Codan 2110 series, Руководство по ремонту, Страница: 108 / 164

Repair procedures, tests, and adjustments
76 Manpack Transceiver 2110 series Repair Guide
1
For each band, adjust the output level of the 0208 until the RF output power of the
transceiver stops increasing, then increase the output level of the 0208 by 10 dB.
1
Analyse the display on the spectrum analyser using Figure 24 .
1
Record your results and actions (see page 109, Test sheet for the 2110 series
Manpack Transceiver ).
1
Switch off PTT on the 0208.
1
Return to the Repair flowchart (see Figure 29 on page 95 ).
To check spurious transmissions and harmonics using a spectrum analyser:
1
Set up the equipment (see page 56, Setting up the test equipment ).
1
Select a channel to test.
1
Set up the spectrum analyser as follows:
1
Switch on PTT on the 0208.
1
Adjust the output level of the 0208 until the RF output power of the transceiver stops
increasing, then increase the output level of the 0208 by 10 dB.
1
Observe the output from the spectrum analyser.
1
Record your results and actions (see page 109, Test sheet for the 2110 series
Manpack Transceiver ).
1
Switch off PTT on the 0208.
1
Return to the Repair flowchart (see Figure 29 on page 95 ).
Pass Intermodulation products are 26 dB down for each band.
Start frequency 600 kHz
Stop frequency 200 MHz
Video bandwidth 3 kHz
Trigger Continuous sweep
Vertical scale 10 dB per division
Reference level Adjust once the transceiver is transmitting at full power
Pass Unwanted emissions typically > 60 dB below peak carrier level.
NOTE
If unwanted emissions are < 50 dB below the peak carrier level,
ensure your test set is calibrated before any further analysis of the
transceiver is performed.