E F Johnson Company 2422001-1 Benutzerhandbuch
ALIGNMENT AND TEST PROCEDURES
7-14
August 2000
Part No. 001-2001-200
Part No. 001-2001-200
Data Level Adjustment
1. Remove VNC cards if present.
Set modulation analyzer LPF to 3 kHz.
Press the space bar to key the transmitter.
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).
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.
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).
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).
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.
3 kHz.
2. Press the space bar to key the transmitter.
3. Press the microphone PTT and say "four" loudly
into the microphone.
4. Deviation should measure
±
3 to
±
3.5 kHz, 25 kHz
channels, (±0.75 kHz to 1.6 kHz, 12.5 kHz
channels).
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.
for this test.
1. On the modulation analyzer press:
300 Hz HPF
3000 Hz LPF
FM
Pre-Display
750
3000 Hz LPF
FM
Pre-Display
750
µ
S
Avg RMS Cal
.44 (25 kHz channels)
.22 (12.5 kHz channels)
dB
.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).
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
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).