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 


GMDSS Tester MRTS-7M Brochure (version: 2.0; 14.02.2020; 7.9 Mb) Main features and specification of GMDSS Tester MRTS-7M
Complete technical description and operation user manual for GMDSS Tester MRTS-7M is available in PDF format. Note: Limited access. Login for downloading the item.
Test report Example (version: 5.0.1; 15.03.2019; 544.4 kb) Examples of certificate created by GMDSS Tester MRTS-7M Software. The test report is an important logical completion of test process.

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