User Manual

ALIGNMENT PROCEDURE
6-3
Part No. 001-3422-003
6.5.1 MODULATION ALIGNMENT
1. Apply a 1V p-p, 100 Hz, +2.5V DC bias, square-wave to J201, pin 6.
2. Transmit into the modulation analyzer and observe modulation output on the oscilloscope. Set the modulation
analyzer high pass filtering OFF and no less than a 15 kHz low pass filter.
3. Preset R827 to 1.5 VDC on the wiper.
4. Load the synthesizer with a channel frequency at the MIDDLE of the band.
5. Adjust R825 for a flat square wave.
6. Apply a 100 Hz, +2.5V DC biased, sine-wave to J201, pin 6. The modulation analyzer should still have the 15
kHz lowpass filter selected.
7. Adjust the audio analyzer output level to achieve a transmit deviation of:
1.5 kHz for 15 kHz BW radios
3.0 kHz for 30 kHz BW radios
8. Load the synthesizer with a channel frequency at the LOW end of the band.
9. Input a 100 Hz, +2.5V DC biased, sine-wave and set a 0 dB reference on the Modulation Analyzer.
10.Apply a 1 kHz, +2.5V DC biased, sine-wave. The level should be within ±3.5 dB of the reference at 100 Hz.
11.Load the synthesizer with a channel frequency in the MIDDLE of the band.
12.Input a 100 Hz, +2.5V DC biased, sine-wave and set a 0 dB reference on the Modulation Analyzer.
13.Apply a 1 kHz, +2.5V DC biased, sine-wave. The level should be within ±0.5 dB of the reference at 100 Hz.
14.Load the synthesizer with a channel frequency in the HIGH end of the band.
15.Input a 100 Hz, +2.5V DC biased, sine-wave and set a 0 dB reference on the Modulation Analyzer.
16.Apply a 1 kHz, +2.5V DC biased, sine-wave. The level should be within ±3.5 dB of the reference at 100 Hz.
17.Unkey the transmitter.