Marine Radio Test Set MRTS-7M (GMDSS Tester) is designed to perform the annual surveys of MF/HF/VHF Radios with DSC and NAVTEX receivers in accordance with IMO A.948 (23) or A.997(25), A.1020(26) resolutions.

MRTS-7M provides:

  • operation tests by means of transmission of FM modulated signal and reception of the signal from station sent by operator on any simplex VHF channel including 6, 13 and 16.
  • operation tests on all MF/HF frequency range (1600 – 30000) kHz. The frequency can be set with adjustable step. 
  • check VHF DSC signal by means of transmission or reception either GMDSS distress call to all ships or a selective test call addressed to particular MMSI code on channel 70.
  • check MF/HF DSC signal by means of transmission or reception either GMDSS distress call to all ships or a selective test call addressed to particular MMSI code on any of 6 distress channels.
  • measurement the frequency including carrier, space and mark frequencies as well as frequency deviation of received signal.
  • measurement the transmitted and reflected power on any VHF channel and capable to test the sensitivity of the receiver. MRTS-7M measures transmitted of any MF/HF channel.
  • check the NAVTEX equipment by means of sending one of two available test messages on any of three frequencies: 490 kHz, 518 kHz or 4209.5 kHz.

Supported equipment:

  • VHF receiver-transmitters
  • VHF DSC Controllers
  • VHF Watch Receivers
  • MF/HF radiotelephone equipment
  • MF/HF DSC Controllers
  • MF/HF Watch Receivers
  • NAVTEX equipment

Complete set of the tester:

  1. MF/HF/VHF Marine Radio Test System (MRTS – 7M)
  2. Power supply unit
  3. VHF-telescopic antenna
  4. MF/HF-wire antenna
  5. VHF Pow-VSWR meter (50W)
  6. MF/HF Attenuator 250W
  7. USB-A – USB-B cable
  8. NMEA IN/OUT cable (DB9 fem – open wire 1.5m)
  9. User Manual
  10. Calibration Certificate
  11. Package

Operational frequencies:

VHF range all simplex channels:  156,000-163,000 MHz 

VHF range CH70:   156,525 MHz

MF/HF Range: 400 - 30 000 kHz

MF range DSC Mode:

  • 2187.5 kHz – Distress frequency;
  • 2177.0 kHz – Traffic frequency;
  • 2189.5 kHz – Traffic frequency.

HF range DSC Mode:

  • 4207.5 kHz
  • 6312.0 kHz
  • 8414.5 kHz
  • 12577.0 kHz
  • 16804.5 kHz

Measurement accuracy:

  • Frequency measurement general: +/- 0.2 ppm +/-1 digit
  • Frequency measurement at CH70: +/- 0.2kHz

Ouput signal:

Stability of output frequencies (GTXO-91V/EN 19.20MHz):

  • Frequency setup accuracy at +25°С: ±1,0 ppm ;
  • Temperature stability of frequency in range of  0 … +45°С:  ±0,5 ppm ;
  • Aging rate: not more ±1,0 ppm/year for first year.

Levels of output signals in DSC mode:

Max. POW level:

  • VHF range: -13 dBm ± 1 dB;
  • MF/HF range:  -13 dBm ± 1 dB.

Min. POW level:

  • VHF range: -99 dBm ± 3 dB;
  • MF/HF range:  -99 dBm ± 3 dB

Levels of output signals in MF/HF and VHF Synthesizer mode.

  • 400 - 30 000 kHz: 13 dBm ± 1,0 dB
  • 156 000 - 163 000 kHz: 13 dBm ± 1,0 dB

Signal attenuation range:  0 - 93  dB 

Downloads are not currently avaliable

Other Products



Our company has developed completely new maritime safety equipment AIS-SART Musson - 502A, which operates in A and B VHF AIS channels.

Also we manufacture float Free Satellite Emergency Position Indicating Radio Beacon (EPIRB) under the IMO requirements for COSPAS-SARSAT system, a mandatory item in the GMDSS (Global Maritime Distress Safety System). Certified and type approved.



We offer special equipment that mainly used by laboratories or manufacturers for quality control in production.

High accuracy professional 406MHz BEACON Tester BT-611M indended to check beacon compliance with the requirements, specified in C/S doc. T.001, T.007. AIS-SART Tester Pro Lab Tester is device used for verification of AIS and AIS-SART parameters in real time.

GALILEO REFERENCE BEACON GENERATOR BG-105/102r is high-precision simulator of Cospas-Sarsat emergency beacon messages.