800 MHz RECEIVER
4-9
July 2000
Part No. 001-2000-720
4.3.4 VCO TEST
1. The software programs the synthesizer for
3 MHz above the Receive Channel.
2. The voltage on TP2 should be < 7.5V.
3. Record the voltage on J201, pin 13 __________.
4. The software programs the synthesizer for
3 MHz below the Receive Channel.
5. The voltage on TP2 should be > 2V.
6. Record the voltage on J201, pin 13 __________.
7. If the voltages recorded in Steps 3 and 6 are not
within
±
0.2V, tune L224 as required to balance the
voltage readings.
8. The software programs the synthesizer for the
Receive Channel.
4.3.5 FRONT END ADJUSTMENTS (REV. 5)
REVISION 5 OR EARLIER BOARDS
1. Set the signal generator to the Receive Channel at a
level sufficient to produce an output voltage on
J201, pin 7 (RSSI Output).
2. Tune L204, L205, L206, L201, L202, L203 and
L204 for a peak voltage on J201, pin 7. Decrease the
generator output level to maintain a 2-3V reading at
J201, pin 7.
3. Set the generator for 1000
µ
V into the receiver with
a 1 kHz tone at
±
3 kHz deviation (100
µ
V at the
receive antenna with 20 dB pad at the generator).
4. Tune Z213 for 2V
±
0.05V on J201, pin 9.
5. Tune R264 for 387 mV RMS,
±
5 mV RMS, on TP4.
6. Repeat Steps 4 and 5.
7. Measure the distortion on TP4.
8. Tune L207, L209, L211 and L225 for minimum dis-
tortion <5%, (typically <3%).
9. Repeat Step 8 then Steps 4, 5 and 6.
4.3.6 FRONT END ADJUSTMENTS (REV. 6)
REVISION 6 BOARDS
1. Set the signal generator to the Receive Channel at a
level sufficient to produce an output voltage on
J201, pin 7 (RSSI Output).
2. Tune L204, L205, L206, L201, L202, L203 and
L204 for a peak voltage on J201, pin 7. Decrease the
generator output level to maintain a 2-3V reading at
J201, pin 7.
3. Set the generator for 1000
µ
V into the receiver with
a 1 kHz tone at
±
3 kHz deviation (100
µ
V at the
receive antenna with 20 dB pad at the generator).
4. Adjust the Quad Detector Coil Z213 for 2V DC on
U202, pin 9.
5. Adjust R264 for 387 mV RMS on J201, pin 9 (TP4).
6. Adjust R282 for 2V DC ±0.05V on J201, pin 9
(TP4).
7. Measure the distortion on TP4.
8. Tune L207, L209, L211, L225, C373 and C375 for
minimum distortion <5%, (typically <3%).
9. Repeat Step 8 then Steps 4, 5 and 6.
4.3.7 AUDIO DISTORTION
1. Plug a 16 ohm load at J204 on the RDM.
2. Connect a distortion analyzer to the 16 ohm load.
3. Measure the distortion of the receive audio at J204
on the RDM with the local volume control set to
2.8V RMS.
4. The reading should be < 3% (typically <1%).
5. Measure receive sensitivity at J204 on the RDM.
6. The reading should be < 0.35
µ
V (typ. 0.25
µ
V).
7. The software programs the synthesizer for
3 MHz above the Receive Channel.
8. Receive sensitivity should be less than 0.35
µ
V
(typically less than 0.30
µ
V).
Summary of Contents for CONVENTIONAL VOTING RECEIVER
Page 2: ... 2 February 1996 Part No 001 3039 505 ...
Page 4: ... 4 February 1996 Part No 001 3039 505 ...
Page 16: ...INTRODUCTION 1 6 July 2000 Part No 001 2000 720 ...
Page 42: ...2 26 July 2000 Part No 001 2000 720 ...
Page 64: ...UHF RECEIVER 3 22 July 2000 Part No 001 2000 720 ...
Page 68: ...3 36 July 2000 Part No 001 2000 720 ...
Page 86: ...800 MHz RECEIVER 4 18 July 2000 Part No 001 2000 720 ...
Page 90: ...4 22 July 2000 Part No 001 2000 720 ...
Page 112: ...5 22 July 2000 Part No 001 2000 720 ...
Page 118: ...INTERFACE BOARD 6 6 July 2000 Part No 001 2000 720 ...
Page 121: ...INTERFACE BOARD 6 9 July 2000 Part No 001 2000 720 ...
Page 124: ...INTERFACE BOARD 6 12 July 2000 Part No 001 2000 720 ...
Page 128: ...6 12 July 2000 Part No 001 2000 720 ...
Page 130: ...6 2 July 2000 Part No 001 2000 720 ...
Page 134: ...POWER SUPPLIES 8 4 July 2000 Part No 001 2000 720 ...
Page 146: ...800 MHz RECEIVER CHANNEL FREQUENCY CHART A 12 July 2000 Part No 001 2000 720 ...