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1) Connect the coupler output to a frequency counter, set the radio on CH16 (156.800 MHz),
key to transmit, and read the indication on the frequency counter.
2) Adjust trimmer capacitor CV1 on the RF PCB for the desired frequency (156.800 MHz) on
the frequency counter.
Figure 5-3
5.3.3 Modulation Adjustment (TRANSMITTER)
1) Connect the coupler output to an FM linear detector. Connect an audio oscillator to the
microphone connector and key to transmit.
2) Set the audio oscillator output to-25 dBm, 300Hz and adjust RV101 on the CPU PCB for a
deviation of 4.5 KHz +/-300 Hz. (See Fig. 5-4.)
3) Set the audio oscillator output to-43 dBm, 1 KHz and read the deviation meter (2.5KHz -
3KHz)
Figure 5-4
5.3.4 Power Output Adjustment (TRANSMITTER)
1) Connect an RF power meter to the antenna connector. Key to transmit and adjust RV1 for
the low power on the RF PCB as shown in Table 5-2. (See Fig. 5-5.) The high power will be
adjusted automatically.
Sequence Condition Adj. Point Target power
1 6.0 Vdc H/L LRV1 low power 0.9W +/- 0.05W (limit1.0W)
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