900 MHz RECEIVER
5-8
July 2000
Part No. 001-2000-720
11. Type in a valid DOS filename.
For this example site1.dat is used.
12.The file consists of default and CVR one under the
filename of site1.dat.
Adding A CVR To A File
The example used for Site 1 will again be used to
add CVRs to the filename site1.dat.
1. Highlight EDIT, press Enter.
2. Highlight SELECT REPEATER, press Enter.
3. The repeater list shown for this file includes default
and repeater one. These contain the same parame-
ters with the exception that when selected for edit
the programmed repeater can be overwritten and the
data lost.
4. Highlight DEFAULT, press Enter.
5. Highlight EDIT, press Enter.
6. Highlight SETUP PARAMETERS, press Enter.
7. Change the Repeater number and other parameters
as required for this repeater, press F2.
8. Highlight EDIT, press Enter.
9. Highlight FILES, press Enter.
10.Highlight SAVE, press Enter.
11. Repeater 2 is added to the Repeater List in file
site1.dat.
5.3 RECEIVER ALIGNMENT
Refer to Figure 5-28 for component locations.
Refer to Figure 5-29 for equipment needed and setup
diagram.
5.3.1 PRE-TEST
1. Preset L201, L202, L203, L204, L205, L206, L223
and L224 tuning screws about 1/4 inch above the top
of the casting.
5.3.2 VOLTAGE MEASUREMENTS
Apply power to the Receiver by plugging the 20-
pin cable from the RF Interface Board into J201 (see
Figure 5-28).
Measure the voltages at the following pins.
U206, pin 1
+12V DC
±
0.4V
U207, pin 1
+12V DC
±
0.4V
U208, pin 1
+6V DC
±
0.2V
U210, pin 1
+12V DC
±
0.4V
5.3.3 PROGRAM TUNE-UP CHANNEL
1. Using the PC and software, program the Synthesizer
for the Receive channel number.
2. Tune the VCO helical L220 for +4.5V DC
±
0.05V
on U209, pin 6 or TP2.
3. Alternately tune L223 and L224 in 1/2-turn to 1-turn
increments until a voltage is measured on J201, pin
13 or TP5. At that time, tune L223 for a peak, then
L224 for a peak.
4. Retune L223 and L224 for a peak at J201,
pin 13.
NOTE: The Channel Number, Channel Frequency and
Synthesizer Frequency appear at the bottom of the
screen.
5.3.4 TCXO FREQUENCY ADJUST
1. Set Y201 (TCXO) for 3.5V DC
±
0.05V DC at TP1
(response time is very slow).
5.3.5 VCO TEST
1. The Synthesizer is programmed for 199 channels
above the Receive Channel.
2. The voltage on U209, pin 6 (TP2) should be
< 7.5V DC.
3. Record the voltage on J201, pin 13 (TP5) ____.
4. The Synthesizer is programmed for 199 channels
below the Receive Channel.
Содержание CONVENTIONAL VOTING RECEIVER
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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 ...
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 ...