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ALIGNMENT AND TEST PROCEDURES
Receiver Audio Distortion Measurement
1. Adjust the RF generator for 100 µV into the
Receiver with a modulation tone of 1 kHz at
±3 kHz deviation (25 kHz channels)
(±1.5 kHz deviation 12.5 kHz channels).
2. On the MAC, insert test cables into J100/J103 and
connect to an AC voltmeter.
3. Adjust R237 for 0 dBm (775 mV RMS).
4. On the MAC, connect a 16 ohm load and distortion
analyzer to J101 or J104.
5. Adjust R236 for 2.8V RMS and measure the distor-
tion. Distortion should be < 3%.
Receiver Hum and Noise Measurement
1. Adjust the RF generator for 100 µV into the
Receiver with a modulation tone of 1 kHz at
±3 kHz deviation, 25 kHz channels
(±1.5 kHz deviation 12.5 kHz channels).
2. On the MAC, connect a 16 ohm load and distortion
analyzer to J101 or J104.
3. Adjust R236 for 2.8V RMS.
4. Remove modulation from the RF generator. The
measured level must be ≤ -50 dB.
Receiver SINAD Measurement
1. Adjust the RF generator for 100 µV into the
receiver with a 1 kHz tone at ±3 kHz deviation
25 kHz channels (±1.5 kHz 12.5 kHz channels).
2. On the MAC, connect a 16 ohm load and distortion
analyzer to J101 or J104.
3. Adjust R236 for 2.8V RMS.
4. Re-adjust RF level for 12 dB SINAD.
12 dB SINAD reading should be ≤ 0.35 µV.
August 2000
Part No. 001-2001-200
Receiver Squelch Adjustment
1. Adjust the RF generator for 100 µV into the
receiver with a 1 kHz tone at ±3 kHz, 25 kHz chan-
nels (±1.5 kHz deviation 12.5 kHz channels).
2. On the MAC, connect a 16 ohm load and distortion
analyzer to J101 or J104.
3. Adjust R236 for 2.8V RMS.
4. Set the RF generator output for 5 dB SINAD.
5. On the MAC, adjust R234 so the Receiver just
squelches.
6. Increase the RF generator output until the Receiver
unsquelches. Reading should be ≤ 10 dB SINAD.
Receiver Data Level Adjustment
1. Adjust the RF generator for 100 µV into the
receiver with a 100 Hz tone at ±1 kHz, 25 kHz chan-
nels (±800 Hz deviation (12.5 kHz channels).
2. On the MAC, insert test cables into J100/J103 and
connect to an AC voltmeter.
3. Adjust R235 to achieve 340 mV RMS.
Local Speaker/Microphone Check
1. Adjust the RF generator for 100 µV into the
receiver with a 1 kHz tone at ±3 kHz deviation,
25 kHz channels (±1.5 kHz (12.5 kHz channels).
2. On the MAC, plug a Speaker/Microphone into
J101/J102.
3. Adjust R236 until the 1 kHz tone is heard.
Receiver Desense Check
1. Adjust the RF generator for 100 µV into the
receiver with a 1 kHz tone at ±3 kHz deviation,
25 kHz channels (±1.5 kHz 12.5 kHz channels).
2. On the MAC, connect a 16 ohm load and distortion
analyzer to J101 or J104.
7-12
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