to the level corresponding to a 12% modulation of the channel spacing at 1000 Hz.₂ Adjacent channel power is a portion of the total output power of the transmitter under specific modulation conditions that falls within the defined bandwidth centered on the nominal frequency of one of the two adjacent channels. This power is the average power generated by modulation, noise, and distortion of the transmitter.

iii. For equipment supporting continuous signaling systems (e.g., CTCSS and DCS), repeat steps from i) to ii) for each signaling system supported by the equipment.

NOTE: f₂ equals 3 kHz for equipment with a channel spacing of 25 kHz, or 2.55 kHz for equipment with a channel spacing of 12.5 kHz.

2.3. Requirements for receivers

2.2.4.1. Definition

Interference channel power is a portion of the total output power of the transmitter under specific modulation conditions that falls within the defined bandwidth centered on the nominal frequency of one of the two interference channels. This power is the average power generated by modulation, noise, and distortion of the transmitter.

2.2.4.2. Limits

The adjacent channel power must be at least 60.0 dB below the carrier power of the transmitter, and the adjacent channel power does not need to be less than 0.2 µW.

3 - Receiver under test

The intermodulation power must be less than the carrier power of the transmitter by at least 70.0 dB, and the intermodulation power does not need to be less than 0.2 µW.

2.2.4.3. Measurement Method

The adjacent channel power and intermodulation power are measured using a power meter or spectrum analyzer, in accordance with the requirements set out in Section B.2.

Figure 8 - Diagram for Measuring Adjacent Channel Power and Intermodulation Power

i. Place the transmitter under test in the measurement setup (as per A.4) and connect as shown in Figure 8. The level at the input of the receiver/spectrum analyzer must be within the allowable limits. The transmitter must operate at maximum carrier power.

ii. When the unmodulated signal from the transmitter is present, adjust the power meter to obtain the maximum response. This is the 0 dB reference point. Note the setting value of the attenuator of the power meter.

iii. Adjust the power meter off the carrier frequency to obtain a -6 dB response at the closest frequency to the carrier frequency of the transmitter, which is the offset frequency from the nominal carrier frequency as given in Table 5.

Table 5 - Frequency OffsetNo.

If the equipment has been accurately calibrated, it is only necessary to adjust the power meter (point D2 in the filter diagram of the power meter in Appendix B) to the nominal frequency of the adjacent channel to achieve similar results.

iv. The transmitter signal must be modulated with a 1250 Hz tone and have a level 20 dB higher than the required level to produce 60% of the maximum allowed deviation (see 2.2.3.3.1).

v. Adjust the variable attenuator of the power meter to obtain the same power reading as in step ii). Note this value.

vi. The ratio between the adjacent channel power and the carrier power is the difference between the attenuator settings in steps ii) and v).

The absolute value of the adjacent channel power can be calculated from this ratio and the carrier power of the transmitter.

Record the adjacent channel power for each adjacent channel.

vii. Repeat steps iii) to vi) with the power meter adjusted to the other side of the carrier frequency.

viii. The adjacent channel power of the device under test is the highest value recorded in step vi) for the upper and lower adjacent channels.

ix. Repeat steps iii) to vi) for the intermodulation channel with the values in Table 6.

Bn lTable 6 - Frequency OffsetdevelopmentFrequency Offset

x. The intermodulation power of the device under test is the highest value recorded in step vi) for the upper and lower intermodulation channels.

xi. For devices supporting continuous signaling systems (e.g., CTCSS and DCS), repeat steps iii) to x) for each signaling system supported by the device, and record the tone or code used by each signaling system throughout the testing process as selected by the manufacturer.

NOTE: Additionally, if a spectrum analyzer according to Section B.2 is used and the rms adjacent channel and intermodulation powers are measured directly, then the adjacent channel power (in dB) can be measured directly. The analyzer should use a measurement method without frequency weighting and without acceleration. The adjacent channel power ratio will be smaller than the measured result.

2.3.1. Average available sensitivity (field strength, voice)

2.2.5.1. Definition

Spurious emissions are emissions from the antenna and housing of the transmitter radiating at frequencies other than the carrier frequency and normal modulation sidebands.

2.2.5.2. Limits

The power of any spurious emission shall not exceed the values given in Table 7a.

Table 7a - Spurious Emissions

The reference bandwidths used for measurement are presented in Tables 7b and 7c.

Table 7b - Reference Bandwidths for Spurious Emission MeasurementsamendReference Bandwidths for Spurious Emission Measurements

Bn lTable 7c - Reference Bandwidths for Desired Emissions (for Equipment Operating Below 1 GHz)export, Carrier Frequency Offset

3- High Q Filter or High Pass Filter

1- Transmitter to be tested

2- Test antenna

4- Spectrum Analyzer or Selective Voltmeter (Receiver)

Figure 9 - Diagram for Measuring Spurious Emissions

Follow the measurement diagram as shown in Figure 9:

i. At the measurement location (meeting the requirements of Appendix A), the test sample is placed at a specified height on a stand.

ii. The transmitter must operate at the transmission power as determined in 2.2.2 for the connected antenna.

iii. If possible, the measurement must be performed with the transmitter without modulation. If this cannot be done, it must be modulated with an appropriate test signal (see 2.1.3.1).

The transmitter must be set to continuous transmission mode. If this cannot be done, it must be noted in the measurement report and it must be ensured that all spurious emissions are detected and measured correctly.

The resolution bandwidth of the measuring instrument is the smallest bandwidth that is still larger than the width of the component being measured. This must be taken into account when the next maximum bandwidth causes the amplitude to increase by less than 1 dB.

In general, the resolution bandwidth of the receiver must equal the reference bandwidth.

"To improve measurement accuracy, sensitivity, and efficiency, the resolution bandwidth may differ from the reference bandwidth. When the resolution bandwidth is smaller than the reference bandwidth, the result is the integral of the reference bandwidth. When the resolution bandwidth is larger than the reference bandwidth, the result for wideband spurious emissions must be normalized with the bandwidth ratio. For discrete stimulation, normalization is not applied, while the integration of the reference bandwidth can still be applied" (quoted from CEPT / ERC / REC 74-01, Recommendation 4, page 5).

4 - Test antenna

The conditions related to the measurements must be recorded in the measurement report.

iv. The measuring receiver must measure any spurious components within the frequency range from 30 MHz to 4 GHz. For devices operating at frequencies above 470 MHz, measurements must be performed within the frequency range from 4 GHz to 12.75 GHz if spurious emissions are detected within 10 dB of the specified limit between 1.5 GHz and 4 GHz.

v. At each frequency where spurious components are found, rotate the sample until maximum response is obtained and the effective radiated power of the spurious component is determined by substitution measurement using the setup shown in Figure 10.

vi. Record the value of the effective radiated power of that spurious component.

vii. Repeat the measurement with the measuring antenna in the orthogonal polarization plane.

viii. Repeat the measurement with the transmitter in the "standby" state.

3 - Test antenna

4 - Spectrum analyzer or frequency-selective voltmeter (receiver)

Figure 4 - Test setup using replacement antenna

v. When using the setup as shown in Figure 4, the replacement antenna will replace the transmitter's antenna at the same position and with the same vertical polarization. Adjust the signal generator frequency to the carrier frequency of the transmitter. If necessary, adjust the test antenna up or down to ensure the maximum signal level is still received.

Figure 10 - Setup for measuring spurious emissions using a substitute antenna

2.2.6. Operationinternational of the transmitter

Customer assistance service is a service that provides answers to inquiries, advice, guidance on using the service, accepts requests, and provides information to customers about IPTV services on the fixed terrestrial telecommunications network.

Voice Operated Xmit (VOX) operation is when the transmitter is activated by an audio signal such as speech.

2.2.6.2. Limits

This requirement applies only to PMR446 equipment without Push-to-Talk (PTT) functionality.

The VOX power ratio shall not exceed -70 dB.

NOTE: -82 dB is acceptable, but -69 dB does not meet the requirement.

2.2.6.3. Measurement Method

See Figure 8 for the measurement setup.

Conduct the measurement:

i. The transmitter under test shall be placed in the test fixture (section A.4) using an audio coupler for modulation. When the modulating source is off, record the output power of the transmitter.

ii. Activate the modulating source at the level specified by the manufacturer and record the output power of the transmitter.

iii. Turn off the modulating source and record the output power of the transmitter.

iv. The VOX power ratio is the larger value calculated from:

- The power measured in step i) minus the power measured in step ii);

- The power measured in step iii) minus the power measured in step ii).

NOTE: The power measured in steps i) and iii) may be very small, so it need not be measured if it is lower than 80 dB below the level measured in step ii). For example, if the background noise level of the measuring equipment is -75 dBm, then the minimum measurable power in step ii) is 5 dBm; continuing this example, if the power measured in steps i) and iii) is -75 dBm and the power measured in step ii) is 7 dBm, then the VOX power ratio is -75 dBm - (7 dBm) = -82 dB.

2.3.3. Adjacent channel selectivity

2.2.7.1. Definition

The maximum transmission time is the total transmission time following activation of the Push-To-Talk (PTT) control or Voice Operated Xmit (VOX) or any other mechanism.

2.2.7.2. Limits

The maximum transmission time must be less than 180 seconds.

This requirement applies only to PMR446 equipment with Push-To-Talk (PTT) capability that can be locked in the "on" position or without PTT functionality.

2.2.7.3. Measurement Method

See Figure 8 for the measurement setup.

Conduct the measurement:

i. Activate the transmitter under test;

ii. Observe the output power;

iii. The time period from the start of transmission to the end of the transmission process must be recorded.

NOTE 1: Transmission begins when the measured power increases from a minimum of 70 dB below the level measured in section 2.2.2 to below 3 dB below the level measured in section 2.2.2.

NOTE 2: Transmission ends when the measured power has decreased by at least 70 dB from the level measured in section 2.2.2.

2.3.4. Spurious response rejection

2.3.5. Intermodulation response rejection

2.3.1.1. Definition

Average Usable Sensitivity is expressed as the average field strength in units of dBµV/m generated by the carrier wave at the designated frequency of the receiver when modulated with a normal test signal (see 2.1.3.1). This signal, excluding noise, after demodulation produces a SINAD ratio of 20 dB and is measured through a voice noise filter circuit. The average here is calculated from eight field strength measurements when the receiver is rotated incrementally by 45° angles starting from some direction.

NOTE: Average Usable Sensitivity differs very little from Maximum Usable Sensitivity when measured in a single direction due to the averaging process as described in 2.3.1.3.1 vii). For example, the error cannot exceed 1.2 dB if the sensitivity in seven directions is equivalent and in the eighth direction is very poor. For this reason, the starting direction (or angle) can be chosen randomly,

2.3.1.2. Limits

For limits on average usable sensitivity, there are four types of equipment defined as follows:

Type A: Equipment with an integral antenna enclosed within the housing.

Type B: Equipment with an integral antenna fixed or extendable up to 20 cm from the housing.

Type C: Equipment with an integral antenna fixed or extendable beyond 20 cm from the housing.

Type D: Equipment not falling into Types A, B, or C.

Under normal test conditions, the average usable sensitivity shall not exceed the field strength values listed below.

Table 8a - Limits on sensitivity for Type A and Type D equipmenton Bandwidth (MHz)

For frequencies greater than 375 MHz, the limits must comply with Table 8b. C

For frequencies less than or equal to 375 MHz, subtract a correction factor K from the field strength values in Table 8b.

K = 20 log

[(l + 20)/40]₁₀Where: l is the length of the external part of the antenna in centimeters.

This correction applies only if the length of the external antenna is less than (15,000/f - 20) cm, where f is the frequency in MHz.

For all types of equipment mentioned above, simply add 6 dB to the normal test condition limit values to obtain the limit values for the threshold test condition.₀ 2.3.1.3. Measurement Method₀ 2.3.1.3.1. Measurement Method under Normal Test Conditions

The measurement setup must satisfy the connection of the device under test to the SINAD meter without affecting the radiation field (section A.3.3).

At the measurement location, selected according to Appendix A, place the device on a non-conductive stand at a specified height, near the position most commonly used as published by the equipment manufacturer.

The test antenna must be oriented vertically and the length of the test antenna must be selected based on the receiver's frequency.

1 - SINAD meter or voice noise filter circuit

2 - Audio Frequency load/audio mixer

3 - Device under test

Where:

4 - Test antenna

5 - Signal generator

5 - Signal generator

The unwanted signal generated by signal generator B is modulated with A-M3 signal (see 2.1.3.1). Both input signals have the same frequency as the nominal frequency of the receiver under test.

ii. Initially, turn off signal generator B (unwanted signal) but maintain the output impedance.

Diagram 11 - Schematic for measurement under normal testing conditions

Place the receiver to be tested on the stand at the standard position in a random direction. The distortion factor meter combined with a 1000 Hz band-stop filter (see Appendix C) (or a SINAD meter) is connected to the receiver's output through the voice noise filter and low-frequency load or audio mixer to avoid causing interference to the nearby electronic field (see Diagram 11).

Conduct the measurement:

i. Connect the signal generator to the test antenna:

Adjust the frequency of the signal generator to the rated frequency of the receiver and apply the normally tested A-M1 modulated signal (see Section 2.1.3.1).

ii. Adjust the receiver volume to have at least 50% of the apparent output power, see 2.1.3.7 or if adjusting in steps, adjust to the first step that produces at least 50% of the apparent output power.

Observe the SINAD ratio.

iii. Adjust the level of the signal generator until the SINAD ratio with the voice noise filter is 20 dB.

iv. Raise or lower the test antenna within the specified height range to find the best SINAD ratio with the voice noise filter.

v. Re-adjust the level of the signal generator until the SINAD ratio is 20 dB.

vi. Record the minimum level of the signal generator from step iv).

vii. Repeat steps iii) to vi) for the remaining 7 positions of the receiver spaced at 45° intervals, determine and record the signal level value at the output of the signal generator that produces a SINAD ratio of 20 dB with the voice noise filter.

viii. Maintain the input signal level to the test antenna.

Replace the receiver with a substitute antenna as in Section A.1.5.

The substitute antenna is oriented vertically polarized and the length of the substitute antenna is selected to match the frequency of the receiver.

Connect the substitute antenna to the calibrated receiver.

Adjust the height of the test antenna within the specified height range to ensure maximum signal reception.

Record the measured signal level by the receiver as the field strength in dBµV/m.

Calculate and record 8 values of field strength X_{international} (i = 1,...8), expressed in µV/m corresponding to the aforementioned signal level of the signal generator.

ix. The average sensitivity is represented by the field strength E_avg (dBµV/m), calculated according to the formula:

• Where X_{international} are each of the 8 field strength values determined in step viii.

x. The reference direction is considered to be the direction with the highest sensitivity (that is, corresponding to the lowest recorded field strength during the measurement) among the 8 measurement positions:

• Record the direction, corresponding height (if applicable), and this reference field strength value.

2.3.1.3.2. Measurement Method Under Limit Testing ConditionsdevelopmentUse the measurement setup in Diagram 12 to measure the average sensitivity under limit testing conditions.

Diagram 12 - Schematic for measurement under limit testing conditions

Determine the input level of the test signal that produces a SINAD ratio of 20 dB with the voice noise filter under both normal and limit testing conditions, and calculate the difference in dB. Add this difference to the average sensitivity under normal testing conditions for the radiation fields, expressed in dBµV/m as in 2.3.1.3.1 at step i) to obtain the sensitivity under limit testing conditions.

Conduct the measurement:

2.3.2.1. Definition

2.3.6. Blocking characteristic

Co-channel interference suppression is a measure of the receiver's ability to receive the desired modulated signal without exceeding a given degradation due to the presence of an undesired modulated signal, both signals being at the receiver's rated frequency.

2.3.2.2. Limits

The value of the co-channel interference suppression ratio, expressed in dB, at any frequency of the undesired signal will fall within the range between:

• -8.0 dB and 0 dB: for a channel spacing of 25 kHz;

• -12.0 dB and 0 dB: for a channel spacing of 12.5 kHz.

2.3.2.3. Measurement Method

Diagram 13 - Schematic for measuring co-channel interference suppression

- Conduct the measurement:ồ i. Place the receiver in the measurement setup (Section A.4).

Connect two signal generators A and B to the measurement setup via the combiner circuit.

The desired signal generated by signal generator A has the same frequency as the receiver's rated frequency and is normally tested A-M1 modulated (see 2.1.3.1).

The undesired signal generated by signal generator B is modulated with A-M3 (see 2.1.3.1). Both input signals have the same frequency as the receiver's rated frequency.

ii. Initially, turn off signal generator B (the undesired signal) but maintain the output impedance.

viii. Repeat the measurements from step ii) to step vii) for the test antenna with horizontal polarization.

3.1. Radio equipment subject to regulation under Article 1.1 must comply with the technical regulations set forth in this Standard.

Adjust the desired signal level from signal generator A to be equivalent to the average usable sensitivity limit of the type of equipment being used, expressed in field strength (see 2.3.1.2 and 2.1.3.5).

Adjust the receiver volume so that the output power is at least 50% of the apparent output power (see 2.1.3.7), or if the volume is adjusted in steps, adjust it to the first step that produces at least 50% of the apparent output power.

iii. Turn on signal generator B to produce an undesired signal.

iv. Adjust the undesired signal level from signal generator B until:

- The level of the desired signal decreases by 3 dB, or

- The SINAD ratio at the receiver output drops to 14 dB (with voice noise filter), regardless of which condition occurs first.

v. Record the undesired signal level.

vi. For each frequency of the undesired signal, the adjacent channel interference rejection ratio will be represented as the ratio of the undesired signal level to the desired signal level, expressed in dB.

Record this ratio.

vii. Repeat the measurement for shifting the frequency of the undesired signal by 6% and 12% of the channel spacing.

viii. The adjacent channel interference rejection ratio of the device under test will be the lowest value among the five values recorded in step vi), expressed in dB.

The value of the adjacent channel interference rejection ratio, expressed in dB, is typically a negative number (for example, -12 dB is smaller than -8 dB).

2.3.7. Spurious emissions

2.3.3.1. Definition

Adjacent channel selectivity is a measure of the receiver's ability to receive the desired modulated signal without exceeding a given degradation due to the presence of an undesired signal at a frequency equal to the adjacent channel spacing from the desired signal frequency.

2.3.3.2. Limit

The adjacent channel selectivity of the device under specified test conditions for different channel spacings shall not exceed the undesired signal levels provided in Table 9.

Table 9 - Adjacent channel selectivityt Tn

2.3.3.3. Measurement method

Figure 14 - Diagram for measuring adjacent channel selectivity

Conduct the measurement:

i. Place the receiver in the test setup (section A.4).

Connect signal generators A and B to the test setup through a combiner circuit.

The desired signal generated by signal generator A will have a frequency equal to the nominal frequency of the receiver and will be normally modulated A-M1 (see 2.1.3.1).

The undesired signal generated by signal generator B will be modulated with signal A-M3 (see 2.1.3.1) and will have a frequency equal to the adjacent channel frequency relative to the desired signal.

ii. First, turn off signal generator B (undesired signal) but maintain the output impedance.

Adjust the desired signal level from signal generator A to be equivalent to the limit of the average sensitivity of the type of equipment being used, expressed in field strength (see 2.3.1.2 and 2.1.3.5).

Adjust the receiver volume so that the output power is at least 50% of the apparent output power, see 2.1.3.7, or if the volume is adjusted in steps, adjust it to the first step that produces at least 50% of the apparent output power.

iii. Turn on signal generator B to generate the undesired signal.

iv. Adjust the undesired signal level from signal generator B until:

- The level of the desired signal decreases by 3 dB, or

- The SINAD ratio at the receiver output drops to 14 dB (with voice noise filter), regardless of which condition occurs first.

v. Record the undesired signal level.

vi. For each adjacent channel, the selectivity is represented as the ratio between the undesired signal level and the desired signal level, expressed in dB.

Then convert this unit to the field strength of the undesired signal at the receiver location, expressed in dBµV/m.

Record this value.

vii. Repeat the measurement for the undesired signal at the frequency of the lower adjacent channel of the desired signal.

viii. The adjacent channel selectivity of the device under test is the lower value among the two values obtained in step vi) for the upper and lower adjacent channels closest to the receiving channel.

ix. Repeat the measurement under limit test conditions (apply both 2.1.2.4.1 and 2.1.2.4.2) with the undesired signal level adjusted to be equivalent to the average usable sensitivity limit (under limit test conditions) of the type of equipment being tested, expressed in field strength (see 2.3.1.2 and 2.1.3.5).

Appendix A (Provisions) Field Strength Measurement

2.3.4.1. Definition

Spurious response rejection is the receiver's capability to receive the desired modulated signal without exceeding the specified quality degradation due to the presence of an undesired modulated signal at any other frequency that has a spurious response.

2.3.4.2. Limit

The spurious response rejection of the device must ensure that under specified test conditions, the specified quality degradation does not exceed when the level of the undesired signal reaches:

• 75 dBµV/m: for undesired signals with frequencies ≤ 68 MHz;

• (20 log₁₀(f) + 38.3) dBµV/m: for undesired signals with frequencies > 68 MHz;

Where f is the frequency in MHz.

2.3.4.3. Measurement method

2.3.4.3.1. Introduction to the measurement method

Spurious responses can occur at all frequencies within the frequency spectrum and the requirements of this standard must be met for all frequencies. However, for practical reasons, measurements must be performed as specified in this standard. In particular, this method does not intend to measure all spurious responses but only selects those spurious responses that have a high probability of occurrence. However, in the limited frequency range near the nominal frequency of the receiver, the probability of spurious response cannot be determined, therefore, searching must be conducted in this limited frequency range. This method has a high degree of reliability for devices meeting the requirements at frequencies not measured.

To determine the frequencies where spurious responses may occur, the following calculations must be performed:

i. Calculate the limited frequency range

• "Limited frequency range" is defined as the oscillating signal frequency (f_LO) based on the first mixer of the receiver, plus or minus the intermediate frequency (f_{linternational}...f_ln) and half the preset channel bandwidth (sr) of the receiver.

Therefore, the frequency f_l of the limited frequency range is;

Calculate the frequency outside the long limited frequency range:

• The calculation of frequencies outside the defined band at step i) may result in false responses, which are carried out in the remaining frequency band of the measurement range, see 2.3.4.3.4 iv);

• Frequencies outside the main frequency band are harmonics of the internal oscillation signal frequency f_LO fed into the first mixer of the receiver, added to or subtracted from the first intermediate frequency (f_l1) of the receiver;

Therefore, the frequency of these false responses is:

nf_LO ± f_l1; where n is an integer ≥ 2.

To calculate the frequencies of false responses, it is necessary to first measure the first image response of the receiver.

For the calculations at steps i) and ii) above, the equipment manufacturer must report the receiver frequency, the internal oscillation signal frequency f_L0 fed into the first mixer in the receiver, the intermediate frequency (f_i1...f_{3.2.5. Medical examination and treatment establishments, laboratories, and vaccination centers at the provincial level}), and the frequency band of preset channels (sr) of the receiver.

2.3.4.3.2. Measurement Diagram

1 - SINAD meter and voice noise filter

5 - Signal generator

5 - Signal generator

4 - Broadband measurement antenna

5 - Coupling circuit (used only when using 1 antenna)

6 - Signal generator A

7 - Signal generator B

8 - Measurement antenna for desired signal (see Section 2.3.4.3.2 e))

Figure 15 - False response suppression measurement diagram

Conduct measurements as follows:

i. The measurement position is similar to that used for measuring average sensitivity (see 2.3.1);

The height of the broadband measurement antenna and the direction (angle) of the device under test are set as in 2.3.1.3.1 and 2.1.3.5.

2.3.4.3.3. Survey Method

The survey is conducted as follows, using the diagram in Section 2.3.4.3.2.

i. Connect signal generators A and B to the broadband measurement antenna through the coupling circuit.

The desired signal generated by signal generator A has a frequency equal to the nominal frequency of the receiver and is normally modulated A-M1 (see 2.1.3.1).

The undesired signal generated by signal generator B is modulated with a 400 Hz frequency at a deviation of 5 kHz.

ii. First, turn off signal generator B (undesired signal), but maintain the output impedance.

Adjust the desired signal from signal generator A to the limit of the average sensitivity of the type of device being tested, expressed in field strength, using the calibration procedure in 2.1.3.5.3 (see 2.3.1.3 and 2.1.3.5).

iii. Turn on signal generator B to generate the undesired signal.

Adjust the level of signal generator B to obtain a field strength higher than the false response suppression threshold measured at the receiver input (see 2.3.4.2) by at least 10 dB, even for some measurement positions, the level of the undesired signal varies significantly with frequency due to ground reflection.

Change the frequency of the undesired signal in increments of 10 kHz within the frequency band limit (see 2.3.4.3.1 i)) and in the calculated frequency bands outside this band (see 2.3.4.3.1 ii)).

iv. Observe the SINAD ratio.

v. If the SINAD ratio is greater than 20 dB, the effect of false emission is not detected, and the measurement must continue at the next frequency step.

vi. If the SINAD ratio is less than 20 dB, reduce the level of the undesired signal in 1 dB steps until a SINAD ratio of 20 dB or more is obtained.

vii. In cases where there is floor reflection, the antenna height will be adjusted accordingly with each change in the level of the undesired signal to achieve a SINAD ratio of 20 dB or more.

The measurement antenna does not need adjustment if the measurement position is in a non-reflective room (Section A1.1) or if ground reflection is effectively eliminated.

viii. During the survey, if any false response is detected, record the frequency, position, and antenna height for use in the measurements in Section 2.3.4.3.4.

2.3.4.3.4. Measurement Method

At each frequency where false responses are detected within and outside the frequency band limit, conduct the measurement as follows:

i. Measurement diagram as in 2.3.4.3.3.

Connect signal generators A and B to the broadband measurement antenna through the coupling circuit.

The desired signal generated by signal generator A has a frequency equal to the nominal frequency of the receiver and is normally modulated A-M1 (see 2.1.3.1).

The undesired signal generated by signal generator B is modulated with a 400 Hz frequency with a deviation of 12% of the channel spacing (A-M3).

ii. First, turn off signal generator B (undesired signal), but maintain the output impedance.

Adjust the desired signal level from generator A to the average sensitivity limit (see 2.1.3.5) of the type of equipment under test (see 2.3.1.2), expressed as the field strength at the receiver location.

Adjust the receiver volume so that the output power is at least 50% of the apparent output power, see 2.1.3.7, or if the volume is adjusted in steps, adjust it to the first step that produces at least 50% of the apparent output power.

iii. Turn on signal generator B to generate the undesired signal.

iv. Observe the SINAD ratio.

v. Adjust the undesired signal level until a SINAD ratio of 14 dB is obtained with the voice noise filter.

Note the undesired signal level.

vi. Increase or decrease the frequency of the undesired signal in steps of 20% of the channel spacing and repeat step v) until the lowest level is found.

For each frequency, the spurious response is represented as the dBµV/m level of the undesired signal field strength at the receiver location, corresponding to the lowest value recorded in step v).

Record this value.

vii. Repeat the measurement at all frequencies that detect spurious responses during the survey of the frequency band limits, see 2.3.4.3.1, and remaining spurious frequencies calculated within the frequency range f/3,2 MHz or 30 MHz, higher than 3.2 x f._Rx/3,2 MHz or 30 MHz, higher than 3.2 x f_{General Requirements}, where f_{General Requirements} is the nominal frequency of the receiver, position and antenna height are recorded in 2.3.4.3.3 viii).

viii. The spurious response suppression of the equipment under test is represented as the dBµV/m level of the undesired signal field strength at the receiver location, corresponding to the lowest value recorded in step vi).

Appendix B (Provisions) Technical Specifications for Specific Measurement Schemes

2.3.5.1 Definition

Spurious response suppression is a measure of the receiver's ability to obtain the desired modulated signal without exceeding the specified quality degradation due to the presence of two or more undesired signals having a specific frequency relationship with the desired signal frequency.

2.3.5.2 Limitations

2.3.5.2.1 For low-power devices

The spurious response suppression of low-power devices must ensure that, under specified test conditions, the specified quality degradation does not exceed for levels of undesired signals up to:

• 60 dBµV/m for undesired signals with a frequency ≤ 68 MHz;

• (20 log₁₀(f) + 23.6) dBµV/m for undesired signals with a frequency > 68 MHz.

Where f is the frequency in MHz.

2.3.5.2.2 For other devices

The spurious response suppression of devices that are not low-power devices must ensure that, under specified test conditions, the specified quality degradation does not exceed for levels of undesired signals up to:

• 70 dBµV/m for undesired signals with a frequency ≤ 68 MHz;

• (20 log10(f) + 33.3) dBµV/m for undesired signals with a frequency > 68 MHz.

Where f is the frequency in MHz.

2.3.5.3 Measurement Method

HìFigure 16 - Diagram for measuring spurious response suppression

The measurement procedure is as follows (see Figure 16):

Connect two signal generators A and B to the measurement setup via the combiner circuit.

The desired signal generated by signal generator A has the same frequency as the receiver's rated frequency and is normally tested A-M1 modulated (see 2.1.3.1).

Connect three generators A, B, and C to the test set through a combining network.

The desired signal from generator A has a frequency equal to the nominal frequency of the receiver and is normally modulated A-M1 (see 2.13.1).

The first undesired signal from generator B is unmodulated and adjusted to a frequency 50 kHz higher than the nominal frequency of the receiver.

The second undesired signal from generator C is modulated by A-M3 (see 2.1.3.1) and adjusted to a frequency 100 kHz higher than the nominal frequency of the receiver.

ii. First, turn off generators B and C (undesired signals), but maintain the output impedance.

Adjust the desired signal level from signal generator A to the equivalent of the limit of the average available sensitivity level of the device under test, expressed in field strength (see 2.3.1.3 and 2.1.3.5).

Adjust the volume of the receiver to have at least 50% of the indicated output power, see 2.1.3.7, or if the volume is adjusted in steps, adjust it to the first step that provides at least 50% of the indicated output power.

iii. Turn on signal generators B and C to generate unwanted signals;

iv. Maintain and adjust the levels of these two signals until the unwanted signal causes:

- The level of the desired signal decreases by 3 dB, or

- The SINAD ratio at the receiver output drops to 14 dB (with voice noise filter), regardless of which condition occurs first.

v. Record the levels of the unwanted signals.

vi. For each configuration of the unwanted signals, the intermodulation suppression ratio is represented as a ratio, expressed in dB between the level of the unwanted signal and the level of the desired signal.

Then convert this unit to the field strength of the undesired signal at the receiver location, expressed in dBµV/m.

Record this value.

vii. Repeat the measurement for the unwanted signal from signal generator B with a frequency lower than the desired signal by 50 kHz and the unwanted signal from signal generator C with a frequency lower than the desired signal by 100 kHz.

viii. The intermodulation suppression ratio of the device under test is the lower value of the two recorded values in step vi).

Appendix C (Provisions) Bandstop Filter (for SINAD Meter)

2.3.6.1. Definition

Blocking characteristic is a measure of the receiver's ability to receive the desired modulated signal without exceeding the specified degradation due to the presence of unwanted signals at any frequency other than the adjacent channel frequency or the spurious response frequency.

2.3.6.2. Limitations

The blocking characteristic level at any frequency within the specified range must be:

• ≥ 89 dBµV/m for unwanted signals with frequencies ≤ 68 MHz;

• ≥ (20 log₁₀(f) + 52,3) dBµV/m for unwanted signals with frequencies > 68 MHz.

Where f is the frequency in MHz.

2.3.6.3. Measurement Method

1 - SINAD meter and voice noise filter

5 - Signal generator

5 - Signal generator

4 - Broadband measurement antenna

5 - Combination Circuit

6 - Signal generator A

7 - Signal generator B

Figure 17 - Diagram for measuring blocking characteristics

The measurement position corresponds to the position for measuring the average available sensitivity (see 2.3.1).

The device under test is placed on a stand in the standard position and oriented in a standard direction (see 2.3.1.3.1j)).

Conduct the measurement:

i. Connect signal generators A and B to the broadband measurement antenna through the coupling circuit.

The desired signal generated by signal generator A has a frequency equal to the nominal frequency of the receiver and is normally modulated A-M1 (see 2.1.3.1).

The unwanted signal from signal generator B is unmodulated and has a frequency offset from the receiver's nominal frequency of 1 to 10 MHz.

In practice, measurements are conducted at unwanted signals with frequencies approximately ±1 MHz, ±2 MHz, ±5 MHz, and ±10 MHz, avoiding frequencies where spurious responses occur (see 2.3.4).

ii. First, turn off signal generator B (unwanted signal) (while maintaining the output impedance).

Adjust the desired signal level from signal generator A to the equivalent of the limit of the average available sensitivity level, expressed in field strength (see 2.3.1.2 and 2.1.3.5).

Adjust the volume of the receiver to have at least 50% of the indicated output power, or if the volume is adjusted in steps, adjust it to the first step that provides at least 50% of the indicated output power.

iii. Turn on signal generator B to generate the unwanted signal;

iv. Adjust the level of signal generator B until the unwanted signal causes:

- The level of the desired signal decreases by 3 dB, or

- The SINAD ratio at the receiver output drops to 14 dB (with voice noise filter), regardless of which condition occurs first.

v. Record the levels of the unwanted signals.

vi. For each frequency, the blocking characteristic is represented as the dBµV/m level of the field strength of the unwanted signal at the receiver position.

Record this value.

vii. Repeat the measurement at all remaining frequencies listed in step i).

viii. The blocking characteristic level of the device under test is the field strength of the unwanted signal at the receiver position, expressed in dBµV/m, corresponding to the lowest recorded value in step vi).

2.3.7. Spurious Emissions

2.3.7.1. Definition

Spurious emissions from the transmitter are components radiated at any frequency by the equipment and antenna.

2.3.7.2. Limitations

The power of any spurious emission shall not exceed the values given in Tables 10a and 10b.

Table 10a - Radiated Component

Table 10b - Reference Bandwidth for Measuring Unwanted Emissions đ3. Measurement Method

2.3.7.1 - Receiver Under Test

2 - Test Antenna

3 - Spectrum Analyzer or Selective Voltmeter (Receiver)

Figure 18 - Diagram for Measuring Spurious Emissions

i. Choose the measurement position that meets the requirements of the frequency band specified in the selected measurement from Appendix A.ứThe test antenna is oriented vertically polarized and connected to the receiver with the reference bandwidth as stated in Table 10b.

Conduct the measurement:

ii. Place the receiver under test on a stand in the standard position. Any spurious emission component in the frequency band from 30 MHz to 4 GHz will be detected by the test antenna and the receiver. Additionally, for devices operating above 470 MHz, the measurement must be repeated in the frequency band from 4 GHz to 12.75 GHz.

Record the frequency of each spurious emission component.

iii. At each frequency where a spurious emission component is detected, adjust the receiver and fine-tune the test antenna up or down within the specified height range until the maximum signal level is obtained on the receiver.

Rotate the receiver 360° around the vertical axis until a higher maximum signal level is obtained.

iv. Fine-tune the test antenna again within the specified height range until the maximum signal level is obtained. Record this level.

Figure 19 - Diagram for Measuring Spurious Emissions Using a Substitute Antenna

vi. Using the diagram in Figure 19, substitute the antenna is placed in the position of the test antenna and also has the same vertical polarization. It is connected to the signal generator.

3 - Test antenna

4 - Spectrum analyzer or frequency-selective voltmeter (receiver)

Figure 4 - Test setup using replacement antenna

v. When using the setup as shown in Figure 4, the replacement antenna will replace the transmitter's antenna at the same position and with the same vertical polarization. Adjust the signal generator frequency to the carrier frequency of the transmitter. If necessary, adjust the test antenna up or down to ensure the maximum signal level is still received.

vii. At each frequency where a spurious emission component is detected, adjust the signal generator and the receiver and fine-tune the test antenna up or down within the specified range until the maximum signal level is obtained on the receiver.

Fine-tuning of the test antenna may not be necessary if the measurement is performed in a non-reflective room (section A.1.1).

Record the level of the signal generator that produces the same signal level on the receiver as in step v). This value, after being corrected for the antenna gain and cable loss between the transmitter and the substitute antenna, is the spurious emission component at this frequency.

viii. Repeat the measurement from step ii) to step vii) for the test antenna with horizontal polarization.

3.1. Radio devices within the scope regulated by Article 1.1 must comply with the technical regulations set forth in this Standard.

At this measurement position, the ground plane forms a desired reflection path, thus the signal received by the antenna is the sum of signals from direct and reflected paths. This creates a unique received signal level for each height of the transmitting antenna (or EUT) and receiving antenna above the ground plane.

3. MANAGEMENT PROVISIONS

A variable-height antenna mast (from 1 m to 4 m) allows optimal positioning of the test antenna to maximize the coupling between antennas or between an EUT and the test antenna.

3.2. The testing/measurement for technical requirements of this standard (excluding Section 2.2.2.3.3, Section 2.3.1.3.2) to implement conformity certification and declaration must be carried out in accordance with current regulations. Organizations and individuals are permitted to use the results of testing/measurement from domestic laboratories designated or foreign laboratories recognized, or the results of testing/measurement from manufacturers for the requirements at Sections 2.2.2.3.3, Section 2.3.1.3.2 to implement conformity certification and declaration.

3.3. Measuring instruments and equipment: Shall comply with current regulations.

4. RESPONSIBILITIES OF ORGANIZATIONS AND INDIVIDUALS

Organizations and individuals related have the responsibility to implement regulations on conformity certification and declaration of devices within the scope regulated in Article 1.1 and shall be subject to inspection by state management agencies according to current regulations.

Chapter 5. ORGANIZATION OF IMPLEMENTATION

5.1. The Telecommunications Administration, the Radio Frequency Management Department, and Provincial Departments of Information and Communications have the responsibility to organize guidance for implementing management of terrestrial mobile radio equipment with integrated antennas for analog voice communication according to this standard.

5.2. This standard replaces QCVN 37:2011/BTTTT "National Technical Regulation on Mobile Radio Equipment with Integrated Antennas for Analog Voice Communication."

5.3. In case there are changes, supplements, or replacements to the provisions set out in this Standard, they shall be implemented according to the new document.

5.4. During the implementation of this standard, if any issues arise or difficulties occur, organizations and individuals concerned shall reflect them in writing to the Ministry of Information and Communications (Science and Technology Department) for guidance and resolution.

 

ANNEX A

Product Name, Goods According to QCVN

Radiation field measurement

A.1. Measurement positions and general arrangement for measurements using radiation fieldsNo. This annex provides three commonly used measurement positions for radiation field measurements: non-reflective chamber, non-reflective chamber with ground plane, and outdoor test area (OATS). These measurement positions are often referred to as free-field measurement positions. Both absolute and relative measurements can be performed at these positions. When performing absolute measurements, the chamber must be checked. Detailed evaluation procedures are described in relevant sections 2, 3, and 4 of TR 102 2730.

NOTE: To ensure reproducibility and adherence of radiation field measurements, only the following measurement positions should be used for measurements according to this technical regulation.

A.1.1. Non-Reflective Chamber

A non-reflective chamber is a closed room typically lined with radio wave absorptive materials such as pyramidal urethane foam on the walls, floor, and ceiling. The chamber usually has an antenna support column at one end and a turntable at the other. An example of a non-reflective chamber is shown in Figure A.1.

Figure A.1 - Non-Reflective Chamber

The combination of radio wave absorptive materials and the chamber enclosure creates a controlled environment for testing purposes. This type of chamber simulates free-space conditions.

The chamber enclosure creates a test space that reduces interference levels from surrounding signals as well as other external effects, while the radio wave absorptive material minimizes unwanted reflections from walls and ceilings that could affect measurements. In practice, it is easy to create high levels of surrounding interference rejection (from 80 dB to 140 dB), typically resulting in negligible surrounding interference.

The turntable rotates 360° in the horizontal plane and is used to place the test sample (EUT) at an appropriate height (for example, 1 m) above the ground. The chamber must be large enough to allow a minimum measurement distance of 3 m or 2(d/λ (m), choosing the larger value (see A.2.5). The measurement distance used in practical measurements must be recorded along with the test results.

Non-reflective chambers generally have several advantages over other measurement conditions. These include reduced environmental interference, reduced reflections from the floor, ceiling, and walls, and independence from weather conditions. However, there are some disadvantages, such as limited measurement distance and restricted use at low frequencies due to the size of the pyramidal absorber materials. To improve low-frequency performance, a structure combining ferrite tiles and pyramidal urethane foam absorbers can be used.₁+ d₂)²All emission, sensitivity, and immunity measurements can be conducted in a non-reflective chamber without restriction.

A.1.2. Non-Reflective Chamber with Ground Plane

A non-reflective chamber with ground plane is a closed room lined with radio wave absorptive materials such as pyramidal urethane foam on the walls and ceiling. The floor of the chamber is metallic, uncovered, and serves as a ground plane. The chamber usually has an antenna support column at one end and a turntable at the other. An example of a non-reflective chamber with ground plane is shown in Figure A.2.

This type of chamber simulates an ideal outdoor test area where the basic characteristic of the chamber is a perfect infinite ground plane.

Figure A.2 - Non-Reflective Chamber with Ground Plane

In this measurement position, the floor creates a desired reflection path, thus the signal received by the antenna is the sum of the signals from direct paths and reflections. This results in a unique received signal level for each height of the transmitting antenna (or EUT) and receiving antenna above the floor.

The variable height antenna column (from 1 m to 4 m) optimizes the position of the test antenna to achieve maximum coupling between antennas or between an EUT and the test antenna.n lThe turntable rotates 360° in the horizontal plane and is used to place the test sample (EUT) at a specified height, usually 1.5 m, above the floor. The chamber must be large enough to allow a minimum measurement distance of 3 m or 2(d

The rotating table capable of 360° rotation in the horizontal plane is used to place the test sample (EUT) at a specified height, usually 1.5 m, above the ground plane. The test chamber must be large enough to allow a measurement distance of at least 3 m or 2(d

ng tiếp đất

VTĐ, Telecommunications Authority have the capability to measure this draft QCVN (except for harsh condition measurements). For technical specifications that domestic laboratories cannot measure, the draft QCVN provides manufacturers with self-testing options. Detailed provisions are set out in Section 3.2.₁+ d₂)²All emission, sensitivity, and immunity measurements can be conducted in a non-reflective chamber without restriction.

The pre-emission measurement primarily involves determining the "peak" field strength of the Equipment Under Test (EUT) by raising and lowering the receiving antenna on the antenna mast to obtain the maximum interference from direct and reflected signals, then rotating the turntable to find the "peak" value (maximum) within the azimuth plane. At this height of the test antenna, record the amplitude of the received signal. Next, replace the EUT with a substitute antenna (placed at the phase center or amplitude center of the EUT), which is connected to a signal generator. Again, find the "peak" value of the signal and adjust the output level of the signal generator until the signal level obtained in step 1 is achieved on the receiver.

The receiver sensitivity measurements on the ground plane also involve finding the "peak" field strength by raising or lowering the test antenna on the antenna mast to obtain the maximum interference from direct and reflected signals, this time using a test antenna placed at the phase center or amplitude center of the EUT throughout the measurement period. Provide a conversion factor. The test antenna remains at the height as in step 2, while the test antenna is replaced with the EUT. Reduce the signal amplitude to determine the field strength level at which a specified response is obtained from the EUT.

A.1.3. Outdoor Testing Area

The outdoor testing area consists of a turntable at one end and an antenna mast of varying height at the other end on a ground plane, this ground plane being ideally conductive and capable of unlimited expansion. In practice, when good conductivity is achievable, the size of the ground plane will be limited. An example of an open-field measurement position is presented in Figure A.3.

The ground plane creates a desired reflection path, thus the signal received by the receiving antenna is the sum of the signals from direct and reflected paths. The combination of these two signals results in a unique received signal level corresponding to each height of the transmitting antenna (or EUT) and the receiving antenna on the ground plane.

Position characteristics related to antenna positions, turntables, measurement distances, and other measurement position arrangements are similar to those for non-reflective chambers with a ground plane. In emission measurements, the Outdoor Antenna Test Site (OATS) is also used similarly to non-reflective chambers with a ground plane.

Figure A.3 - Outdoor Testing Area

Typical and common measurement setups for ground plane measurement positions are provided in Figure A.4.

Figure A.4 - Measurement Setup at Ground Plane Measurement PositionsPursuant to Decree No. 97/2016/NĐ-CP dated July 1, 2016 of the Government stipulating the contents of statistical indicators under the national statistical indicator system;landing

(Setting up OATS for emission testing simulation)

A.1.4. Test Antenna

Test antennas are commonly used in emission measurement methods. In emission measurements (such as frequency error, effective radiated power, spurious emissions, and adjacent channel power), the test antenna is used to detect the field from the EUT during the first stage of the measurement and from the substitute antenna in other stages. When using a test position to measure receiver characteristics (such as sensitivity and immunity parameters), the test antenna is used as a transmitter.

The test antenna must be mounted on a support that allows it to be used in either horizontal or vertical polarization, and on measurement positions with a ground plane (such as in non-reflective chambers with a ground plane and open space measurement positions), the height of the antenna can be adjusted within a defined range (typically from 1 m to 4 m).

For frequencies between 30 MHz and 1,000 MHz, it is recommended to use dual-polarized antennas (produced according to ANSI C63.5 standard). For frequencies of 80 MHz or higher, dual-polarized antennas should have a length that resonates at the measurement frequency. Below 80 MHz, shorter dual-polarized antennas should be used. However, for spurious emission measurements, a combination of periodic dipole arrays is used to cover the entire frequency range from 30 to 1,000 MHz. For frequencies above 1,000 MHz, it is recommended to use horn antennas, although periodic dipole arrays may still be used.

NOTE: The gain of a tri-element (electromagnetic) antenna is expressed relative to an isotropic radiator.

A.1.5. Substitute Antenna

The substitute antenna is used to replace the EUT in emission parameter measurements (such as frequency error, effective radiated power, spurious emissions, and adjacent channel power). For measurements in the frequency range from 30 MHz to 1,000 MHz, the substitute antenna must be a dual-polarized antenna (produced according to ANSI C63.5 standard). For frequencies of 80 MHz or higher, the dual-polarized antennas must have a length that resonates at the measurement frequency. Below 80 MHz, shorter dual-polarized antennas should be used. For measurements above 1,000 MHz, a horn antenna should be used. The center of this antenna must coincide with the phase center or amplitude center of the EUT (as specified in the measurement method).

A.1.6. AMeasurement Antenna

The measurement antenna is used in EUT receiver parameter measurements (such as immunity and sensitivity measurements). The purpose of the antenna is to perform near-field electric field strength measurements of the EUT. For measurements in the frequency range from 30 MHz to 1,000 MHz, the measurement antenna should be a dual-polarized antenna (produced according to ANSI C63.5 standard). For frequencies of 80 MHz or higher, the dual-polarized antennas must have a length that resonates at the measurement frequency. Below 80 MHz, shorter dual-polarized antennas should be used. The center of this antenna must coincide with the phase center or amplitude center of the EUT (as specified in the measurement method).

A.2. Guidelines for Using Radiated Measurement Positions

Part I sets forth specific procedures, equipment setup, and evaluation steps that should be conducted prior to performing any radiation measurements. This mechanism applies generally to all measurement positions described in Appendix A.

A.2.1. Measurement Position Evaluation

No measurement should be performed at a position that has not been certified with a valid calibration certificate. The calibration procedures for different types of measurement positions, as detailed in Appendix A (for example, non-reflective rooms, non-reflective rooms with ground planes, and outdoor test areas), are presented in Sections 2, 3, and 4 of TR 102 273.

A.2.2. Preparation of the Equipment Under Test (EUT)

Manufacturers must provide information about the EUT including operating frequency, polarization, supply voltage, and reference surface. Additional specific information regarding the type of EUT should include carrier power, channel spacing, other operational modes (such as low and high power modes), and whether operation is continuous or subject to a maximum test cycle (for example, 1 minute on, 4 minutes off).

Where necessary, there should be a minimum-sized mounting plate to mount the EUT on a turntable. This plate must be made from material with a relatively low dielectric constant (for example, less than 1.5) and low electrical conductivity such as expanded polystyrene, soft balsa wood, etc.

A.2.3. Powering the EUT

All measurements must be carried out using power supplies wherever possible, including measurements with EUT designed to operate solely on batteries. In all cases, power leads must be connected to the EUT's power input terminals (and monitored by a digital voltmeter) but batteries should remain in the device and insulated from the rest of the equipment, possibly by taping over the contact points.

However, the presence of these power cables may affect the quality of the EUT measurement. For this reason, conditions must be created to make the measurement process "transparent." This can be achieved by directing them away from the EUT and leading them down behind the screen, ground plane, or wall of the measurement position (as appropriate) along the shortest possible paths. Care should be taken to minimize losses on these cables (for example, by twisting the cables together, loading them with ferrite beads every 0.15 meters, or other loads).

A.2.4. Setting Volume Control for Analog Speech Measurements

Unless otherwise specified, in all analog speech measurements of receivers, the receiver amplitude must be adjusted so that the output power is at least 50% of the rated output power. If the amplitude control is stepped, the amplitude control should be set so that the first step provides at least 50% of the rated output power. The receiver amplitude should not be readjusted between normal and limit measurement conditions during the measurements.

A.2.5. Distance

The distance for all types of measurement positions should be sufficiently large to allow far-field measurements of the EUT, i.e., it should be equal to or greater than:

Where:

For coal-fired thermal power plants where the enterprise holds 100% of the registered capital and uses 100% of its own capital to invest in the project approved by the competent authority, E is determined as 100%;₁ the largest diameter of the EUT/dipole after replacement (m);

For coal-fired thermal power plants where the enterprise holds 100% of the registered capital and uses 100% of its own capital to invest in the project approved by the competent authority, E is determined as 100%;₂ the largest diameter of the test antenna (m);

λ is the wavelength of the measurement frequency (m).

Note that in the replacement part of this measurement, if both the test antenna and the replacement dipole are half-wave dipoles, the minimum distance for far-field measurement will be: 2λ.

Note that in the measurement results report, when any of these conditions are not met, additional uncertainty may be combined with the measurement results.

NOTE 1: For fully non-reflective chambers, at any turntable angle, no part of the EUT's amplitude should lie outside the "quiet zone" of the chamber at the rated measurement frequency.

NOTE 2: The "quiet zone" is a volume within a non-reflective chamber (without a floor) where the specified quality has been proven through testing or guaranteed by the designer/manufacturer. This specified quality is usually the reflection coefficient of the absorber panels or a directly related parameter (such as signal amplitude and phase uniformity). However, it should also be noted that the specified levels for the quiet zone may vary.

NOTE 3: For non-reflective chambers with a floor, the ability to scan the entire height, i.e., from 1 meter to 4 meters, should ensure that no part of the test antenna lies below the 1-meter height of the absorber panels. For both types of non-reflective chambers, the absorber panel reflection coefficient should not be less than -5 dB. When any of these conditions are not met, measurements should not be performed.

NOTE 4: For non-reflective chambers with a floor and open area test sites, no part of the antenna should be within 0.25 meters of the floor at any time during the testing process. When any of these conditions are not met, measurements should not be performed.

A.2.6. Crime Minister control of the Measurement Position

Cables at both ends of the test site must be laid horizontally at least 2 meters away from the measurement area (unless they have already touched the rear wall in the case of both types of non-reflective chambers), then run vertically and outside the floor or housing (as appropriate) of the measuring equipment. Care should be taken to minimize losses on these cables (for example, by insulating solder joints with ferrite beads or other loads). For cables, routing and insulation should match the evaluation documentation.

NOTE: For test sites with floor reflections (such as non-reflective chambers with floors and open area test sites), the requirement for a 2-meter distance above may not be met where a cable reel is combined with an antenna mast.

Calibration data must be available for all components of the measuring equipment. For measurements and replacement antennas, this data should include the gain factor relative to the isotropic radiator (or antenna factor) corresponding to the measurement frequency. Knowledge of the VSWR values of replacement and measurement antennas is also required.

Calibration data for all cables and attenuators should include external connection loss (insertion loss) and VSWR across the full measurement frequency range. All plots of external connection loss and VSWR must be recorded in the measurement results report.

Where calibration tables/factors are required, they should be readily available at the location.

For all items of measuring equipment, the maximum errors and error distribution should be known, for example:

- Cable loss: ±0,5 dB with rectangular distribution;

- Measuring receiver: signal level accuracy (standard deviation) 1,0 dB with Gaussian (Gauss) error distribution.

At the start of measurements, system checks must be performed on the items of measuring equipment used at the test location.

A.3. Signal Combining

A.3.1. Overview

The presence of electrical conductors in the radiation field may cause interference to the radiation field and result in additional measurement uncertainty. These interferences can be reduced by using appropriate combining methods that create signal isolation and have minimal impact on the field (for example, optical and acoustic combining).

A.3.2. Data Signals

Signal isolation can be achieved by using optical, ultrasonic, or infrared measures. The impact on the field can be minimized by suitable optical fiber connections, which require appropriate infrared or ultrasonic radiating connections to reduce surrounding interference.

A.3.3. Analog and Voice Signals

An acoustic combiner should be used where there is no audio output port.

When using an acoustic combiner, it should be checked whether surrounding interference affects the measurement results.

A.3.3.1. Description of Acoustic Combiner

The acoustic combiner consists of a plastic horn, an acoustic tube, and a microphone with an appropriate amplifier. Materials used to make the horn and tube should have low conductivity and a relative dielectric constant of less than 1,5 dB.

- The acoustic tube should be long enough to connect from the Equipment Under Test (EUT) to the microphone and placed in a position that does not affect the RF field. The tube should have an internal diameter of approximately 6 mm and thickness of about 1,5 mm, and be flexible enough not to obstruct the rotation of the turntable.

- The plastic horn should match the speaker size of the EUT, have soft foam rubber attached to its edge, and be attached to one end of the acoustic tube, while the microphone is attached to the other end. Aligning the center of the horn with the relevant copy position relative to the EUT is crucial because this central position has a strong influence on the frequency response to be measured. This can be achieved by placing the EUT in a closed acoustic combiner mounting fixture provided by the equipment manufacturer, with the horn being an integral part.

- The microphone should have a flat frequency response within 1 dB in the range from 50 Hz to 20 kHz, with a minimum linear dynamic range of 50 dB. The sensitivity of the microphone and the output level of the receiver should be suitable to measure a signal-to-noise ratio of at least 40 dB at the nominal output level of the EUT. The size of the microphone must be small enough to fit into the acoustic tube.

- The frequency correction circuit should adjust the frequency response of the acoustic combiner so that the sound SINAD measurement is accurate (see Appendix F [A.6] of IEC 60489-3).

A.3.3.2. Calibration

The purpose of calibrating the acoustic combiner is to determine the sound SINAD ratio, equivalent to the SINAD ratio at the receiver output.

Figure A.5 - Calibration Measurement Diagram

a) The acoustic combiner must be connected to the equipment, if necessary using a measuring combiner. A direct electrical connection to the terminals of the output converter will be made. The signal generator must be connected to the receiver input (or the input of the measuring combiner). The signal generator must be at the nominal frequency of the receiver and modulated by normal test modulation.

b) Where possible, adjust the receiver volume to at least 50% of the apparent output power, and in the case of stepped volume adjustment, adjust to the first step providing at least 50% of the apparent output power.

c) The input signal level must be reduced until the electrical SINAD ratio reaches 20 dB, connected at position 1. The input signal level must be recorded.

d) With the same input signal level, measure and record the equivalent sound SINAD ratio, connected at position 2.

e) Repeat steps c) and d) with an electrical SINAD ratio of 14 dB, measure and record the equivalent sound SINAD ratio.

A.4. Measurement Combiner Box

A.4.1. Description

The measurement combiner box is a radio frequency frequency combiner combined with an integrated antenna device to combine this integrated antenna with a 50 Ω RF terminal at the working frequency of the equipment under test. This allows certain measurements to be carried out using lead-through measurement methods. Relative measurements can only be performed at or near frequencies for which the measurement combiner box has been calibrated.

Additionally, the measurement combiner box must provide:

a) A connection to an external power supply;

b) An audio interface or direct connection or an acoustic combiner.

The measurement combiner box is usually supplied by the manufacturer.

The operational characteristics of the measurement combiner box must comply with the following basic parameters:

a) The insertion loss must not exceed 30 dB;

b) The variation in insertion loss across the frequency band used for measurement must not exceed 2 dB;

c) The electrical circuit attached to the RF combiner must not contain active devices and nonlinear devices;

d) The VSWR at the 50 Ω jack must not exceed 1,5 in the measurement frequency band;

e) The insertion loss must not depend on the position of the measurement combiner box and must not be affected by surrounding objects and people. The insertion loss must be reproducible when the equipment under test is removed and replaced;

f) The insertion loss must remain unchanged when environmental conditions change.

Characteristics and calibration must be included in the measurement report.

A.4.2. Calibration

The calibration of the measurement combiner box establishes the relationship between the output of the signal generator and the input field strength delivered to the equipment inside the measurement combiner box.

Calibration is only valid at a specific frequency and specific polarization of the reference field.

Figure A.6 - Calibration Measurement Diagram

a) Using the method described in section 2.3.1.3.1, measure the sensitivity in terms of field strength and record the value of this field strength in dBµV/m and the type of polarization used.

b) Place the receiver in the measurement combiner box connected to the signal generator. Record the level generated by the signal generator when the SINAD is 20 dB.

c) The calibration of the measurement combiner box is the relationship between the field strength in dBµV/m and the level of the signal generator in dBµV emf. This relationship is considered linear.

A.4.3. Implementation Method

For transmitter measurements, calibration is not required.

For receiver measurements, calibration is necessary.

To apply the desired signal level specified in terms of field strength, it must be converted to the signal generator (emf) level using the calibration curve of the measuring instrument box. Apply this value to the signal generator.

 

Provisions on the HS Code of Terrestrial Mobile Radio Equipment and Terrestrial Radio Relay Equipment

Product Name, Goods According to QCVN

Technical specifications for specific measurement schemes

B.1. Technical specifications for power measurement receivers

Power measurement receivers are used to measure the power of adjacent channel transmitters. The receiver includes a mixer, oscillator, IF filter, amplifier, attenuation meter, and a level indicator as shown in Figure B.1.

Figure B.1 -June 2024;Power measurement receiver

An RMS voltmeter calibrated in dB can be used instead of the attenuation meter with an RMS value display. The technical characteristics of the power measurement receiver are presented in Sections B.1.1 to B.1.5.

B.1.1. IF Filter

The IF filter must be within the limits of the selectivity characteristics shown in Figure B.2 below:

Figure B.2 - IF Filter

Depending on the channel spacing, the selectivity characteristics must maintain a frequency separation from the center frequency of the adjacent channel as given in Table B.1.

Table B.1 - Selectivity Characteristics

Frequency separationNo. of the filter curve from the nominal center frequency of the adjacent channel, kHzFrequency separationNo. of the filter curve from the nominal center frequency of the adjacent channel, kHzFrequency separationNo. of the filter curve from the nominal center frequency of the adjacent channel, kHz

Depending on the channel spacing, the attenuation points shall not exceed the tolerances given in Tables B.2 and B.3.

Bn lTable B.2 - Attenuation Points Near Carrier

Range of tolerance, kHzRange of tolerance, kHzRange of tolerance, kHz

Table B.3 - Attenuation Points Far from Carrier

Range of tolerance,international, kHzRange of tolerance,international, kHzRange of tolerance,international, kHz

The minimum attenuation of the filter outside the 90 dB attenuation point shall be greater than or equal to 90 dB.

B.1.2. Attenuation Meter

The attenuation meter must have a minimum range of 80 dB and the reading accuracy shall be 1 dB. For future regulations, readings above 90 dB should be reduced.

B.1.3. RMS Level Meter

The RMS level meter must accurately indicate non-sine wave signals with a peak-to-RMS ratio up to 10:1.

B.1.4. Oscillator and Amplifier

The oscillator and amplifier need to be designed such that the measurement of the power of the adjacent channel of an unmodulated transmitter with low noise does not exceed -90 dB at a channel spacing of 25 kHz and -80 dB at a channel spacing of 12.5 kHz, compared to the carrier of the oscillator, the inherent noise of the unmodulated transmitter with low noise has little effect on the measurement result.

B.2. Spectrum Analyzer Characteristics

B.2.1. Adjacent Channel and Interleaved Channel Power Measurement lancens and interleaved

The spectrum analyzer characteristics must meet the following minimum requirements:

- The accuracy of the frequency marking point reading must be within ±100 Hz;

- The accuracy of relative amplitude measurements must be within ±3.5 dB.

The spectrum analyzer may be adjusted to allow two components of equal amplitude but different frequencies separated by 200 Hz to be displayed separately on the screen.

For statistically distributed modulations, the spectrum analyzer and integrated equipment (if applicable) must allow the determination of energy spectral density (energy over time and bandwidth) integrated over the specified bandwidth. The effective energy of all discrete components, spectral energy density, and noise power in the selected bandwidth can be combined and measured against the carrier power.

The spectrum analyzer must have a dynamic range greater than 90 dB and the phase noise in adjacent channels should not limit the measurement of adjacent channel power. To confirm this, use the measurement technique in Section 2.2.3.3 to measure the adjacent channel power with a CW signal source with phase noise below -120 dBc/Hz at the center of the adjacent channel. The results obtained are as follows:

- The maximum adjacent channel power observed under these conditions shall not exceed -70 dBc;

- The maximum interleaved channel power measured under these conditions shall not exceed -80 dBc.

NOTE: A resolution bandwidth of 500 Hz may be used for this measurement instead of 100 Hz to reduce measurement time.

B.2.2. Unwanted Emission Measurement

Technical specifications include the following requirements.

A resolution bandwidth of 1 kHz may be used to measure the amplitude of the signal or noise at a level 3 dB or higher than the noise of the spectrum analyzer, as displayed on the screen, with an accuracy of ±2 dB when there is a desired signal.

The accuracy of relative amplitude measurements must be within ±1 dB.

For statistically distributed modulations, the spectrum analyzer and integrated equipment (if applicable) will allow the determination of actual spectral energy density (energy over time and bandwidth) integrated over the specified bandwidth.

B.3. Integrated and Combined Power Equipment

Integrated and combined power equipment is connected to the video output of the spectrum analyzer mentioned in Section B.2.

The effective energy of all discrete components, spectral energy density, and noise power in the selected bandwidth can be combined and measured against the carrier power.

 

Annex C

Product Name, Goods According to QCVN

Band-reject filter (for SINAD meter)

The characteristics of the band-reject filter used in the distortion factor meter and the SINAD meter must satisfy: at the output, the 1000 Hz frequency shall be attenuated by at least 40 dB and at 2000 Hz the attenuation shall be less than 0.6 dB. The filter characteristic is flat within 0.6 dB in the frequency ranges from 20 Hz to 500 Hz and from 2000 Hz to 4000 Hz.

In the case of unmodulated signals, the filter cannot cause more than 1 dB attenuation to the total noise power at the output of the device being tested.

 

QCVN 37:2018/BTTTT was compiled by the Post and Telecommunications Science and Technology Institute, reviewed and submitted for approval by the Department of Science and Technology, and issued together with Circular No.  /2018/TT-BTTTT dated  month  year 2018.

[1] ETSI EN 300 296 V2.1.1 (2016-03): Land Mobile Service; Radio equipment using integral antennas primarily for analog speech; Harmonized standard covering the essential requirements of Article 3.2 of Directive 2014/53/EU.

[2] IEC 60489-3 (1988): "Measurement methods for radio equipment used in mobile services; Part 3: Receivers for A3E or F3E emissions."

[3] ITU-T Recommendation O.41 (1994): "Psophometer for use on telephone-type circuits."

[4] ETSI EN 300 086: "Land Mobile Service; Radio equipment with an internal or external RF connector primarily for analog speech; Harmonized standard covering the essential requirements of Article 3.2 of Directive 2014/53/EU."

 

d.1. Amount of taxable income in Vietnam:is a communicable disease or parasite listed by the MinistryCOMBINED Opinion OF THEếNATIONALộ INTELLECTUAL PROPERTYề D2. The Medical Examination Board includes: The Central Medical Examination Board. TECHNOLOGY REGULATIONSU,TECHNICAL REGULATIONS OF THE STATE
||| (Letter No. 3558/BKHCN-TĐC of the Ministry of Science and Technology dated August 9/11/2018)

||| The Ministry of Science and Technology has reviewed the draft QCVN mentioned above in accordance with the Law on Standards and Technical Regulations, Decree No. 127/2007/NĐ-CP dated August 1, 2007 of the Government detailing certain provisions of the Law on Standards and Technical Regulations, and Decree No. 78/2018/NĐ-CP dated May 16, 2018 of the Government amending and supplementing some articles of Decree No. 127/2007/NĐ-CP on the Law on Standards and Technical Regulations.

1||| Compliance of the QCVN with legal provisions:urinary catheter ||| - The draft QCVN was developed in accordance with the functions and tasks of the Ministry of Information and Communications as stipulated in Point a Clause 2 Article 5 of the Law on Radio Frequency Wavelengths and Decree No. 78/2018/NĐ-CP dated May 16, 2018 amending and supplementing certain articles of Decree No. 127/2007/NĐ-CP.

||| - Part 3. Provisions on management in the draft QCVN:

||| + Clause 5 Article 1 of Decree No. 78/2018/NĐ-CP provides that "In cases where national technical standards are established to manage products and goods in Group 2, the Minister or head of a ministerial-level agency shall issue national technical standards after reaching consensus with the Minister of Science and Technology regarding the measures for managing products and goods in the technical standards to ensure that they do not create unnecessary technical barriers to production, business, and trade activities." Therefore, to ensure consistency in management measures, we recommend that your Ministry specify the content of conformity declaration and certification in accordance with Circular No. 28/2012/TT-BKHCN dated December 12, 2012 and Circular No. 02/2017/TT-BTTTT dated March 31, 2017 amending and supplementing certain articles of Circular No. 28/2012/TT-BKHCN dated December 12, 2012. We suggest specifying the basis for the conformity declaration management measure as follows:

||| - Results of self-assessment for compliance by organizations and individuals;

||| - Results of certification by accredited or recognized certification bodies in accordance with the law;

||| - Results of certification by designated certification bodies in accordance with the law.

||| The draft QCVN has stipulated that related organizations and individuals have the responsibility to implement regulations on conformity certification and be subject to inspection by state management agencies in accordance with current regulations.

||| Current regulations of the Ministry of Information and Communication on conformity declaration: Apply Circular No. 30/201

||| /TT-BTTTT which specifies activities related to conformity certification and declaration for products and goods under the specialized management of the Ministry of Information and Communication. Circular No. 30/2011/TT-BTTTT has fully provided all relevant contents.ng||| Presentation of the regulation as above has been reflected in the sets of QCVNs on radio equipment and telecommunications that have been issued for management purposes.1||| + We recommend that your Ministry review and consider the qualification requirements for testing laboratories and certification organizations according to Decree No. 107/2016/NĐ-CP on conditions for operating conformity assessment services.shall||| Qualification of testing laboratories has been considered during the development of the QCVN. Currently, some measurement rooms of the Radio Frequency Wavelengths Administration and Telecommunications Administration can measure the draft QCVN (except for harsh condition measurements). For technical indicators that domestic testing laboratories cannot measure, the draft QCVN has specified that manufacturers can conduct their own inspections. Detailed provisions are set out in Section 3.2.June 2024;||| - According to Clause 2 Article 16 of the Measurement Law 2011, it is recommended to supplement the requirement that measuring instruments and equipment must meet technical measurement requirements and must be calibrated and verified in accordance with the law on measurement. Number of employees and workers directly involved in the joint venture and association activities of the organization over the last 03 yearsThis Decree details certain provisions and measures to implement the Intellectual Property Law of 2005 and the Law amending and supplementing certain provisions of the Intellectual Property Law of 2009 (hereinafter referred to collectively as the Intellectual Property Law) regarding copyright and related rights.

||| The draft QCVN has added this content in the management provisions of the standard, specifically:to||| Measuring Instruments and Equipment: Comply with current regulations.policies||| Consistency and synchronization within the system of QCVNs: June 2024;||| The content of the draft QCVN does not conflict or overlap with other QCVNs in the QCVN system.n l||| Regarding compliance with professional requirements, procedures, and construction of QCVNs:

||| Draft QCVN's dossier, structure, procedure, process, and presentation: generally complete, complying with professional guidance as stipulated in Decree No. 127/2007/NĐ-CP dated August 1, 2007 "Detailed Implementation of Certain Provisions of the Law on Standards and Technical Regulations" and Circular No. 23/2007/TT-BKHCN dated September 28, 2007 "Guidelines for Developing, Reviewing, and Issuing Technical Standards" of the Ministry of Science and Technology.

||| 4. Explanation of adoption of suggestions for revision (as per the letter's appendix)itself||| SuggestionsJune 2024; ||| ExplanationNo. VTĐ, Telecommunications Department are both capable of measuring this draft QCVN (except for measurements under harsh conditions). For technical indicators that domestic laboratories have not yet been able to measure, the draft QCVN has specified that manufacturers can conduct their own testing. Detailed provisions are set out in Section 3.2. in aught QCVN has provided for manufacturers to self-test. Detailed provisions are set out in Section 3.2.n lo QCVN đã quy định để nhà sản xuất có thể tự đo kiểm. Quy định chi tiết tại mục 3.2.

- Pursuant to Clause 2, Article 16 of the 2011 Measurement Law, it is proposed to supplement the provision that measuring instruments and equipment must meet measurement technical requirements and must be calibrated and verified in accordance with the provisions of the law on measurement.

The draft QCVN has supplemented this content in the section on management regulations of the standard.

3.3. Measuring instruments and equipment: Comply with current regulations.

||| Water-based fire extinguishing solutions."b) In addition to the lists of public services issued according to the provisions of Clause 2, Article 4 of this Decree, specialized agencies under provincial People's Committees shall report to the provincial People's Committee for decision-making on amending, supplementing, or issuing the list of public services funded by the state budget within their jurisdiction and consistent with the local budget capacity within the approved budget by the Provincial People's Assembly, and send it to the Ministry of Finance and relevant ministries and sectors for supervision during implementation."To unify and synchronize within the system of QCVNs:

The content of the QCVN draft does not conflict or overlap with other QCVNs in the QCVN system.

3. VRegarding complianceâ195/2013/NĐ-CP dated November 21, 2013 of the Government detailing certain provisions and measures to enforce the Law on PublishingDeputy ministers of ministerial-level agencies, with professional requirements, procedures, andDeputy ministers of ministerial-level agencies, organize credit institutions, foreign bank branches are responsible for organizing the implementation of this Circular.|||construction of QCVNs:

Documentation, structure, procedure, process, presentation of the QCVN draft: generally complete, complying with professional guidelines as stipulated in Decree No. 127/2007/NĐ-CP dated August 1, 2007 "Detailed Regulations Implementing Certain Provisions of the Law on Technical Standards and Regulations" and Circular No. 23/2007/TT-BKHCN dated September 28, 2007 "Guidelines for Drafting, Reviewing, and Issuing Technical Standards" issued by the Ministry of Science and Technology.

4. Explanation of adoption of suggestions for amendments (as per the Appendix of the letter)

5. Conclusion

- To ensure compliance with legal regulations on standards and technical standards, it is recommended that the Ministry adopt and finalize the draft QCVN based on the above review before issuance.

- After issuance, it is recommended to register the QCVN with the Ministry of Science and Technology in accordance with Article 36 of the Standard and Technical Regulation Law./.