Codan 2110 series, Repair Manual

Page: 99 / 164

Repair procedures, tests, and adjustments
Manpack Transceiver 2110 series Repair Guide 67
1
Set the RF signal generator to 4.0 kHz above the SCF of the selected USB channel
or 4.0 kHz below the SCF of the selected LSB channel.
1
Record your results and actions (see page 109, Test sheet for the 2110 series
Manpack Transceiver ).
1
Switch off the RF output from the RF signal generator.
1
Return to the Repair flowchart (see Figure 29 on page 95 ).
Performing the Noise Limiter test
To test the noise limiter circuit in the transceiver:
1
Set up the equipment (see page 56, Setting up the test equipment ).
1
Select a channel to test.
1
Set the RF signal generator to 1.0 kHz above the SCF of the selected USB channel
or 1.0 kHz below the SCF of the selected LSB channel.
1
Set the RF output level of the RF signal generator to –115 dBm.
1
Switch on the RF output from the RF signal generator.
1
Adjust the volume via the front panel so the tone is clearly audible.
1
Switch on the noise on the 0208.
1
Record your results and actions (see page 109, Test sheet for the 2110 series
Manpack Transceiver ).
1
Switch off the RF output from the RF signal generator.
1
Switch off the noise on the 0208.
1
Return to the Repair flowchart (see Figure 29 on page 95 ).
Pass A reading on the AC voltmeter that is < 0 dB.
Pass Faint 1 kHz tone with buzzing is audible from the 0208 speaker.