ALIGNMENT AND TEST PROCEDURES
7-4
August 2000
Part No. 001-2001-200
7.2 EXCITER 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 AC power on to the repeater. Do not under any
circumstances try to set frequency later on in any of
the tests, as TCXO frequency stability cannot then be
guaranteed.
Refer to Figure 7-2 for component locations.
Refer to Figure 7-7 for equipment needed and setup
diagram.
NOTE: Some adjustments will be made using the cur-
sor "Up"/"Dn" or "PgUp"/"PgDn" keys.
W A R N I N G
SAFETY MEASURES ARE DISABLED IN TEST
MODE. ALARMS ARE ACTIVE. HOWEVER, FEA-
TURES SUCH AS THERMAL SHUTDOWN IN THE
PA ARE DISABLED.
7.2.1 PRETEST
1. Set TCXO modulation adjust RV101 fully counter-
clockwise.
2. Connect the power meter to J402.
7.2.2 VOLTAGE MEASUREMENTS
Apply power to the Exciter by plugging the
20-pin cable from the RF Interface Board into J401.
Measure the voltages at the following pins.
U406, pin 1
+12V DC
±
0.4V
U405, pin 1
+5V DC
±
0.3V
U402, pin 1
+3.5V DC
±
0.1V
U404, pin 7
+3.5V DC
±
0.1V
Figure 7-2 EXCITER ALIGNMENT POINTS
7.2.3 PROGRAM TUNE-UP CHANNEL
For Exciters operating between:
138-144 MHz or 154-172 MHz.
1. Using the PC and software, program the Synthesizer
for the Transmit frequency.
2. Press the space bar to key the Exciter.
3. Tune the VCO inductor L102 for +4.5V DC
±
0.05V
at TP1 (U403, pin 6).
Increase the transmit frequency by 3 MHz.
The voltage on TP1 shall be less than 7.5V.
Decrease the transmit frequency by 3 MHz.
The voltage on TP1 shall be greater than 2V.
TP
MOD
TP
CNTRL
Q411
Q410
Q407
Q406
A007
U406
Y401
RV401
U404
Q413
Q412
U407
1
U402
RV101
U405
1
2
20
19
J401
J402
Q417
Q415
Q414
Q416
Q404
Q403
U403
3
TP1
6
Содержание VIKING VX
Страница 2: ...1 2 October 1995 Part No 001 2008 202 ...
Страница 14: ...TABLE OF CONTENTS CONT 10 ...
Страница 24: ...INTRODUCTION AND OPERATION 1 10 August 2000 Part No 001 2001 200 ...
Страница 94: ...CIRCUIT DESCRIPTION 6 44 August 2000 Part No 001 2001 200 ...
Страница 118: ...ALIGNMENT AND TEST PROCEDURES 7 20 August 2000 Part No 001 2001 200 ...
Страница 126: ...SERVICING 8 8 August 2000 Part No 001 2001 200 ...
Страница 160: ...PARTS LIST 9 34 August 2000 Part No 001 2001 200 ...
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