900 MHz RECEIVER
5-10
July 2000
Part No. 001-2000-720
5.4 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.
5.4.1 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.
U109, 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 5-29
).
5.4.2 RECEIVER FREQUENCY CHECK
1. Check the receiver injection frequency with a
"sniffer" pickup loop, or RF probe and a suitable
frequency counter placed near L210.
2. TCXO Adjustment
Set Y201 (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.
3. Connect a 16 ohm load and distortion analyzer to
J204 of the Interface Board.
4. Adjust R262 for 2.8V RMS and measure the distor-
tion. Distortion should be < 3%.
Figure 5-28 RECEIVER ALIGNMENT POINTS
L201
L202
L203
L204
L205
L206
L223
L224
L207
L209 C373
L211
TP5
L225
Z213
C375
R284
U206
R261
TP3 J201
R264
TP4 TP6 U207 Y201 TP1
U208 U210
L220
U209
TP2
J202
A201
Содержание CONVENTIONAL VOTING RECEIVER
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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 ...
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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 ...