VHF RECEIVER
2-12
July 2000
Part No. 001-2000-720
7. Set the generator to 100
µ
V into the receiver with a
1 kHz tone at
±
3 kHz deviation.
(1000
µ
V at the generator with 20 dB pad gives
100
µ
V at the receive antenna.)
8. Tune Z205 for 2V
±
0.05V at U201, pin 9.
9. Tune RV203 for 387 mV RMS,
±
5 mV RMS, at
TP202.
10.Adjust RV202 for 2V ±0.05V at TP202.
11. Connect a distortion analyzer to TP202.
12.Tune L201, L203, L204 and L206 for minimum
distortion <5%, (typically <3%).
13.Repeat Step 12 then Steps 8, 9 and 10.
2.3.7 AUDIO DISTORTION
1. On the Interface Board, plug a 16 ohm load at J104.
2. Connect a distortion analyzer to the 16 ohm load.
3. On the Interface Board, measure the distortion of
the receive audio at J104 with the local volume con-
trol set to 2.8V RMS.
4. The reading shall be less than 3%.
(Typically less than 1%.)
5. On the Interface Board, measure receive sensitivity
at J104.
6. The reading should be less than 0.35
µ
V.
(Typically 0.25
µ
V.)
7. The software programs the synthesizer for
1 MHz above the Receive frequency.
8. Receive sensitivity should be less than 0.35
µ
V.
(Typically less than 0.30
µ
V.)
9. The software programs the synthesizer for
1 MHz below the Receive frequency.
10.Receive sensitivity should be less than 0.35
µ
V.
(Typically less than 0.30
µ
V.)
11. Adjust the signal generator level to produce 15 dB
SINAD.
12.Adjust RV201 for 0.5V ±0.02V at TP201.
2.4 FULL CVR TEST
1. Select TEST - FULL RPTR/STATION/CVR and
press Enter.
NOTE: All audio generators and audio voltmeters are
unbalanced unless specifically stated otherwise.
2.4.1 VOLTAGE MEASUREMENTS
1. Disconnect the receiver-to-interface cable
(20-pin) from J201 of the Interface board.
2. Apply power to the Interface board.
3. Measure the voltages at the following pins.
U221, pin 1
+12V DC
±
0.4V
U223, pin 2
+9V DC
±
0.4V
U224, pin 2
+5V DC
±
0.2V
U204, pin 7
+1.25V DC
±
0.06V
Junction of L202/C279 -5V DC
±
0.4V
4. Apply power to the Receiver by plugging the 20-pin
cable from the Interface Board into J201 (see
Figure 2-29
).
2.4.2 RECEIVER FREQUENCY CHECK
1. Check the receiver injection frequency with a
"sniffer" pickup loop, or RF probe and a suitable
frequency counter placed near TP102.
2. TCXO Adjustment
Set Y401 (TCXO) for the Injection Frequency
±50 Hz (Inj Freq = chnl freq + 52.95 MHz).
Receiver Audio Distortion Measurement
1. Adjust the RF generator for 100
µ
V into the receiver
with a 1 kHz tone at
±
3 kHz deviation.
2. Adjust R207 for 0 dBm (775 mV RMS) at J210.
Содержание CONVENTIONAL VOTING RECEIVER
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Страница 16: ...INTRODUCTION 1 6 July 2000 Part No 001 2000 720 ...
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Страница 64: ...UHF RECEIVER 3 22 July 2000 Part No 001 2000 720 ...
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Страница 118: ...INTERFACE BOARD 6 6 July 2000 Part No 001 2000 720 ...
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Страница 122: ...INTERFACE BOARD 6 10 July 2000 Part No 001 2000 720 Figure 6 3 RDM INTERFACE BOARD SCHEMATIC 1 OF 2 ...
Страница 123: ...INTERFACE BOARD 6 11 July 2000 Part No 001 2000 720 Figure 6 4 RDM INTERFACE BOARD SCHEMATIC 2 OF 2 ...
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Страница 134: ...POWER SUPPLIES 8 4 July 2000 Part No 001 2000 720 ...
Страница 146: ...800 MHz RECEIVER CHANNEL FREQUENCY CHART A 12 July 2000 Part No 001 2000 720 ...