Viking 242-2009-632 - Manual (Page 143)

ALIGNMENT AND TEST PROCEDURES
7-15
March 1999
Part No. 001-2009-600
3. Adjust R237 for 0 dBm (775 mV RMS).
4. Connect a 16 ohm load and distortion analyzer to
J101 or J104 of the MAC.
5. Adjust R236 for 2.8V RMS and measure the distor-
tion. Distortion should be < 3%.
Receiver Hum and Noise Measurement
NOTE: Receiver cover must be on for this measure-
ment.
1. Adjust the RF generator for 100
µ
V output with a 1
kHz tone at
±
1.5 kHz deviation.
2. Connect a 16 ohm load and distortion analyzer to
J101 or J104 of the MAC.
3. Adjust R236 for 2.8V RMS.
4. Remove modulation from the RF generator. The
measured level shall be
≤
-45 dB.
Receiver SINAD Measurement
1. Adjust the RF generator for 100
µ
V output with a 1
kHz tone at
±
1.5 kHz deviation.
2. Connect a 16 ohm load and distortion analyzer to
J101 or J104 of the MAC.
3. Adjust R236 for 2.8V RMS.
4. 12 dB SINAD reading shall be
≤
0.35
µ
V.
Receiver Squelch Adjustment
1. Adjust the RF generator for 100
µ
V output with a 1
kHz tone at
±
1.5 kHz deviation.
2. Connect a 16 ohm load and distortion analyzer to
J101 or J104 of the MAC.
3. Adjust R236 for 2.8V RMS.
4. Set the RF generator output for 5 dB SINAD.
5. Adjust R234 on the MAC so the Receiver just
squelches.
6. Increase the RF generator output until the Receiver
unsquelches. Reading shall be
≤
10 dB SINAD.
Receiver Data Level Adjustment
1. Adjust the RF generator for 100
µ
V output with a
100 Hz tone at
±
800 Hz deviation.
2. Insert test cables into J100/J103 on the MAC 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
µ
V output with a 1
kHz tone at
±
1.5 kHz deviation.
2. Plug a Speaker/Microphone into J101/J102 of the
MAC.
3. Adjust R236 until the 1 kHz tone is heard.
Receiver Desense Check
1. Adjust the RF generator for 100
µ
V output with a 1
kHz tone at
±
1.5 kHz deviation.
2. Connect a 16 ohm load and distortion analyzer to
J101 or J104 of the MAC.
3. Adjust R236 for 2.8V RMS.
4. Adjust the RF generator output for 12 dB SINAD.
5. Use the "Turn on carrier" button to key the transmit-
ter.
6. SINAD shall not degrade more than 1 dB;
i.e. no less than 11 dB SINAD.
7. Use the "Turn on carrier" button to unkey the trans-
mitter.
Receiver Miscellaneous Tests (Optional)
Several additional tests may be performed on the
Repeater Receiver as listed below:
1. Signal Displacement Bandwidth