Codan 2110 series, Руководство по ремонту

Страница: 101 / 164

Repair procedures, tests, and adjustments
Manpack Transceiver 2110 series Repair Guide 69
Performing the Antenna Tuner test (transmit)
To test the antenna tuner in transmit:
1
Set up the equipment (see page 56, Setting up the test equipment ).
1
Connect the artificial antenna to the 2110 (see Figure 18 on page 54 ).
1
Set the Cfg Auto Tune Mode to ATU .
1
Select a channel in Band 1 (see page 60, Examining the profile in the transceiver ).
1
Press
TUNE
, then press PTT to start the tuning process.
1
View the SWR on the tuning screen.
1
Select a channel in the next band, then repeat the test.
1
Record your results and actions (see page 109, Test sheet for the 2110 series
Manpack Transceiver ).
1
Disconnect the artificial antenna and reconnect the dummy load to the 50

connector.
1
Return the Cfg Auto Tune Mode to ATU/50 Ohm/Codan .
1
Return to the Repair flowchart (see Figure 29 on page 95 ).
Performing the Frequency test
To test the frequency of the transceiver:
1
Set up the equipment (see page 56, Setting up the test equipment ).
1
Select a channel with a high frequency (ideally 30 MHz).
1
Press
TUNE
on the front panel.
1
Hold down PTT on the handset, then read the carrier frequency from the frequency
counter.
1
Release PTT on the handset.
NOTE
Use the same channel as used in the receive Antenna Tuner test (see
page 63, Performing the Antenna Tuner test (receive) ).
Pass The SWR starts at a high value and should reduce to < 2.
The power to load must be approximately 25 W PEP.
NOTE
Wait for at least five minutes after switching on the transceiver before
checking the frequency.
Pass A reading on the frequency counter that is within 20 Hz of the
channel frequency.