mcmurdo Fastfind, Руководство по обслуживанию

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Commercial in confidence 85-909
PLB service manual Issue 4 Page 11
3.3. Message read
NOTE: When the antenna is not deployed, the transmission power is greatly reduced. The
Message Reader must be very close to the PLB to detect this weak signal.
Use a "Message Reader" to verify the unique ID. A typical instrument is the ARG5410, which
is used here to describe the process. For full details of the operation of the Reader, refer to
its handbook; only an outline is given here. The procedure is as follows:
1. On the Reader select RECV mode
2. Position the Reader approx. 1 m (3 feet) from the PLB if the antenna is deployed,
or as close as possible if the antenna is not deployed
MESSAGE
READER
ANTENNA
3. On the PLB press and hold the OFF/Test button
4. After about 4 seconds the Reader should emit three bursts of sound
This proves the 121.5 MHz homer is radiating and modulating correctly. If the ARG
5410 Reader is not used, then another suitable facility for detecting the 121.5 MHz
swept tone must be provided (an air band receiver for example).
5. The Reader should then beep and report S’TEST OK
6. The Reader will revert to its Menu. Select VIEW mode
7. Use
← →
keys to view the decoded 406 MHz message content
8. Confirm the frequency – Fastfind/Plus is 406.028MHz and Max/G is 406.037MHz.
This proves the 406 MHz transmitter is radiating within the correct frequency band. If
the ARG5410 Reader is not used, then another facility for measuring the 406 MHz
frequency must be provided (a spectrum analyser for example). Note that on some
older readers the frequency will be read as out of range.
9. Confirm the 15 digit ID agrees with PLB rear identity label UIN
(but see note on following page)
This proves the 406 MHz transmitter is modulating correctly and the PLB is
programmed with the correct identity. If the ARG5410 is not used then another facility
for message decoding must be provided (other message readers).
10. Confirm the Country is correct
11. If fitted, check that the GPS is identified and that the LAT and LONG are
displayed (as *****). Note: The ARG5411 will not perform this function.
Q
11:25
Mesg#11 S’TEST OK
ID: 9D0D071D3B00013
406.0257 MHz PASS
Typical screen