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If the transmission signal is not strong enough to enable the test, you may use the RF Amplifier
(optional accessory) as shown here:
With distress calls, it is important to use a coax cable for the connection between the test box
and the DSC receiver. This will prevent other ship stations to be alerted.
Use this setup with distress calls:
To send a DSC call, select Send DSC and press OK. Then, select TFC or MF/HF respectively.
With TFC, select frequency and press OK. Select Normal or Reduced output power. Usually,
normal power is recommended to send the call.
With MF/HF, select frequency and press OK. Select Dis to send a distress call or Sele to send
a selective call. Select Normal or Reduced output power. Usually, normal power is
recommended to send selective calls. Distress calls are always sent at reduced power.
Following the DSC call, the test box will display Received status. Press OK if the call was
successfully received. Press Fail if the call was not well received. The answer will be stored in
the test box memory for your test report.
Please note: Some DSC receivers have a built-in delay of 1-2 minutes before they acknowledge
distress calls.
The TFC selective call transmits the following information:
120,120
21,95,57,62,40
100
99,99,99,99,90
109
126
126 126 126 126 126 126
117
69
The MF/HF selective call transmits the following information:
120,120
21,95,57,62,40
Format specifier - individual call.
Address - 2195576240
Category - routine
Self identification = Testbox "MMSI No".
First telecommand
Second telecommand
Frequency or channel 126 transmitted six times
Ack. RQ End of sequence
Modulus-2 checksum
Format specifier - individual call.
Address - 2195576240
21
DSC RECEIVER
ANT.
DSC RECEIVER
ANT.
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