Circular No. 34/2015/TT-BTTTT Issuing "National Technical Regulations for Direct Calling Number Selection Receivers on Ships Operating on MF, MF/HF and VHF Frequency Bands in Maritime Mobile Services"

CIRCULAR

Issuing "Article 24Technical regulations on shipborne direct calling number selection receivers

on shipsoperating in the MF, MF/HF, and VHF frequency bands Industry and

"maritime mobile business"

__________________________

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

Pursuant to the Law on Telecommunications dated November 23, 2009;

Decree No. 127/2007/Decree No. 01/2007/NĐ-CP dated August 1, 2007 of the Government detailing and guiding the implementation of certain provisions of the Law on Standards and Technical Regulations; The Government shall provide detailed regulations and guidance on implementing certain provisions of the Law on Technical Regulations and Standards;No. The Government shall define the functions, tasks, powers, and organizational structure of the Ministry of Information and Communications;

Pursuant to DecreeNo. Decree No. 132/2013/NĐ-CP dated October 16, 2013 of the Government stipulating the functions, tasks, powers, and organizational structure of the Ministry of Information and Communications; Technology|||activities on MF, MF/HF, and VHF frequency bands in maritime mobile services; regulation on shipborne watchkeeping receivers for reception of Digital Selective Calling operating in the MF, MF/HF and VHF bands of maritime mobile

At the proposal of the Director of the Science and Technology Department service,

The Minister of Information and Communications issues this Circular stipulating Technical regulations on shipborne direct calling number selection receivers operating in the MF, MF/HF, and VHF frequency bands in maritime mobile services. 2.1.2. Temperature test These technical regulations on shipborne direct calling number selection receivers operating in the MF, MF/HF, and VHF frequency bands in maritime mobile services are hereby promulgated.

Article 1. Annexed hereto are the national technical regulations on shipborne direct calling number selection receivers operating in the MF, MF/HF, and VHF frequency bands in maritime mobile services (QCVN 97:2015/BTTTT).

Article 2. This Circular takes effect from July 1, 2016.

Article 3. The Head of the Office, the Director of the Science and Technology Department, the Heads of agencies and units under the Ministry of Information and Communications, the Directors of Provincial Departments of Information and Communications, and relevant organizations and individuals shall be responsible for implementing this Circular.

QCVN 97:2015/BTTTT

NATIONAL TECHNICAL REGULATIONS ON SHIPBORNE WATCHKEEPING RECEIVERS FOR RECEIVING DIGITAL SELECTIVE CALLING OPERATING IN THE MF, MF/HF AND VHF BANDS OF MARITIME MOBILE SERVICE

National technical regulation on shipborne watchkeeping receivers for reception of Digital Selective Calling operating in the MF, MF/HF and VHF bands of maritime mobile servicel2.2. Direct receiving MF/HF receiver2.2.2. Adjacent channel selectivity2.2.4. Modulation response s2.2.7. Dynamic range

2.4.4. Support for Multi PLP

Chapter 1. GENERAL PROVISIONS

1.1. Scope of Application

1.2. Applicability

1.3. Referenced Documents

1.4. Terms and Definitions

1.5. Abbreviations

Chapter 2. TECHNICAL PROVISIONS

2.1. Environmental requirementsầ2.2.9. Spurious emission

2.1.1. Vibration test

2.2.11. Scanning efficiency

2.1.2. Temperature test

2.3.1. Call sensitivity

2.1.3. Corrosion test

2.3.3. Co-channel interference rejection

2.2. MF/HF receiver

2.3.5. Spurious response rejection

2.2.1. Call sensitivity ứ2.3.7. Dynamic range

2.2.2. Adjacent channel selectivity

2.3.9. Spurious emission

2.2.3. Co-channel interference suppression

ANNEX B (REGULATIONS) Regulations on testing conditions

2.2.4. Modulation transfer response

QCVN 97:2015/MIC was developed based on ETSI EN 301 033 V1.4.1 (2013-09) of the European Telecommunications Standards Institute (ETSI).

2.2.5. False response rejection

MIC

2.2.6. Blocking

regulation on shipborne watchkeeping receivers for reception of Digital Selective Calling operating in the MF, MF/HF and VHF bands of maritime mobile

2.2.7. Dynamic range

This standard specifies technical requirements for direct calling receivers operating on MF, MF/HF, and VHF bands allocated in the national radio frequency spectrum planning for maritime mobile services.

2.2.8. Spurious emissions to antenna port

For integrated equipment, this standard specifies requirements and measurement methods only for the direct calling receiver part.

2.2.9. Spurious emissions radiated

ITU-T Recommendation E.161 (2001): "Arrangement of digits, letters and symbols on telephones and other devices that can be used for gaining access to a telephone network".

3. MANAGEMENT PROVISIONS

4. RESPONSIBILITIES OF ORGANIZATIONS AND INDIVIDUALS

Chapter 5. ORGANIZATION OF IMPLEMENTATION

2.2.10. Protection of receiver antenna input circuits

service".

ANNEX C 2.2.11. Scanning performance

QCVN 110:2017/BTTTT was compiled by the Post and Telecommunications Science and Technology Institute, reviewed by the Department of Science and Technology, and promulgated along with Circular No. 24/2017/TT-BTTTT dated October 17, 2017.

 

 

 

 

 

 

 

 

 

 

 

Foreword

processing equipment - Keyboard layouts for numeric applications".

2.3. VHF receiverfaces - Part 1: Single talker and multiple listeners". dated 11 the 12 2015.

 

 

NATIONAL TECHNICAL REGULATIONS ON SHIPBORNE WATCHKEEPING RECEIVERS FOR RECEIVING DIGITAL SELECTIVE CALLING OPERATING IN THE MF, MF/HF AND VHF BANDS OF MARITIME MOBILE SERVICE

National 2.3.1. Call sensitivity .4.1: "Electromagnetic compatibility and Radio spectrum Matters (ERM); Uncertainties in the measurement of mobileANNEX I.A[31]2.3.2. Adjacent channel selectivity s2.2.7. Dynamic range

Chapter 1. GENERAL PROVISIONS

1.1. Scope of Application

°C and maintained during the measurement period from 10 hours to 16 hours.

2.3.3. Co-channel interference suppression

At the end of the measurement period, the EUT must be tested for performance.

1.2. Applicability

2.3.4. Modulation transfer response

1.3. Referenced Documents

The temperature of the test room must be maintained at +55 °C ± 3 °C throughout the performance testing period.

2.3.5. False response rejection sAfter completing the testing, return the EUT to normal room temperature and relative humidity.

2.3.6. Blocking t,2.1.2.1.3. Requirements

2.3.7. Dynamic rangeP2.1.2.2. High temperature test

2.3.8. Spurious emissions to antenna port12.1.2.2.1. DefinitionANNEX I.A[31]2.3.9. Spurious emissions radiated

ANNEX A (Provisions) General requirements for watchkeeping DSC receivers4. Enterprises have the right to choose electronic energy labels for equipment and devices suitable for electronic energy labeling or to use other types of energy labels to implement energy labeling.ANNEX B (Provisions) Measurement conditions

(Provisions) Radiation measurements

QCVN 97:2015/BTTTT is based on ETSI EN 301 033 V1.4.1 (2013-09) of the European Telecommunications Standards Institute (ETSI).lQCVN 97:2015/BTTTT was compiled by the Post and Telecommunications Science and Technology Institute, reviewed and submitted for approval by the Science and Technology Department, and issued together with Circular No. 34/2015/TT-BTTTT. sAfter completing the testing, return the EUT to normal room temperature and relative humidity.

technical regulation on shipborne watchkeeping receivers for reception of Digital Selective Calling operating in the MF, MF/HF and VHF bands of maritime mobile service This technical regulation specifies the technical requirements for shipborne direct calling number selection receivers operating in the MF, MF/HF, and VHF frequency bands allocated in the national radio frequency spectrum planning for maritime mobile services.ANNEX I.A[31]This technical regulation applies to stand-alone receivers or those integrated into DSC equipment or integrated into wireless telephones. sFor integrated equipment, this technical regulation only specifies the requirements and measurement methods for the direct calling number selection receiver portion.lThis technical regulation applies to organizations and individuals engaged in production, business, and use of equipment within the scope of this technical regulation on the territory and territorial waters of Vietnam.

ITU-T Recommendation E.161 (2001): "Arrangement of digits, letters and symbols on telephones and other devices that can be used for gaining access to a telephone network".

ITU-R Recommendation M.493-13: "Digital selective-calling system for use in the maritime mobile service".

1.4. Terms and Definitions

ISO 3791 (1976): "Office machines and data processing equipment - Keyboard layouts for numeric applications". IEC 61162-1 (2010): "Maritime navigation and radio communication equipment and systems - Digital interfaces - Part 1: Single talker and multiple listeners".

ETSI TR 100 028-1 v4.1: "Electromagnetic compatibility and Radio spectrum Matters (ERM); Uncertainties in the measurement of mobile radio equipment characteristics; Part 1".

ITU-T Recommendation V.11 (1996): "Electrical characteristics for balanced double-current interchange circuits operating at data signalling rates up to 10 Mbit/s". IEC 60417: "Graphical symbols for use on equipment".

ITU-R Recommendation M.541-9 (2004): "Operational procedures for the use of digital selective calling equipment in the maritime mobile service".

ETSI EN 300 338-2: "Electromagnetic compatibility and Radio spectrum Matters (ERM); Technical characteristics and methods of measurement for equipment for generation, transmission and reception of Digital Selective Calling (DSC) in the maritime MF, MF/HF and/or VHF mobile service; Part 2: Class A/B DSC".

ITU-R Recommendation SM.332-4 (1978): "Selectivity of receivers".

ITU Regulations (2012).

1.4.1. Assigned frequency

Frequency assigned to the receiver.

Businessdevelopment1.4.2. Continuous watch

Uninterrupted radio watch except for short periods when the ship's receiving function is reduced or blocked by internal communications or during maintenance checks.amendenergy 1.4.3. F1BPType of emission using frequency modulation with digital information without subcarrier for automatic reception.

1.4.4. G2B^-2 Type of emission using phase modulation with digital information using a subcarrier for automatic reception.

1.4.5. J2BmType of emission using single-sideband amplitude modulation with digital information using a subcarrier for automatic reception, with the subcarrier suppressed to a level less than 40 dB below peak power.

1.4.6. Performance checkmType of emission using single-sideband amplitude modulation with digital information using a subcarrier for automatic reception, with the subcarrier suppressed to a level less than 40 dB below peak power.

- The VHF band with standard test signal number 2 is: +6 dBmV.

1.4.7. Watchkeeping receiver (watchkeeping receiver)

A dedicated receiver for selective calling service, continuously monitoring distress frequencies DSC on the MF/HF band, frequency 2187.5 kHz on the MF band, and channel 70 (156.525 MHz) on the VHF band. On the MF/HF band, it is also known as a scanning receiver.

a.c

1.5. Abbreviations

Chapter 2. TECHNICAL PROVISIONS

2.1.2.1.2. Measurement Method

The EUT is placed in a room with normal temperature and relative humidity. The EUT and temperature control components must be turned on. The room temperature is then raised to 55°C ± 3°C and maintained during the measurement period from 10 to 16 hours.

At the end of the measurement period, the EUT must be tested for performance.

The room temperature must be maintained at +55°C ± 3°C throughout the performance testing period.

2.1.1. Vibration test

2.1.1.1. Definition

After completing the test, return the EUT to normal room temperature and relative humidity.

2.1.2.1.3. Requirements

2.1.2.2. Hot Test

2.1.2.2.1. Definition

This test determines the equipment's ability to operate under high temperature conditions.²);

2.1.2.2.2. Measurement Method².

The EUT is placed in a test room with normal temperature and relative humidity. The temperature is then increased to +40°C ± 2°C and the relative humidity raised to 93% ± 3% over a period of 3 hours ± 0.5 hours. These temperature and humidity conditions are maintained during the measurement period from 10 to 16 hours.

Climate control devices provided in the EUT are turned on at the end of the measurement period.

The EUT is turned on after about 30 minutes or after the manufacturer-specified time and must operate continuously for at least 2 hours. Performance testing must be conducted throughout this period.

Room temperature and relative humidity must be maintained throughout the measurement period.

At the end of the measurement period, the EUT is left in the room while the test room is returned to normal temperature within 1 hour.

After completing the test, return the EUT to normal room temperature and relative humidity.

2.1.2.2.3. Requirements

2.1.2.3. Low Temperature Test

2.2.11. Scanning efficiency

2.1.2.3.1. Definition

This test determines the equipment's ability to operate at low temperatures. 1^°CThis test also allows checking whether the equipment can start up in a low-temperature environment.

2.1.2.3.2. Measurement Method

The EUT is placed in a test room with normal temperature and relative humidity. The temperature is then lowered and maintained at -15°C ± 3°C for a cycle from 10 to 16 hours. Climate control devices in the EUT are turned on throughout the measurement period.

The EUT is turned on after about 30 minutes or after the manufacturer-specified time and must operate continuously for at least 2 hours. Performance testing must be conducted throughout this period.

Room temperature must be maintained at -15°C ± 3°C throughout the entire measurement period.

After completing the test, return the EUT to normal room temperature and relative humidity. 2.1.2.3.3. Requirements This test determines the ability of the device to operate under high temperature conditions.

2.1.2.2.2. Measurement method

Place the EUT in a test room with normal temperature and relative humidity. Then increase the temperature to +40 °C ± 2 °C and raise the relative humidity to 93% ± 3% within 3 hours ± 0.5 hours. These temperature and humidity conditions are maintained during the measurement period from 10 hours to 16 hours.

Climate control equipment provided in the EUT is turned on

at the end of the measurement period.

2.1.2.2.3. Requirements

Turn on the EUT after about 30 minutes or after the manufacturer's specified time and it must operate continuously for at least 2 hours. The EUT must be tested for performance throughout this period.rime Minister cm

The temperature and relative humidity of the test room must be maintained throughout the measurement period.

At the end of the measurement period, the EUT remains in the room, and the test room is returned to normal temperature within at least 1 hour. rime Minister cAfter completing the testing, return the EUT to normal room temperature and relative humidity.

2.1.2.2.3. Requirements

2.1.2.3. Low temperature test l2.1.2.3.1. Definition

This test determines the ability of the device to operate at low temperatures. lThis test also allows checking whether the device can start up in a low-temperature environment.

2.1.2.3.2. Measurement method

Place the EUT in a test room with normal temperature and relative humidity. Then reduce the temperature and maintain it at -15°C ± 3 °C for a cycle from 10 hours to

16 hours. Climate control equipment in the EUT is turned on throughout the measurement period.

Turn on the EUT after about 30 minutes or after the manufacturer's specified time and it must operate continuously for at least 2 hours. The EUT must be tested for performance throughout this period.

The temperature of the test room must be maintained at -15°C ± 3 °C throughout the entire measurement period.

2.1.2.2.3. Requirements

After completing the testing, return the EUT to normal room temperature and relative humidity.

2.1.2.3.3. Requirements

exposure to salt environments. The measurement cycle creates an increasing effect compared to service conditions.

°C and relative humidity between 90% - 95% for 7 days.

m x f

One of these two RF signals must have a nominal frequency corresponding to a frequency in the scanning frequency chain and equivalent to the standard test signal number 1 modulated for a DSC distress call.ì- Determine the symbol error rate at the output. Testing is performed under normal test conditions (section B.3, Annex B). When there is a false response, check the device's

4) Detailed information about the power source.

In addition, the device labeling may be displayed on the display screen.

The name and version of the installed software must be labeled or displayed on

the device or displayed through commands.

2.1.2.2.3. Requirements

2.1.2. Temperature test

This measurement does not need to be conducted if the manufacturer can provide sufficient evidence ensuring that the components, materials, and assembly of the equipment meet these requirements.

2.1.3.1. Definition

This measurement determines the ability of the equipment to maintain its characteristics without degradation when exposed to a salt environment. lcontact with a salt environment. The cycle of performing the measurement creates an increasing effect compared to service conditions.ANNEX I.A[31] If the name and version of the software are displayed on the screen, this information must also be included in the device's user manual.

2.1.3.2. Measurement Method

The EUT is placed in a measurement room and sprayed with a salt solution for 2 hours at normal temperature. The salt solution is mixed in a mass ratio of 5 ± 1% NaCl 95% and distilled water.

After the salt spray process ends, the EUT is placed in a room maintained at 40°C ± 2°C with relative humidity between 90% - 95% for 7 days. They can be programmed or printed out through external controllers.

The EUT must undergo four salt solution sprays, each lasting 2 hours, followed by storage for 7 days after each spray.

At the end of the entire measurement process, the EUT must be visually inspected, then performance tested.

2.1.3.3. Requirements

There should be no excessive damage or corrosion of the metallic parts of the equipment.

2.1.2.2.3. Requirements

2.3.1. Call sensitivity

2.1.3. Corrosion test

Unwanted emission from the receiver is radiation at any frequency by the equipment and antenna. The value of unwanted emission must be measured by the effective radiated power level including: Enclosure radiation and integrated equipment or with dedicated antennas.

The call sensitivity of the receiver lshall be such that, with a specified RF input signal level, the symbol error rate at the receiver output is less than or equal to 10^-2.

2.2.1.2. Measurement Method

The arrangement of test signals must comply with the provisions set out in Section B.5, Appendix B.

Input standard test signal number 1 (Section B.7.1) according to the frequencies specified in Section B.6.1, Appendix B:

- For MF, the input signal level is +5 dBmV under normal test conditions and +11 dBmV under limit test conditions;

- For HF, the input signal level is 0 dBmV under normal test conditions and +6 dBmV under limit test conditions.

The lsymbol error rate at the output is determined as described in Section B.8, Appendix B.

Measurements are performed under normal test conditions (see Section B.3) and under limit test conditions (see Sections B.4.1 and B.4.2 applied simultaneously).

For MF/HF equipment, measurements are repeated with standard test signal number 1 on the frequencies specified in Section B.6.2, Appendix B, only under normal test conditions.

The measurements must be repeated again with the input frequency set point ± 10 Hz for normal test conditions.

2.2.1.3. Limits

The symbol error rate must be less than or equal to 10^-2.

2.3.3. Co-channel interference rejection

2.2.2.1. Definition

Adjacent channel selectivity is defined as the suppression of an unwanted adjacent channel signal, expressed as the symbol error rate caused by unwanted signals at the demodulator output.

2.2.2.2. Measurement Method

The arrangement of test signals must comply with the provisions set out in Section B.5, Appendix B.

The desired RF signal must be standard test signal number 1 at the frequencies specified in Section B.6.1, Appendix B, and the desired signal level is 20 dBmV.

The unwanted signal input level is 60 dBmV.

The unwanted signal must be an unmodulated signal at a frequency of +500 Hz from the receiver's nominal frequency (central frequency).

The symbol error rate at the output is determined as described in Section B.8, Appendix B.

The measurement is repeated with the unwanted signal at a frequency of -500 Hz from the receiver's nominal frequency (central frequency).

The symbol error rate at the output is determined as described in Section B.8, Appendix B.

2.2.2.3. Limits

The symbol error rate must be less than or equal to 10^-2.

2.2. MF/HF receiver

2.2.3.1. Definition

Co-channel rejection is the ability of the receiver to obtain the desired signal when an unwanted signal is present, both signals being on the receiver's nominal frequency.

2.2.3.2. Measurement Method

The arrangement of test signals must comply with the provisions set out in Section B.5, Appendix B.

The desired signal is standard test signal number 1 at the frequencies specified in Section B.6.1, Appendix B, and the desired signal level must lbe 20 dBmV.

The unwanted signal must be an unmodulated signal.

The unwanted signal input level must be 14 dBmV.

The bit error rate at the output is determined as described in Section B.8, Appendix B.

2.2.3.3. Limits

The symbol error rate must be less than or equal to 10^-2.

2.3.5. Spurious response rejection

2.2.4.1. Definition

RF intermodulation response is defined as the suppression of intermodulation products generated from two unwanted signals at given signal levels and frequencies, expressed as the value at which the symbol error rate is 10^-2.

2.2.4.2. Measurement Method

The signals input to the receiver must be connected in accordance with the provisions set out in Section B.5, Appendix B.

The desired signal must be standard test signal number 1 at the corresponding frequency specified in Section B.6.1, Appendix B, and the desired signal level must lbe 20 dBmV.

Both unwanted signals are unmodulated signals and at the same level of +70 dBmV. Neither of these two signals is at a frequency closer than 30 kHz (combined frequencies may produce unwanted intermodulation products as detailed in ITU-R Recommendation SM.332-4.uThe symbol error rate at the output is determined as described in Section B.8, Appendix B.

2.2.4.3. Limits

2.2.5. Spurious Response

The symbol error rate must be less than or equal to 10^-2.

Spurious response is the ability of the receiver to distinguish between the desired signal and unwanted signals for frequencies outside the receiver bandwidth by ±3 kHz from the nominal frequency.

2.2.5.1. Definitions

2.2.5.2. Measurement Method

The manufacturer must provide the testing unit with information about the equipment as follows. Block diagram, signal connection structure.

If the equipment is constructed using heterodyne principles, the following information must be provided:

- The intermediate frequencies used;

- The internal oscillator frequencies used by the device;

- The arrangement of filters before the first frequency converter.

If the equipment uses analog-to-digital conversion technology, the following information must be provided:

- Direct sampling on the RF frequency or on the intermediate frequency;

- The sampling frequency used for conversion.

Arrange two test signals into the receiver input according to Section B.5.1. The AGC is in operation.

The desired signal is described as in Section B.7 applied to the appropriate frequency according to Section B.6.

The desired signal level is 20 dB

The unwanted signal level is 90 dBmV.

and is an unmodulated signal.mV The equipment must comply with frequencies in the range from 9 kHz to 2 GHz, excluding the ±3 kHz band around the assigned nominal frequency.

The formula below calculates the spurious frequencies, which can be used as guidance:

- For equipment using superheterodyne principles:

spurious

P_{= (1-n)/m}if x P_{- n/m} receive x P_{veANNEX I.A[31]m and n are integers within the range from -5 to +5.}

The spurious frequencies can be applied to all conversion frequencies (IF1, IF2,...).

- For equipment using analog-to-digital conversion techniques

receive

P_{= (1-n)/m} = P_{m -}/n/m x f A.1.8. Start-up time_{sample clock}

The spurious frequencies can be applied to all conversion frequencies (IF1, IF2,...).

- For devices using both heterodyne principles and digital technology simultaneously, the two formulas above need to be considered.

Determine the symbol error rate at the output.

The measurement is carried out under normal conditions (section B.3, Appendix B).

2.2.5.3. Limits

The symbol error rate must be less than or equal to 10^-2.

2.2.2. Adjacent channel selectivity

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.

Blocking is defined as the receiver's ability to distinguish between desired signals and undesired signals within the range from ±3 kHz to ±20 kHz relative to the assigned nominal frequency.

2.2.6.2. Measurement Method

Two test signals are arranged at the receiver input as specified in section B.5.1, Appendix B. The automatic gain control adjustment is in the operating state.

The desired signal is described as in section B.7, Appendix lB is put into use at the appropriate frequency following section B.6, Appendix B.

The unwanted signal level is 90 dBmV.

and is an unmodulated signal.mV and is an unmodulated signal.

The equipment operates within the frequency band from ±3 kHz to ±20 kHz relative to the assigned nominal frequency.

Measurement guidance:

- The undesired signal changes cyclically at 500 Hz.

- Determine the symbol error rate at the output.

- The measurement is carried out under normal test conditions (section B.3, Appendix B).

2.2.6.3. Limits

The symbol error rate must be less than or equal to 10^-2.

2.3.9. Spurious emission

2.2.7.1. Definition

The dynamic range of the device is the range of values from the minimum level to the maximum level of the radio frequency input signal, where the symbol error rate at the receiver output does not exceed the specified value.

2.2.7.2. Measurement Method

The signals introduced to the receiver input must be connected according to the provisions of section B.5, Appendix B.

Test signal number 1 on the appropriate frequency as specified in section B.6.1, Appendix B is applied to the receiver input. The level of the desired signal is 80 dB.mV.

The symbol error rate at the output is determined as described in section B.8, Appendix B.

NOTE: The symbol error rate under minimum signal level conditions follows the provisions of section 2.2.1.

2.2.7.3. Limits

The symbol error rate must be less than or equal to 10^-2.

2.2.3. Co-channel interference suppression

2.2.8.1. Definition

Spurious emissions leading to the antenna are components at any frequency generated in the receiver and led to the antenna output.

2.2.8.2. Measurement Method

The receiver input must be connected to a dummy antenna with a 50Ω impedance and spurious emissions are measured using selective measuring equipment. The effective value of the spurious emission components must be calculated.

The measurement must be performed across the frequency band from 9 kHz to 2 GHz.

The bandwidth of the selective analyzer is:

- 200 Hz in the frequency range from 9 kHz to 150 kHz;

- From 9 kHz to 10 kHz in the frequency range from 150 kHz to 30 MHz;

- From 100 kHz to 120 kHz in the frequency range from 30 MHz to 1 GHz;

- 1 MHz in the frequency range above 1 GHz.

The filter must be a peak filter.

2.2.8.3. Limits

The power of each spurious emission component shall not exceed 2 nW.

ANNEX B (REGULATIONS) Regulations on testing conditions

2.2.9.1. Definition

Spurious emissions of the transmitter are thec components radiated at any frequency caused by the housing and structure of the equipment.

2.2.9.2. Measurement Method

At a selected measurement position according to Appendix C, place the equipment on an insulated stand at a specified height on a non-conductive support and in a position close to the normal use position announced by the manufacturer.

Orient the test antenna in vertical polarization, the length of the test antenna is chosen corresponding to the instantaneous frequency of the receiver to be tested.

Connect the output of the test antenna to the receiver to be tested.

Turn on the receiver in the unmodulated mode, adjust the frequency of the receiver to be tested in the frequency range from 30 MHz to 2 GHz. The bandwidth of the receiver to be tested is applied as specified in clause 2.2.7.2. At each frequency where a spurious component is detected:

a. Adjust the height of the test antenna within the specified height range until the receiver receives the maximum signal level;

b. Then rotate the receiver 360° in the horizontal plane until the receiver receives the maximum signal level;

c. Record the maximum signal levelANNEX I.A[31] that the receiver receives;

d. Replace the receiver with a substitute antenna as in Appendix C;

e. Orient the substitute antenna in vertical polarization, adjust the length of the substitute antenna corresponding to the frequency of the detected spurious component;

f. Connect the substitute antenna to a calibrated signal generator;

g. Set the frequency of the calibrated signal generator to the frequency of the detected spurious component;

h. If necessary, adjust the input attenuation of the receiver being tested to lincrease the receiver sensitivity;

i. Adjust the height of the test antenna within the specified range to ensure receiving the maximum signal;

j. Adjust the input signal level of the substitute antenna so that the signal level indicated by the receiver matches the recorded signal level when measuring the spurious component, adjusted for the change in the input attenuation setting of the receiver;

k. Record the input level of the substitute antenna in terms of power, adjusted for the change in the input attenuation setting of the receiver;ANNEX I.A[31] I. Repeat the measurement with the test antenna orientation and the substitute antenna oriented for horizontal polarization;

The effective power of the spurious components is the higher of the two power levels of the spurious component recorded

m shall be used. at the input of the substitute antenna, adjusted for the antenna gain if necessary. again 2.2.9.3. Limits

The power of any spurious emission shall not exceed the value given in the table below

Table 1 - Limit Values for Spurious Emissions.

Frequency

2.2.4. Modulation transfer response

2.2.10.1. Definition

2.2.10.2. Measurement Method

Introduce an unmodulated RF test signal at a level of 30 V ≈ 150 dB

The signals input to the receiver must be connected in accordance with the provisions set out in Section B.5, Appendix B.

V rms at any frequency within the range from 100 kHz to 27.5 MHz to the receiver antenna input for a duration of 15 minutes. This signal is then removed and the EUT undergoes performance testing.m2.2.10.3. Limits

The receiver is not damaged and meets the requirements of the performance test.

Scanning performance is the ability of the receiver to accurately capture calls arriving before by more than 20 bits in a 200-bit sample and transmitted on a frequency while still performing scanning up to 6 frequencies ignoring all other signals and noise.

QCVN 97:2015/MIC was developed based on ETSI EN 301 033 V1.4.1 (2013-09) of the European Telecommunications Standards Institute (ETSI).

2.2.11.1. Definition

2.2.11.2. Measurement Method

Introduce two RF test signals at a level of 20 dB

V into the receiver.mOne of the two RF signals must have a nominal frequency corresponding to a frequency in the scanning frequency chain and equivalent to test signal number 1 modulated for a DSC distress call.

Additionally, the device must be constructed so that access to voltages can only be achieved using a tool for this purpose, such as a wrench or screwdriver, and warning labels must be displayed both inside and above the protective cover of the device.

The remaining RF signal must have a designated frequency corresponding to a different frequency that will be scanned and equivalent to the standard test signal number 1 modulated for DSC calls with a 20-bit dot pattern.

Emergency call sequences must be repeated after a random interval from 2.5 seconds to 4.0 seconds.

The receiver must be set up to scan the maximum number of frequencies for which the receiver is designed.

The number of emergency calls transmitted is 200 and the symbol error rate must be clearly defined.

2.2.11.3. Limits

The total number of emergency calls received must be equal to or greater than 95% of the total number of emergency calls transmitted and the symbol error rate must be less than or equal to 10.^-2.

2.2.5. False response rejection

MIC

2.3.1.1. Definition

The call sensitivity of the receiver is when with a specified RF input signal level, at which the symbol error rate at the receiver output is less than or equal to 10. lthan or equal to 10.^-2.

2.3.1.2. Measurement Method

The signals input to the receiver must be connected in accordance with the provisions set out in Section B.5, Appendix B.

Input the standard test signal number 2 into the receiver input (section B.7.2).

The symbol error rate at the output is determined according to section B.8, Appendix B.

The input signal level is 0 dBV under normal test conditions and +6 dBV under limit test conditions.mV under normal test conditions and +6 dBV under limit test conditions.mThe measurement must be performed under normal test conditions (according to section B.3) and under limit test conditions (sections B.4.1 and B.4.2 applied simultaneously).

The measurement must be

repeated under normal test conditions at carrier frequencies ±1.5 kHz. l2.3.1.3. Limits

Adjacent channel selectivity is a measure of the receiver's ability to obtain the desired modulated signal without exceeding the allowable attenuation due to the presence of an undesired modulated signal at a frequency offset of 25 kHz from the desired signal.

The symbol error rate must be less than or equal to 10^-2.

2.2.6. Blocking

2.3.2.1. Definition

2.3.2.2. Measurement Method

The input signals to the receiver input must be connected in accordance with the provisions of section B.5, Appendix B,

The desired signal must be the standard test signal number 2. The level of the desired signal is +3 dBV. The undesired signal must be modulated at 400 Hz with a deviation of ±3 kHz. The undesired signal must be tuned to the center frequency of adjacent channels.

The symbol error rate at the receiver output is determined as specified in section B.8, Appendix B. 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%;BmThe input value of the undesired signal is 73 dB.

The measurement must be repeated with the undesired signal tuned to the center frequency of the lower adjacent channel.

2.3.2.3. LimitsmV.

2.3.3.1. Definition

Co-channel interference suppression is a measure of the receiver's ability to obtain the desired modulated signal without exceeding the predetermined attenuation due to the presence of an undesired modulated signal, both signals being at the receiver's designated frequency.

The symbol error rate must be less than or equal to 10^-2.

regulation on shipborne watchkeeping receivers for reception of Digital Selective Calling operating in the MF, MF/HF and VHF bands of maritime mobile

2.3.3.2. Measurement Method

The desired signal must be the standard test signal number 2. The input level of the desired signal is +3 dBV. The undesired signal is a modulated signal at 400 Hz with a deviation of ±3 kHz. Both signals are fed into the receiver at the designated frequency and the measurement is

repeated when the undesired signal is shifted to ±3 kHz from the designated frequency.

The signals input to the receiver must be connected in accordance with the provisions set out in Section B.5, Appendix B.

The symbol error rate at the receiver output must be determined as per section B.8, Appendix B.mThe input level of the undesired signal is -5 dB. l2.3.3.3. Limits

Intermodulation response is a measure of the receiver's ability to obtain the desired modulated signal without exceeding the predetermined attenuation due to the presence of two or more undesired signals having specific frequency correlations relative to the

number of desired signals.mV.

2.3.4.2. Measurement Method

The symbol error rate must be less than or equal to 10^-2.

2.2.7. Dynamic range

Data is encoded in two-phase L as shown below:

The desired signal from generator A at the receiver's designated frequency must be the standard test signal number 2. The signal level of the desired signal is +3 dBV.ầAll undesired signals are fed in at the same level. The undesired signal from generator B is an unmodulated signal and is adjusted to a frequency higher (or lower) by 50 kHz from the receiver's designated frequency. The second undesired signal from generator C is a modulated signal at 400 Hz with a deviation of ±3 kHz and is adjusted to a frequency higher (or lower) by 100 kHz from the receiver's designated frequency.

2.3.4The input level of the undesired signals is 68 dB.

The signals input to the receiver must be connected in accordance with the provisions set out in Section B.5, Appendix B.

2.3.4.3. LimitsmV.

Image rejection is the receiver's ability to distinguish between the desired signal and undesired signals for frequencies outside the receiver's bandwidth.

Intermodulation response is a measure of the receiver's ability to obtain the desired modulated signal without exceeding the predetermined attenuation due to the presence of two or more undesired signals having specific frequency correlations relative to the

2.3.5.2. Measurement MethodmV.

If the device uses analog-to-digital conversion technology, the following information must be displayed:

The symbol error rate must be less than or equal to 10^-2.

This standard specifies technical requirements for direct calling receivers operating on MF, MF/HF, and VHF bands allocated in the national radio frequency spectrum planning for maritime mobile services.

The carrier wave is phase-modulated with peak values of (+1.1 ± 0.1) rad and (-1.1 ± 0.1) rad relative to the unmodulated carrier wave.

Arrange two test signals into the receiver input according to section B.5.1.

The desired signal level

If the equipment is constructed using heterodyne principles, the following information must be provided:

- The intermediate frequencies used;

- The internal oscillator frequencies used by the device;

- The arrangement of filters before the first frequency converter.

If the equipment uses analog-to-digital conversion technology, the following information must be provided:

is 3 dBV.

- The sampling frequency used for conversion.

Arrange two test signals into the receiver input according to Section B.5.1. The AGC is in operation.

The undesired signal level is 73 dB.

The desired signal level is 20 dB

The equipment must comply with frequencies in the range from 9 kHz to 2 GHz, except for lthe receiver's IF band and adjacent channels.mV.

n/m xmV The equipment must comply with frequencies in the range from 9 kHz to 2 GHz, excluding the ±3 kHz band around the assigned nominal frequency.

Image rejection frequencies can be applied to all conversion frequencies (IF1, kF2,...).

- For equipment using superheterodyne principles:

spurious

P_{= (1-n)/m} if x P_{ANNEX I.A[31]P} - - For devices using P_{m -}

The spurious frequencies can be applied to all conversion frequencies (IF1, IF2,...).

analog-to-digital Iconversion

= f sample clock

P_{= (1-n)/m} 2.3.5.3. Limits_{m -}/n/m x f A.1.8. Start-up time_{Blocking is defined as the receiver's ability to distinguish between the desired signal and the undesired signal within the range of ±1 MHz to ±10 MHz from the assigned designated frequency. 2.3.6.2. Measurement Method}

The spurious frequencies can be applied to all conversion frequencies (IF1, IF2,...).

- For devices using both heterodyne principles and digital technology simultaneously, the two formulas above need to be considered.

Determine the symbol error rate at the output.

The measurement is carried out under normal conditions (section B.3, Appendix B).

Arrange two test signals to the receiver input as per section B.5.1, Appendix B.

The symbol error rate must be less than or equal to 10^-2.

2.2.8. Spurious emissions to antenna port

It is the ratio that the modulator and transmitter for the 406.0 MHz to 406.1 MHz band must be capable of meeting all requirements without damage due to open or short circuit loads, except for the output power requirements.

The desired signal described in section B.7, Appendix B is fed in using the appropriate frequency according to section B.6, Appendix B.

The desired signal level is 3 dBV.

The undesired signal level is 93 dB.

The equipment operates within the frequency range from ±1 MHz to ±10 MHz from the assigned designated frequency.

- Determine the symbol error rate at the output.mV.

Testing is conducted under normal test conditions (section B.3, Appendix B).mV The equipment must comply with frequencies in the range from 9 kHz to 2 GHz, excluding the ±3 kHz band around the assigned nominal frequency.

When image rejection occurs, it is considered

Measurement guidance:

- The undesired signal changes cyclically at 500 Hz.

A.2. Frequency operation and receiving mode requirements

- A.2.2. Receiving mode

A.2.3. Scanning receiver again Section 2.3.5.

2.3.6.3. Limitations

The symbol error rate must be less than or equal to 10^-2.

For integrated equipment, this standard specifies requirements and measurement methods only for the direct calling receiver part.

The PLB buoy must be designed to limit accidental continuous transmission of signals on the 406.0 MHz to 406.1 MHz band for more than 45 seconds.

The dynamic range of the equipment is the range from the minimum to the maximum level of the radio frequency input signal, at which the symbol error rate at the receiver output does not exceed the specified value.

2.3.7.2. Measurement Method

The signals input to the receiver must be connected in accordance with the provisions set out in Section B.5, Appendix B.

Input standard test signal number 2 into the receiver's input. The desired signal level is 80 dB.mV.

Intermodulation response is a measure of the receiver's ability to obtain the desired modulated signal without exceeding the predetermined attenuation due to the presence of two or more undesired signals having specific frequency correlations relative to the

2.3.7.3. Limitations

The symbol error rate must be less than or equal to 10^-2.

2.2.9. Spurious emissions radiated

As stipulated in Section 2.2.8.

ITU-T Recommendation E.161 (2001): "Arrangement of digits, letters and symbols on telephones and other devices that can be used for gaining access to a telephone network".

As stipulated in Section 2.2.9.

3. MANAGEMENT PROVISIONS

Direct calling watch receivers operating on MF, MF/HF, and VHF bands in maritime mobile services within the scope of Article 1.1 must comply with the technical requirements set forth in this Standard.

4. RESPONSIBILITIES OF ORGANIZATIONS AND INDIVIDUALS

Relevant organizations and individuals have the responsibility to implement certification and declaration of conformity for direct calling watch receivers operating on MF, MF/HF, and VHF bands in maritime mobile services and are subject to inspection by state management agencies according to current regulations.

Chapter 5. ORGANIZATION OF IMPLEMENTATION

5.1. The Telecommunications Administration and Provincial Departments of Information and Communications are responsible for organizing guidance and managing radio equipment in accordance with this Standard.

5.2. In case there are changes, additions, or replacements to the provisions stated in this Standard, they shall be implemented according to the new document.

 

 

ANNEX A

Product Name, Goods According to QCVN

General Requirements for Direct Calling Watch Receivers

A.1. General Requirements

A.1.1. Structure

A.1.1.1. CGeneral Structure

The device must be constructed to continuously monitor the corresponding DSC frequencies and meet operational conditions (Section A.2.1).

A.1.1.2. Design

Mechanical and electrical design structure, lComplete assembly of the equipment must meet practical technical conditions, the equipment must be suitable for use on ships.

The equipment must be designed to operate continuously.

A.1.1.3. Accessibility

All parts of the equipment that need adjustment during testing and maintenance must be easily accessible.

Parts of the equipment must be identifiable through markings inside the equipment or instructions in technical documentation.

A.1.1.4. Calibration and Maintenance

Equipment must be built with aof the Government stipulating functions, tasks, powers, and organizational structure of the Ministry of Home Affairsstructure allowing major functional blocks to be easily replaced and put back into operation without complex recalibration or adjustment procedures.

A.1.1.5. Protection amendAntenna from static electricity ;

There must be a direct current path from the antenna terminal to ground with impedance not exceeding 100 kΩ- Electronic Information Portal to protect against damage caused by static electricity that may appear at the receiver input.

A.1.1.6. Numeric Keypad

In the case where the numeric keypad only includes digits from "0" to "9", the digit keys must be arranged according to ITU-T E.161 recommendations.

In the case where the keypad uses alphanumeric characters as in office machines and data processing equipment, the digit keys from "0" to "9" may be arranged according to ISO 3791 standards.

A.1.2. Requirements for Indicators and Controls

A.1.2.1. General Introduction

The number of controls, design, and operation functions, layout, arrangement, and size must ensure simple, quick, and effective operation. All common control functions must be easily performed and arranged to minimize accidental activation risks.amendA.1.2.2. Identification

All controls and indicators must be easily recognizable and readable at the operating position.

Indicators and controls must be displayed in English. Supplementary symbols according to IEC 60417 may be used.

A.1.2.3. Prevention of Incorrect Adjustment

Control functions unnecessary for normal operation must not be easily accessed.

Control functions that could unintentionally lead to turning off the equipment, reducing performance, or causing unclear fault indications must be protected to prevent unwanted operations.

A.1.2.4. LightingpoliciesControls and indicators must be provided with sufficient lighting to allow identification of controls and ease of reading indicators at all times; the lighting equipment must have a dimming function down to complete darkness.

A.1.2.5. Operation

Equipment must be designed to ensure that control errors do not cause injury to people.

A.1.3. Software

All operational software integrated into the equipment must be protected.development Any necessary software in the equipment to facilitate operation, including initial or reactivation, must be permanently installed in the equipment so that users cannot access this software.

There must be a tool to perform periodic monitoring of equipment operation and capable of triggering alerts or signals in case of faults, the equipment will not automatically recover.

All these processes must be reflected in the manufacturer's user manual.

A.1.4. Memory

Pre-programmed DSC distress call frequencies and information related to equipment operation must be stored in fixed memory units. Equipment containing information in operational programmable memory must be powered to allow continuous operation for at least 10 hours.A.1.5. Interfaces (for non-integrated devices)

Other interfaces besides those described in Sections A.1.5.1 and A.1.5.2 may be provided but must not reduce the quality of the equipment.

A.1.5.1. Audio Frequencyớ Unearthed output terminal 600 Ω (0 dBm ± 3 dB).

A.1.5.2. Serial Interface

Control interface:

- Stop/Start signal following Recommendation ITU-T V.11, and/or

- Interface for controlling or reading the frequency of a scanning receiver in compliance with IEC 61162-1.

C, amended and supplemented by Decree No. 109/2025/NĐ-CP and Decree No. 193/2025/NĐ-CPA.1.6. Labeling and Identification

Each component of the equipment must be labeled externally with clear visible information:No.

1) Manufacturer identification;

2) Equipment type name or identification mark;

3) Equipment serial number;

4) Detailed power supply information.

Additionally, equipment labeling may be displayed on the display screen.

The name and version of the installed software must be labeled or displayed on

the equipment or shown through commands.đượ Or FIDO

If the name and version of the software are displayed on the screen, this information must also be included in the equipment's user guide.l Other HF DSC distress frequencies listed in section A.2.1 may be added to enable the device to scan up to 6 frequencies in a scanning cycle.

Frequency information

The selected receiver frequency must be easily identifiable.

under normal conditions as well as under limit test conditions. falls within the following range:

Relative humidity: from 20%

For fixed frequency receivers, the specific frequencies or DSC channels that the device can operate on must be clearly marked. For programmable scanning receivers, they must have a function to display the scanned frequencies or print them through an external controller.đượ Defined temperature. The sequence of measurements chosen and the humidity in the test room are controlled so that there is no excessive condensation.

A.1.7. User Documentation

Information must be provided sufficiently to ensure proper operation and maintenance of the equipment.

The documentation for service usage and operation must:

- Be written in at least Vietnamese and English;

- Indicate that the devices are capable of withstanding weather effects; organize credit institutions, foreign bank branches are responsible for organizing the implementation of this Circular.- In cases where the equipment is designed to diagnose and repair individual components, the instructions must provide complete circuit diagrams, component layouts, and parts lists;

- In cases where the equipment includes complex module blocks that cannot be diagnosed or repaired individually, the instructions must contain sufficient information to allow identification, recognition, and replacement of faulty complex module blocks. Other separate components without modular structure must also meet these requirements.ỗand repair each component, the instructions must provide complete circuit diagrams, component layout, and a list of components;

A.1.8. Start-up Timeì The equipment must be operational within one minute from power-on.

A.1.8. Start-up time

A.1.9. Safety Measures

Overvoltage and Overcurrent

.1.9.1. Measures must be implemented to protect the equipment from the effects of overvoltage, overcurrent, or reversed polarity or phase sequence.

A.1.9.2. Grounding

The metallic casing of the equipment must be grounded but the ends of the power supply must not touch ground.

A.1.9.3.

Contact Protection Random contact with dangerous voltages must be prevented as much as possible. All parts and conductors of direct current, alternating current, or both (except radio frequency voltage) when combined produce a peak voltage

exceeding 50 V must be protected against accidental contact and must be automatically isolated from all power sources when the housing is opened. Additionally, the equipment must be constructed so that access to these voltages can only be achieved using a tool intended for this purpose, such as a screwdriver or wrench, and warning labels must be displayed both inside and on top of the protective housing of the equipment.

Additionally, the equipment must be constructed such that access to live voltages can only be achieved using a tool for this purpose, such as a wrench or screwdriver, and warning labels must be displayed both inside and on top of the protective cover of the equipment.

A.1.9.4. Safe Distance from Compass

The safe distance from the compass standard must be described on the equipment or in the user manual.

A.2. Operating frequency requirements and reception modes

A.2. Operating Frequency Requirements and Reception Modes

A.2.1. Channels and Frequency Bands

- The equipment may be designed as a single-frequency receiver, multi-frequency receiver, or scanning receiver in one or more of the following bands: - MF: 1,606.5 kHz

4,000 kHz;

- HF: 4 MHz - 27.5 MHz; - - VHF: 156 MHz

174 MHz.

MF/HF DSC receiver frequencies must be designed within the specified frequency range.ANNEX I.A[31] MF/HF DSC receiver frequencies for safety, emergency, and rescue services differ from those used for regular communications.

MF/HF frequencies for DSC distress calls include:

- 2,187.5 kHz;

- 4,207.5 kHz;

- 6,312 kHz;

- 8,414.5 kHz;

- 12,577 kHz;

- 16,804.5 kHz.

Other MF/HF frequencies not listed above may also be used for regular communications.

The MF band DSC direct-reception receiver for distress call, emergency, and safety services must be a single-frequency receiver set at 2,187.5 kHz.

The MF/HF scanning receiver must be designed to scan six frequencies for DSC distress calls or for regular DSC communications.

If the scanning mode for DSC distress calls can be customized by the operator, the equipment must scan at least three distress frequencies, including two mandatory bands: 2 MHz and 8 MHz (see recommendation ITU-T M.541-9, Appendix 1, Clause 3.1.3.2).

When used for regular communication purposes, the MF or MF/HF direct-reception frequency receiver may have the capability to receive DSC signals in the MF/HF band as detailed in the ITU Radio Regulations.

On the VHF band, distress, emergency, and safety calls as well as regular communication calls using channel 70 (156.525 MHz) are made.

The VHF direct-reception frequency receiver for distress, emergency, and safety calls must be a single-frequency receiver set on channel 70. For regular communication, the VHF direct-reception receiver may be switched to other channels according to Appendix 18 of the ITU Radio Regulations.

A.2.2. Reception mode

A.2.2. Reception Mode lThe MF/HF band DSC signal receiving equipment must receive the F1B or J2B type of emission. The VHF band DSC signal receiving equipment must receive the G2B type of emission.

A.2.3. Scanning receiver

A.2.3. Scanning Receiver

A.2.3.1. Scanning CycleamendAn MF/HF scanning receiver must be able to complete a scanning cycle within 2 seconds.

A.2.3.2. Scanning Frequency

A direct-reception scanning frequency receiver must be able to scan two frequencies separately: scanning DSC distress frequencies or scanning DSC frequencies for regular communications.

A.2.3.2.1. Distress DSC Frequencies

When in the DSC distress frequency scanning mode, the direct-reception receiver must scan the frequencies 2,187.5 kHz and 8,414.5 kHz and at least one additional HF DSC distress frequency as listed in Section A.2.1.June 2024;Additional HF DSC distress frequencies listed in Section A.2.1 may be added to enable the equipment to scan up to six frequencies in a single scanning cycle.

The additional HF distress DSC frequencies listed in Section A.2.1 may be included to enable the equipment to scan up to six frequencies in a scanning cycle.

A.2.3.2.2. Regular Communication DSC Frequencies

When in the DSC MF and HF regular communication frequency scanning mode, the direct-reception receiver may scan any regular communication frequency, up to six frequencies in a single scanning cycle.

A.2.3.3. Stop/Start Scanning Process

The scanning frequency receiver must provide a method to stop and start the scanning process under the control of an external DSC decoder/encoder. Control signals for stopping and starting must comply with recommendationANNEX I.A[31] TU-T V.11. Installation The stop signal has a logic level "0" and the start signal has a logic level "1". IStop and start scanning signals may be replaced by directly setting the scanning receiver frequency through a DSC device using the IEC 61162-1 protocol.

The MF/HF receiver must provide a method to transmit information about the frequency or channel to the DSC controller using the IEC 61162-1 protocol once scanning has stopped.

A.2.3.4.

Frequency Information

The selected frequency of the receiver must be easily identifiable. Frequency information

The selected receiver frequency must be easily identifiable.

Information on frequency or channel usage following the scanning process must be transmitted automatically and displayed on external installation equipment (typically an independent DSC device). The interface used during data transmission complies with IEC 61162-1.

 

 

ANNEX B

Product Name, Goods According to QCVN

Measurement Conditions Provisions

B.1. General Requirements

Measurement tests must be conducted under normal measurement conditions as well as limit measurement conditions.ìunder normal conditions as well as during limit testing.

B.2. Measurement Power Supply

During measurement, the device must be powered from a measurement power supply capable of generating normal voltage and limit voltage as specified in Sections B.3.2 and B.4.2.

The voltage of the power supply must be measured at the power input terminal of the device.

If the device uses a direct power cord connection, the measurement voltage will be measured at the point where the power cord connects to the device.

Throughout the measurement period, the power supply voltage must remain within the allowable deviation range of ±3% compared to the initial voltage at the start of each test.

B.3. Normal Measurement Conditions

B.3.1. Standard Measurement Temperature and Humidity

The standard measurement temperature and humidity must simultaneously fall within the following ranges:ANNEX I.A[31] within the following range:

- Temperature: from +15°C to +35°C; ÷ +35 °C;

- Relative humidity: from 20% rime Minister crelative humidity: from 20% ÷ 75 %.

B.3.2. Normal Measurement Power Supply

B.3.2.1. AC Frequency and Voltage

The normal measurement voltage for devices connected to an AC power source must be the published voltage or one of the design voltages of the device.

The frequency of the measurement power supply must be 50 Hz ± 1 Hz.

B.3.2.2. Secondary Battery Power Supply

In cases where the device is designed to operate using a battery power supply, the normal measurement voltage must be the nominal voltage of the battery (12 V, 24 V, etc.).

B.3.2.3. Other Power Supplies

When operating with other power supplies, the standard measurement voltage must be defined by the manufacturer.

B.4. Limit Measurement Conditions

B.4.1. Limit Temperature Measurement

When measuring at limit temperatures, measurements must be performed at temperatures below -15 °C and above 55 °C.

Prior to conducting measurements, the device must reach the measurement room temperature. The device must be turned off throughout the temperature stabilization period. The sequence of measurements and humidity control in the measurement room must be such that excessive condensation does not occur. , amended and supplemented by Decree No. 109/2025/NĐ-CP and Decree No. 193/2025/NĐ-CPtemperature controlled. The sequence of measurements and the room humidity are controlled to prevent excessive condensation.

B.4.2. Limit Values of Measurement Power Supply

B.4.2.1. AC Frequency and Voltage

The limit measurement voltage for devices connected to an AC power supply: standard voltage ±10%.

The frequency of the measurement power supply: 50 Hz ± 1 Hz.ồFrequency measurement: 50 Hz ± 1 Hz.

B.4.2.2. Secondary Battery Power Supply

For devices designed to operate using a secondary battery power supply, the limit measurement voltage is 1.3 and 0.9 times the nominal voltage of the battery (12 V, 24 V, etc.).

\B.4.2.3. Other Power Supplies

When operating with other power supplies, the limit measurement voltage must be defined by the manufacturer.

B.5. Connecting Measurement Signal to Receiver

To perform measurements, the receiver must be connected to a measurement signal source with an input impedance of 50 - Electronic Information Portal. Within the frequency range from 1 606.5 kHz to 4 000 kHz, a network consisting of a 10 - Electronic Information Portal resistor in series with a 250 pF capacitor may be used as required by the manufacturer.

The arrangement of components used must be described in the measurement report."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." NOTE: This does not mean that the receiver can only function properly with antennas having higher impedances.

NOTE: This does not mean that the receiver can only operate well with an antenna having an impedance above this.

B.5.1. Measurement Signal Source

Measurement signals must be connected through a network as specified above. This requirement must be met regardless of whether one, two, or more measurement signals are simultaneously delivered to the receiver. In the case of multiple measurement signals, steps must be taken to prevent unwanted effects due to interactions between signals in the signal generation sources or other sources.

B.5.2. Signal Level

The input signal level of the measurement signal is clearly indicated by the electromotive force (e.m.f.) value at the output of the signal generator source including all accompanying connections.

B.6. Measurement Frequencies

B.6.1. Measurement Frequencies

Default measurement frequencies are:

- MF Band: 2 187.5 kHz or 2 177 kHz;ầ- HF Band: 8 414.5 kHz or 8 436.5 kHz;

- VHF Band: 156.525 MHz (Channel 70).

B.6.2. Additional Measurement Frequencies for HF Equipment

Additional measurement frequencies for HF equipment:

- For equipment intended for search and rescue/safety purposes, the measurement frequencies are the following DSC search and rescue/safety frequencies: 4 207.5 kHz, 6 312 kHz, 12 577 kHz, and 16 804.5 kHz applicable to the receiving band of the equipment (see Section A.2.1, Appendix A);

- For equipment not intended for search and rescue and safety purposes, the measurement frequencies are any DSC frequency within each of the following bands: 4 MHz, 6 MHz, 12 MHz, 16 MHz, 18 MHz, 22 MHz, and 26 MHz applicable to the receiving band of the equipment. B.7. Measurement Signals A standard measurement signal includes a series of identified calls, each call comprising a number of information symbols (format specification, address, and category). Calls follow Recommendation ITU-R M.493-13.

B.7.1. Standard Measurement Signal Number 1

Standard measurement signal number 1 for direct-printing DSC MF/HF receivers is a signal at the designated DSC number of the receiver, with a frequency deviation of ±85 Hz, modulated by various types of DSC signals with a modulation rate of 100 baud. These signals must be generated by calibrated equipment.

B.7.2. Standard Measurement Signal Number 2aStandard measurement signal number 2 is a signal at the designated DSC frequency of the receiver, phase-modulated with a modulation index of 2.0. The modulating signal must have a designated frequency of 1 700 Hz and a frequency deviation of ±400 Hz, modulated with various types of DSC signals with a modulation rate of 1 200 baud. The signal must be generated by calibrated equipment.

B.8. Bit Error Rate MeasurementNo. 1

T"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."Devices incorporating a DSC decoder are evaluated based on the symbol error rate (SER). A series of decoded DSC calls using pre-correction techniques, interleaving, and integrity check information are divided into blocks, each block corresponding to an information symbol in the received signal. The ratio of the number of erroneous blocks to the total number of blocks is determined as the symbol error rate.

When performing measurements for digital-output receivers, all measurements must be conducted through bit error rate measurements at the output.

NOTE: The IMO Resolution defines the term character error ratio (CER). In this standard, symbol error rate measurements correspond to the character error ratio requirements of IMO.无效 Modulation factor: 2.0. The modulated signal must have a nominal frequency of 1 700 Hz and be shifted ±400 Hz, modulated with various DSC signal types at a modulation rate of 1 200 baud. The signal must be generated using calibrated equipment.

B.8. Measurement of error ratio kintention of

Integrated DSC decoding devices are evaluated based on the symbol error rate (SER). A series of decoded DSC calls using pre-error correction techniques, interleaving, and integrity check information are divided into blocks, each block corresponding to a symbol in the received signal. The ratio between the number of erroneous blocks and the total number of blocks is determined as the symbol error rate.

When testing receivers with digital outputs, all measurements must be performed through the symbol error rate at the output.

NOTE: The IMO Resolution introduces the term character error ratio (CER). In this standard, the symbol error rate measurements correspond to the CER requirements of IMO.

B.9. Measurement Uncertainty and Explanation of Measurement Results

B.9.1. Measurement Uncertainty

Table 2 - ValuescouncillORS error 10. Heads of units under the Ministry are responsible before the Minister for implementing Resolution No. 13/2002/NQ-CP dated November 19, 2002 of the Government, as well as managing cadres, workers, and employees under their jurisdiction to strictly adhere to traffic laws and regulations and this Directive.minimum forớvarious Actual status of operation of equipment

For the measurement methods according to this standard, the measurement uncertainty has a reliability of up to 95%, as described in TR 100 028-1.

B.9.2. Explanation of Measurement Results

The explanation of the results recorded in the measurement report for the measurements in this document must meet the following requirements:

- The measured value related to the corresponding limit will be used to determine whether the equipment meets the requirements of the standard;

- The measurement uncertainty value of each parameter must be recorded in the measurement report;

- The measurement uncertainty values must be less than or equal to the parameter values listed in Table 2.n lFor the measurement methods according to this standard, the table recording measurement uncertainty must be calculated according to TR 100 028-1 and must correspond to an exponent factor, k = 1,96 or k = 2 (with a reliability of 95% and 95,45% respectively in the case where the actual distribution of measurement uncertainty is Gaussian).

C.1. Measurement Position and General Layout for Measurements Related to Radiation Fields

 

 

ANNEX C

Product Name, Goods According to QCVN

Radiation measurements

C.1.1. Outdoor Measurement Position

CThe outdoor measurement position must be on a suitable surface or on a ground plane. At a point on the measurement position, the base plane must have a minimum diameter of 5 m. In the center of the base plane, there is a non-conductive support pole that can rotate 360° horizontally, used to support the test sample at a height of 1.5 m above the base plane. The measurement position must be wide enough to allow the erection of a transmitting antenna or measurement at a distance of 2 or 3 m (selecting the larger value). The actual distance must be recorded along with the measurement results conducted at that position. Measures must be taken to ensure that reflections from external barriers and reflections from the base plane do not affect the measurement results.

Figure C.1 - Outdoor Measurement Position lNOTE: l/1. Measured equipment.

2. Measurement antenna.

3. High-pass filter (in the case of strong Tx radiation).

4. Spectrum analyzer, or measurement receiver.

C.1.2. Measurement Antenna

2. AThe measurement antenna is used to receive radiations from the test sample and substitute antennas when using the measurement position for radiation measurements; if necessary, it is used as a transmitting antenna when using the measurement position for receiver characteristic measurements.

This antenna is mounted on a support pole that allows the antenna to be used in vertical or horizontal polarization, and the height of the antenna above the base can be changed within a range of 1 m to 4 m. It is best to use a directional measurement antenna. The size of the measurement antenna along the measurement axes must not exceed 20% of the measurement distance.nationalFor radiation measurements from receivers and transmitters, connect the measurement antenna to the measurement receiver, which has the ability to detect any frequency under investigation, and accurately measure the relative level of the signal at its input. For receiver sensitivity measurements, connect the measurement antenna to the signal generator.n lC.1.3. Substitute Antenna

When performing measurements up to 1 GHz, the substitute antenna must be a dual-pole /2, resonant at the operating frequency, or a shorter dual-pole calibrated to be equivalent to a dual-pole /2. When measurements are performed above 4 GHz, a horn radiator must be used. For measurements between 1 GHz and 4 GHz, either a horn radiator or a dual-pole /2 can be used. The center of this antenna must coincide with the reference point of the test sample. This reference point must be the center of the test sample when its antenna is mounted inside the housing, or the point where the external antenna is connected to the housing.

CThe distance between the bottom end of the dual-pole and the base plane must not be less than 0.3 m.

The substitute antenna must be connected to a calibrated signal generator when the measurement position is used to measure spurious emissions and effective transmission power. The substitute antenna must be connected to a calibrated measurement receiver when the measurement position is used to measure receiver sensitivity.

The signal generator and receiver must operate at the frequencies to be measured and must be connected to the antenna through appropriate balanced and matching circuits. NOTE: The gain of a typical horn antenna is represented equivalently to an isotropic radiator.

C.1.4. Additional Optional Indoor Measurement Position

CWhen the signal frequency being measured exceeds 80 MHz, the measurement may be carried out at an indoor measurement position. If this position is used, it must be clearly noted in the measurement report.

The measurement position may be a laboratory with a minimum area of 6m x 7m and a minimum height of 2.7 m. lIn addition to the measuring equipment and operator, the measurement room should be as open as possible to avoid reflective objects except for walls, ceiling, and floor. lReflections from the wall behind the measured equipment must be reduced by placing a metal absorber panel in front of the wall. lFor horizontal polarization measurements, corner reflectors placed around the measurement receiver antenna are used to reduce the reflection effect from the opposite wall and from the ceiling and floor. Similarly, for vertical polarization measurements, corner reflectors are used to reduce the reflection effect from the side walls. With lower frequency bands (below approximately 175 MHz), there are no corner reflectors or absorber panels. For experimental reasons, a /2 antenna may be replaced by a fixed-length antenna, such that its length is within the range of /4 to /2 at the measured frequency and with a sufficiently sensitive measurement system. By the same token, the distance from 2 to the top may vary. lThe measurement antenna, measurement receiver, substitute antenna, and calibrated signal generator are used in the same manner as in the conventional method. To ensure that no errors occur due to the wave path approaching the point where the phase cancellation occurs between the direct signal and the remaining reflected signals, the substitute antenna must be moved by ±0.1 mm in the direction of the measurement antenna as well as in two directions perpendicular to the initial direction.

The distance between the lower end of the dipole and the ground plane must not be less than 0.3 m.

Replacement antennas must be connected to a calibrated signal generator when the test position is used.development False emission measurements and effective radiated power of the transmitter. Replacement antennas must be connected to a calibrated receiver when the test position is used for receiver sensitivity measurements.

The signal generator and receiver must operate at the frequencies to be measured and must be connected to the antenna via appropriate balanced and matching circuits.

NOTE: The gain of a typical loudspeaker antenna is represented relative to an isotropic radiator.amendThe performance of a typical speaker antenna is represented corresponding to an isotropic radiator.

C.1.4. Optional indoor test positions

When the signal frequency being measured exceeds 80 MHz, the measurement may be carried out at an indoor test position. If this test position is used, it must be clearly noted in the test report. Testing.

The test position may be a laboratory with a minimum area of 6m x 7m and a minimum height of 2.7 m.

Apart from the measuring equipment and operator, the test room should be as open as possible to avoid reflective objects except for walls, ceiling, and floor.

Reflections from the wall behind the measured device must be reduced by placing a metal absorber panel in front of the wall. incoming calls to landline phones For horizontal polarization measurements, corner reflectors placed around the receiving antenna are used to reduce the reflection effects from the opposite wall and from the ceiling and floor. Similarly, for vertical polarization measurements, corner reflectors are used to reduce reflection effects from side walls. At lower frequency bands (below approximately 175 MHz), there are no corner reflectors or absorber panels.of the Government stipulating functions, tasks, powers, and organizational structure of the Ministry of Home Affairsapproximately 175 MHz), notầwith corner reflectors or absorber panels. For experimental reasons, the antenna l/2 may be replaced by a fixed-length antenna, such that its length is within the range of l/4 to l at the measured frequency and with a sufficiently sensitive measurement system. By the same method, the distance l/2 to the top may vary.

Test antennas, test receivers, replacement antennas, and calibrated signal generators are used in the same manner as in the conventional method. To ensure that no errors occur due to wave propagation paths close to points where phase cancellation occurs between the direct signal and remaining reflected signals, replacement antennas must be moved by ±0.1 mm along the direction of the test antenna as well as in two directions perpendicular to the initial direction.policies Changing the height mentioned above is not necessary.

If changes in the aforementioned distance cause the signal level to change by more than 2 dB, the test sample must be repositioned until the signal level change drops below 2 dB.

Figure C.2 - Positioning for indoor measurements

C.2. Guidance on using measurement positions for radiation

For measurements related to the use of radiation fields, measurement positions according to the requirements set out in Section C.1 may be used. When using such measurement positions, the following conditions must be monitored to ensure the stability of the measurement results.

CC.2.1 Measurement Distance

Experimental measurements show that the measurement distance is not a decisive condition and does not significantly affect the measurement results provided that this distance is not less than l/2 at the measurement frequency and with the considerations in this annex. Typically, measurement rooms use measurement distances of 3 m, 5 m, 10 m and 30 m.

CC.2.2 Test Antennas

Different types of test antennas can be used because performing alternative measurements reduces error effects in the measurement results.

Changing the height of the test antenna within the range from 1 m to 4 m is a necessary condition to find the maximum radiation point.

For low frequencies below about 100 MHz, changing the height mentioned above is unnecessary.ì y, details about the type of antenna must accompany the measurement results. Attention must be paid to correction factors when using short dipole receiving antennas.

CC.2.3 Substitute Antennas

When using different types amendof substitute antennas at frequencies lower than approximately 80 MHz, the measurement results may differ.

When using shortened dipole antennas at these frequencies, details about the antenna type must accompany the measurement results. Attention must be paid to calibration factors when using shortened dipole antennas.to, it is necessary to reduce radiation from this cable, for example, by using a ferrite core or a double-shielded cable.

CC.2.4 Dummy Antennas

In radiation measurements, the size of amendthe dummy antenna must be smaller than the sample being tested.

Where possible, the dummy antenna should be directly connected to the sample being tested.

In cases where cables are required, it is necessary to reduce radiation from the cable, for example, by using ferrite cores or double-shielded cables.ANNEX I.A[31]The acoustic tube must have an appropriate length. The acoustic tube must have an internal diameter of 6 mm and a thickness of 1.5 mm. A plastic funnel with a diameter corresponding to the speaker of the receiver must be attached directly in front of the receiver's speaker. The plastic funnel must ensure flexibility at the point of attachment to the receiver to prevent mechanical resonance. The small end of the funnel must be connected to one end of the acoustic tube, and the microphone is connected to the other end.

CC.2.5 Coaxial Cables

The position of auxiliary cables (for example, power cables, microphone cables...) when not separated may affectANNEX I.A[31] the measurement results. To obtain reproducible results, cables and auxiliary wires must be arranged vertically downward (through a hole in the insulating support).

CC.2.6 Sound Level Arrangement

When performing sound measurements with the maximum available sensitivity (radiation) of the receiver, the sound output must be controlled by connecting the sound signal from the speaker to the microphone. In radiation testing, all conductive materials must be placed on a ground plane and the sound signal must be transmitted from the transmitter to the test microphone through a non-conductive sound tube.ANNEX I.A[31] The sound tube must have an appropriate length. The sound tube must have an inner diameter of 6 mm and a thickness of 1.5 mm. A plastic funnel with a diameter corresponding to the speaker of the transmitter must be attached right in front of the speaker of the transmitter. The plastic funnel must ensure flexibility at the attachment point with the transmitter to avoid mechanical resonance. The small end of the funnel must be connected to one end of the sound tube and the microphone to the other end.

(Ro / R) is a value dependent on the electric field strength E at distance R, where Eo is the reference field strength at the reference distance Ro.

C.3 Additional Indoor Measurement Positions Using Non-Reflective Rooms

For radiation measurements, when the frequency of the test signal exceeds 30 MHz, the measurement can be performed at a"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." measurement position indoors using a well-shielded non-reflective room simulating free space. If this type of measurement room is used, it must be clearly stated in the test report.

Test antennas, receivers, substitute antennas, and calibrated signal generators are used similarly as in the conventional methods described in Section C.1. For the frequency band from 30 MHz to 100 MHz, additional calibration adjustments are needed.

An example of such a measurement position could be a shielded non-reflective room measuring 10m x 5m x 5m.

The walls and ceiling need to be covered with high-frequency absorber layers 1 m thick.Deputy ministers of ministerial-level agencies, and Law No. 47/2024/QH15 lThe floor of the measurement position needs to be covered with a 1 m thick metal absorber layer and the wooden floor must be able to bear the weight of the measurement equipment and operator.

For measurements up to 127.75 GHz, a measurement distance along the vertical axis between the measurement room can be from 3 m to 5 m.

The structure of this type of measurement room is described as follows. CC.3.1 Example of the Structure of a Non-Reflective Room

CFree-space field measurements can be simulated in a shielded room where the walls are covered with high-frequency absorber layers. Figure C.3 shows the shielding attenuation and return loss requirements for the walls in this type of measurement room. Because the size and characteristics of typical absorber materials are critical conditions below 100 MHz (absorber layer height <1 m, reflection reduction <20 dB), such a room is usually more suitable for measurements above 100 MHz. Figure C.4 shows the structure of a

shielded non-reflective room with a floor area of 5 m x 10 m and a height of 5 m. The ceiling and walls are covered with conical high-frequency absorber layers about 1 m high. The floor is covered with an absorber layer.

The internal dimensions of the room are 3 m

8m x 3 m, allowing the maximum measurement distance in the room to be 5 m along the center axis. x At 100 MHz, the measurement distance can increase to a maximum of 2

The floor absorber layer reduces floor reflections, thus there is no need to change the antenna height and floor reflection impact requirements do not need to be considered. l.

Therefore, the measurement results can be verified by simple calculations while the instability of the measurement is reduced to the smallest possible value due to the simple measurement configuration.

C.3.2 Effects of Parasitic Reflections in Non-Reflective Rooms calculation For free-space propagation under correlated field conditions E = Eo

C(Ro / R) is a value dependent on the field strength E at distance R, where Eo is the reference field strength at the reference distance Ro.ưởIt is very useful to use this correlation for comparative measurements, as all constants are eliminated with ratios and cable attenuation is not significant compared to the importance of the antenna or antenna size. Deviations from the ideal curve can be easily seen if the logarithm of the above equation is used, as the

theoretical correlation x It is very useful to use this correlation for comparative measurements, as all constants are eliminated with ratios and non-degraded cables are not significant to the antenna or antenna size. Deviations from the ideal curve can be easily seen if logarithms of the above equation are used, because the theoretical correlation

It is very useful to utilize this correlation for comparative measurements, as all constants are eliminated with ratios and cable attenuation does not affect the importance of the antenna or antenna size. Deviations from the ideal curve can be easily seen if the logarithm of the above equation is used, asì the theoretical correlationưởThe relationship between field strength and distance can be displayed as a straight line and deviations occur in a clear reality that we can observe. This indirect method shows disturbances caused by reflection more easily and closer than direct measurements of fading.

With a non-reflective measurement chamber of the size proposed in Part A.3 at frequencies below 100 MHz, where there are no far-field conditions, and measuring stronger reflections, careful calibration is also required.

In the medium frequency range from 100 MHz to 1 GHz, the dependence of field strength on distance follows ato very strong relationship.

In the frequency range from 1 GHz to 12.75 GHz, due to increased reflection, the dependence of field strength on distance will not be closely correlated.

C.3.3. Calibration of Non-Reflective Measurement Chambers

Calibration of non-reflective measurement chambers must be performed within the frequency range of 30 MHz to 12.75 GHz.

Figure C.3 - Technical requirements for shielding and reflection

Figure C.4 - Example structure of a non-reflective measurement chamber

 

QCVN 110:2017/BTTTT was compiled by the Post and Telecommunications Science and Technology Institute, reviewed by the Department of Science and Technology, and promulgated along with Circular No. 24/2017/TT-BTTTT dated October 17, 2017.

[1] ETSI EN 301 033 V1.4.1 (2013-09): Electromagnetic Compatibility and Radio Spectrum Matters (ERM); Technical Characteristics and Methods of Measurement for Shipborne Watchkeeping Receivers for Reception of Digital Selective Calling (DSC) in the Maritime MF, MF/HF and VHF Bands.