Codan 2110 series - Figure 20: Acceptable Two-Tone RF Envelope; Figure 21: Defective Two-Tone RF Envelope (Typical Overbias of PA)

Repair procedures, tests, and adjustments
Manpack Transceiver 2110 series Repair Guide 73
Performing the Distortion test using an oscilloscope
To test distortion and spurious signals using an oscilloscope:
1 Set up the equipment (see page 56, Setting up the test equipment).
1 Select a channel to test.
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 Analyse the RF envelope using Figure 20, Figure 21, Figure 22, and Figure 23.
Figure 20: Acceptable two-tone RF envelope
Figure 21: Defective two-tone RF envelope (typical overbias of PA)
Pass The RF waveform envelope is acceptable.
NOTE
If the waveform is acceptable, there is no need to perform the
Intermodulation test.