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ALIGNMENT AND TEST PROCEDURES
Data Level Adjustment
1. Remove VNC cards if present.
Set modulation analyzer LPF to 3 kHz.
Press the space bar to key the transmitter.
2. Adjust U151 with the PgUp/PgDn and CurUp/Cur/
Dn keys to achieve ±1 kHz (±100 Hz) transmit devi-
ation, 25 kHz channels (±800 Hz 12.5 kHz
channels).
3. Press the space bar to unkey the transmitter.
Audio/Data Deviation Check
1. On the MAC, apply a 1 kHz tone at +7 dBm
(1.73V RMS) to P100, pin 32.
Set modulation analyzer LPF to 3 kHz.
2. Press the space bar to key the transmitter.
3. Measured deviation should be ±4.5 kHz (±200 Hz),
25 kHz channels (±2.4 kHz (±100 Hz) 12.5 kHz
channels).
4. Press the space bar to unkey the transmitter.
Disconnect all cables.
CWID Level Check
1. Set modulation analyzer LPF switch to 3 kHz.
Press the space bar to key the transmitter.
2. Deviation should be 1.5 kHz to 2.5 kHz, 25 kHz
channels, (±0.750 kHz to 1.75 kHz, 12.5 kHz
channels).
3. Press the space bar to unkey the transmitter.
Local Speaker/Microphone Check
1. On the MAC, plug a Speaker/Microphone into
J101/J102. Set modulation analyzer LPF switch to
3 kHz.
2. Press the space bar to key the transmitter.
3. Press the microphone PTT and say "four" loudly
into the microphone.
August 2000
Part No. 001-2001-200
4. Deviation should measure ±3 to ±3.5 kHz, 25 kHz
channels, (±0.75 kHz to 1.6 kHz, 12.5 kHz
channels).
5. Release the microphone PTT.
6. Press the space bar to unkey the transmitter.
Transmitter Hum and Noise Ratio (Optional)
NOTE: An HP8901A modulation analyzer is required
for this test.
1. On the modulation analyzer press:
300 Hz HPF
3000 Hz LPF
FM
Pre-Display
750 µS
Avg RMS Cal
.44 (25 kHz channels)
.22 (12.5 kHz channels)
dB
2. Press the space bar to key the transmitter and mea-
sure the Hum and Noise Ratio. The reading should
be less than -50 dB (12.5 kHz) or -55 dB (25 kHz).
3. Press the space bar to unkey the transmitter.
Transmit Audio Distortion
1. On the modulation analyzer press:
FM
50 Hz
15 kHz
2. On the MAC, apply -11.7 dBm at 1 kHz to
P100, pin 32.
3. Press the space bar to key the transmitter.
4. Adjust audio level to produce ±1 kHz deviation
(25 kHz) or ±0.5 kHz (12.5 kHz deviation).
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