UHF RECEIVER
3-9
July 2000
Part No. 001-2000-720
2. Tune the VCO capacitor C803 for +7V DC
±
0.05V
at TP401.
Increase the receive frequency by 1 MHz. The volt-
age on TP401 shall be less than 10.5V.
Decrease the receive frequency by 1 MHz. The
voltage on TP401 shall be greater than 3.5V.
3. Alternately tune L140 and L141 in 1/2-turn to
1-turn increments until a voltage is measured at
TP101. At that time, tune L140 for a peak, then
L141 for a peak.
4. Retune L140/L141 for a peak at TP101.
For Receivers operating within 3 MHz of the top of the
receive band (467-470 MHz).
1. Program the Synthesizer for the Highest receive fre-
quency.
2. Set the control line voltage for 12V at TP401.
Check 3 MHz below the programmed frequency
(i.e. 467 MHz) to verify that the control voltage at
TP401 is greater than 2V. The repeater receiver can
now be programmed for the desired operating fre-
quency.
For Receivers operating within 3 MHz of the bottom of
the receive band (430-433 MHz).
1. Program the Synthesizer for the Lowest receive fre-
quency.
2. Set the control line voltage for 2V at TP401.
Check 3 MHz above the programmed frequency
(i.e. 433 MHz) to verify that the control voltage at
TP401 is less than 12V. The repeater receiver can
now be programmed for the desired operating
frequency.
NOTE: The Channel Frequency and Synthesizer
Frequency appear at the bottom of the screen.
3.3.4 RECEIVER FREQUENCY ADJUST
1. Place a pick-up loop (sniffer) or RF probe connected
to a frequency counter near L139.
2. Set Y401 (TCXO) for the Injection Frequency
±
50 Hz (Inj Freq = chnl freq + 52.95 MHz).
3.3.5 VCO TEST
1. The software programs the synthesizer for
1 MHz above the receive channel.
2. The voltage on TP401 should be < 10V.
3. Record the voltage on TP101 __________.
4. The software programs the synthesizer for
1 MHz below the receive channel.
5. The voltage on TP401 should be > 2V.
6. Record the voltage on TP101 __________.
7. If the voltages recorded in Steps 3 and 6 are not
within
±
0.2V, tune L141 as required to balance the
voltage readings.
8. The software programs the synthesizer for the
receive frequency.
3.3.6 FRONT END ADJUSTMENTS
NOTE: Verify that the appropriate IF jumpers (J203,
J204, J205) are selected.
1. Set the signal generator to the receive frequency at a
level sufficient to produce an output voltage at
TP201 or J201, pin 7 (RSSI Output).
2. Tune L102, L103, L104, L108, L109 and L110, then
repeat, for a peak voltage at TP201. Decrease the
generator output level to maintain a
2-3V reading at TP201.
FOR 12.5 kHz CHANNELS:
NOTE: Perform this test if C239 and C249 are placed
on the board.
1. Set the generator to an RF level sufficient to produce
2V DC at TP201.
2. Remove any modulation from the signal generator.
3. Increase the signal generator RF frequency 2.5 kHz.
4. Adjust C239 for peak DC voltage at TP201.
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 ...
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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 ...