Ian Waugh - A Mariner\'s Guide to Marine Communications

(John Hannent) #1

Reports can be sent to a normal address from your address book,
or they can be sent to a particular Data Network Identity (DNID), which
will identify a mailbox ashore to which the information is to be delivered.
More than one DNID can be programmed.


Tests and Checks for your Inmarsat-C Installation


If your equipment is receiving messages, including EGC messages



  • and your transmitted messages are being delivered, there should be
    no need to test the equipment during normal operation. There will be
    an indication of signal strength on the computer screen (VDU) and there
    will be a transceiver status area in the software that will tell you how
    good the received Signal is. If you are in clear sight of the satellite and
    your antenna has not been compromised in any way, the signal strength
    should remain good.


A build-up of carbon deposits from the funnel may reduce the
performance of the antenna. Similarly, the protective dome on the
antenna should not be painted using metallic/lead-based paints. When
first installed the receiver will perform a link test to check the operation
of the equipment. There will be a window on your software that will
show the result of the link test. A link test can be carried out at any time
if you need to confirm the performance of the equipment. You should
consult your user manual to confirm how to do the link test - which
includes a test distress alert - before initiating the test on the software.


The power and data connections to each piece of equipment should
be secure. Before removing power/data cables from any piece of
equipment, for checking/testing, make a note of where the particular
cable was connected (both ends!).


Some Land Earth Stations offer a test facility, which you can access
using speCial access code 91. Enter 'Test' in your address book and choose
'Special' '91' Messages sent to this address, if supported by the LES, will
generate a reply to let you know that everything is well.


Alternatively, you can send a message to yourself. Enter 'My Mobile'
in the address book; choose 'mobile', and number 581423456789 (where
581 is the Ocean Region - you may have to choose 582, 583 or 584 if not
in AORE) and 423456789 is you Inmarsat-C mobile ID. Send a brief
message to yourself - it should arrive back as mail in about five minutes.


Antenna radiation hazard (Inmarsat-C)


All transmitting antennas, no matter how small, will generate
hazardous radiation. The extent of the hazard is a factor of:


MARINE COMMUNICATIONS 163
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