DANPHONE Futronic GMDSS-AIS-SART, User Manual, Page: 21 / 42

21
Sensitivity Test
In the sensitivity test mode, the test box outputs a modulated signal on VHF channels 6, 13, 16
and 67 respectively. With an external attenuator this test can be used to check the sensitivity
of a ship's VHF radio. The modulated signal can be heard and checked in the radio’s speaker.
With sensitivity tests, use this setup:
Select SENSITIVITY TEST and press OK. CH06 will appear as the default channel in the
display. Other channels can be selected by pressing the UP or DOWN button. At the desired
frequency, press SEND and the test box will keep sending the modulated signal. To stop the
transmission, press END.
In the sensitivity test mode, it is very important to use coax cables for the connection of the
equipment.
For reference, the test box RF output level is approx. -36 +/- 2 dBm.
This test mode can also be used to simply check if the modulated signal is well received over
the air:
Send DSC
In preparation of making DSC test calls, the first choice is to decide if a distress call (DISTR) or
a selective test call (TEST) is to be transmitted.
In the DISTR mode, there is a choice between VHF and MF/HF.
At VHF the frequency for CH 70 is shown, and pressing OK initiates a transmission.
At MF/HF, select the desired frequency with the UP/DOWN buttons. Press OK at the desired
frequency, and the call sequence will be transmitted.
In the TEST mode, there is a choice between
VHF on 156.525 MHz, TFC on 2177.0 kHz or
2189.5 kHz, and MF/HF on 2187.5 kHz, 4207.5 kHz, 6312.0 kHz, 8414.5 kHz, 12577.0 kHz or
16804.5 kHz.
At MF/HF and TFC TEST calls, there is a choice between reduced power (-70 dBm) and normal
power (-15 dBm).
ANT.
VHF RECEIVER
ATTENUATOR
ANT.
VHF RECEIVER