900 MHz RECEIVER
5-9
July 2000
Part No. 001-2000-720
5. The voltage on U209, pin 6 (TP2) should be
> 2V DC.
6. Record the voltage on J201, pin 13 (TP5) ____.
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 Synthesizer is reprogrammed for the Receive
Channel.
5.3.6 FRONT END ADJUSTMENTS
1. Set the signal generator to the Receive Channel at a
level sufficient to produce an output voltage on
J201, pin 7 (TP3) (RSSI Output).
2. Tune L204, L205, L206, L201, L202, L203 and
L204 for a peak voltage on J201, pin 7 (TP3).
Decrease the generator output level to maintain a
2-3V reading at J201, pin 7.
3. Set the generator to 1000
µ
V with a 1 kHz tone at
±
1.5 kHz deviation (100
µ
V at the Rx antenna with
20 dB pad on the generator).
4. Tune the Quadrature detector coil Z213 for maxi-
mum AC voltage on J201, pin 9 (TP4).
5. Adjust R264 for 387 mV RMS,
±
5 mV RMS, on
J201, pin 9.
6. Adjust R284 for 2V DC
±
0.05V DC on J201, pin 9
(TP4).
7. Measure the distortion on pin J201, pin 9 (TP4)
(analog tuning meter is preferred).
8. Tune C207, L209, L211 and L225 for peak voltage
on J201, pin 7 (TP3). Decrease the generator output
level to maintain 2-3V.
Distortion should be <5% (typically < 3%).
9. Repeat Steps 4, 5 and 6.
5.3.7 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).
9. The software programs the synthesizer for
3 MHz below the Receive Channel.
10.Receive sensitivity should be less than 0.35
µ
V
(typically less than 0.30
µ
V).
11. The software programs the synthesizer for the
Receive Channel.
Содержание CONVENTIONAL VOTING RECEIVER
Страница 2: ... 2 February 1996 Part No 001 3039 505 ...
Страница 4: ... 4 February 1996 Part No 001 3039 505 ...
Страница 16: ...INTRODUCTION 1 6 July 2000 Part No 001 2000 720 ...
Страница 42: ...2 26 July 2000 Part No 001 2000 720 ...
Страница 64: ...UHF RECEIVER 3 22 July 2000 Part No 001 2000 720 ...
Страница 68: ...3 36 July 2000 Part No 001 2000 720 ...
Страница 86: ...800 MHz RECEIVER 4 18 July 2000 Part No 001 2000 720 ...
Страница 90: ...4 22 July 2000 Part No 001 2000 720 ...
Страница 112: ...5 22 July 2000 Part No 001 2000 720 ...
Страница 118: ...INTERFACE BOARD 6 6 July 2000 Part No 001 2000 720 ...
Страница 121: ...INTERFACE BOARD 6 9 July 2000 Part No 001 2000 720 ...
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 ...
Страница 124: ...INTERFACE BOARD 6 12 July 2000 Part No 001 2000 720 ...
Страница 128: ...6 12 July 2000 Part No 001 2000 720 ...
Страница 130: ...6 2 July 2000 Part No 001 2000 720 ...
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 ...