Repair procedures, tests, and adjustments
70 Manpack Transceiver 2110 series Repair Guide
1 Record your results and actions (see page 109, Test sheet for the 2110 series
Manpack Transceiver).
1 Return to the Repair flowchart (see Figure 29 on page 95).
Performing the ALC test
To test the ALC of the transceiver:
1 Set up the equipment (see page 56, Setting up the test equipment).
1 Select a channel to test.
1 Set the fine output level adjustment on the 0208 to minimum.
1 Switch on PTT on the 0208.
1 Monitor the output power of the RF envelope on the oscilloscope.
1 Slowly increase the audio output level on the 0208 until the RF output power of the
transceiver stops increasing.
This is the ALC threshold.
1 Record the PEP and the output level (see page 109, Test sheet for the 2110 series
Manpack Transceiver), then increase the audio output level on the 0208 by 10 dB.
1 Record your results and actions (see page 109, Test sheet for the 2110 series
Manpack Transceiver).
To protect the ALC:
1 Reduce the output level on the 0208 until the RF output power of the transceiver is
3 dB below the ALC threshold.
1 Switch off PTT on the 0208.
1 Record the DC supply current from the power supply.
1 Disconnect the coaxial cable from the 50 connector ( ).
1 Switch on PTT on the 0208.
1 Record your results and actions (see page 109, Test sheet for the 2110 series
Manpack Transceiver).
1 Switch off PTT on the 0208.
Pass A display on the power meter that shows an increase in RF output
power that is < 0.5 dB (approximately 10 W).
NOTE
Equivalent readings for power meters without PEP and dB scales are
listed in Table 16 on page 71.
Pass A reading on the power supply that shows a reduction in the DC
supply current of approximately 50% from the reading taken with
the load connected.
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