800 MHz RECEIVER
4-8
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.
4.3 800 MHz RECEIVER ALIGNMENT
C
R
I
T
I
C
A
L
A
D
J
U
S
T
M
E
N
T
The TCXO must be adjusted within 5 minutes of turn-
ing the power on to the RDM. Do not under any cir-
cumstances try to set frequency later on in any of the
tests, as TCXO frequency stability cannot then be
guaranteed.
Refer to Figure 4-28 or 4-29 for component loca-
tions. Refer to Figure 4-30 for equipment needed and
setup diagram.
4.3.1 PRE-TEST
1. Preset L201, L203, L204, L206, L223 and L224
tuning screws about 1/4 inch above the top of the
casting.
2. Preset L202 and L205 tuning screws just barely
above the tightening lock nuts.
Apply power to the Receiver by plugging the
20-pin cable from the RF Interface Board into J201
(see Figure 4-28 or 4-29).
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
R309/R310 junction - +3.5V DC
±
0.1V
4.3.2 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 TP5.
NOTE: The Channel Number, Channel Frequency and
Synthesizer Frequency appear at the bottom of the
screen.
4.3.3 TCXO FREQUENCY ADJUST
1. Place a pick-up loop (sniffer) or RF probe connected
to a frequency counter near L210.
2. Set Y201 (TCXO) for the Injection Frequency
±50 Hz (Inj Freq = chnl freq - 52.95 MHz).
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 ...
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 ...
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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 ...