DANPHONE Futronic GMDSS-AIS-SART, Руководство пользователя, Страница: 29 / 42

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EPIRB Test
When performing EPIRB tests, always use the test mode on the EPIRB. Doing so, the EPRIB
will radiate a single burst that is specially coded to be ignored by the COSPAS-SARSAT
system.
If the EPIRB is accidentally activated in the emergency transmission mode, the test box will
display WARNING ALARM. Then, the EPIRB should be turned off at once and the false alert
reported to the nearest coast guard station or Search and Rescue centre
.
The test box is very sensitive to receiving EPIRB signals, so in most cases you should not use
an antenna when testing EPIRBs. If the display shows “Please wait”, the test box has detected
the transmission but is still waiting for the rest to follow. If nothing happens, it is usually because
the signal is too strong or too week. Then, move the EPRIB closer or further away.
EPIRBs are available for transmitting at various frequencies. So, in the EPIRB test mode the
first step is to select frequency mode. Starting with 406.025 MHz, press OK to prepare for tests
at this frequency, or press UP in order to move to 406.028 MHz and further on to 406.037 and
406.040 MHz. Pressing DOWN takes you to 121.5 MHz.
If the EPIRB does not provide any information of the frequency, you are advised to begin with a
frequency measurement = FRQ (can be done at any of the frequency modes available) and
then select the correct frequency mode for the full EPIRB test.
In the 406 MHz frequency modes there are the following sub modes: FRQ, MEAS and DATA.
In sub mode FRQ, only frequency and signal level are measured.
In sub mode MEAS the test box performs a full test, measuring frequency and signal level
during the test transmission and recording the data strings contained in the transmission. All
data are automatically stored in the memory. Pressing the DOWN button repeatedly, the data
can also be viewed in the display, line by line.
In sub mode DATA you can choose whether the last received EPIRB data are to be displayed
as HEX data or as ordinary text. Then, press DOWN to view the data line by line.
In the 121.5 MHz mode there is a choice between ORD (Ordinary) and IMG (Image). First,
select ORD and FRQ to measure the frequency. Then select IMG and FRQ to measure the
frequency again. Same result from both tests proves that the measured frequency is correct and
not just an image frequency.
Please note that it may not be possible to make frequency measurements of all 121.5 MHz
EPIRBs, as the AM modulation in some cases will prevent this. If so, select AF instead of FRQ.
In the AF mode the internal loudspeaker is switched on and the AM modulated signal can be
heard during transmission. This proves that the EPIRB is transmitting on the correct frequency.
Pressing any of the buttons terminates the AF mode.
EPIRB
1 - 5 meter