Viking 242-2009-632 - Manual (Page 131)

ALIGNMENT AND TEST PROCEDURES
7-3
March 1999
Part No. 001-2009-600
Figure 7-1 RECEIVER ALIGNMENT POINTS
L220
L201 L202 L203 L204 L205 L206
L223 L224
TP5
L207
L229
L209
L211
L231 L225
Z213
R284
R261 R264
U206
TP3 TP4
J201
1
2
19
20
TP6 U2
0
7
Y201
TP1
U2
0
8
U
210
U208
1 4
5 8 1
4 5
8
A006
TP2
7.3.2 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
±
0.2V
U404, pin 7 +3.5V DC
±
0.1V
7.3.3 PROGRAM TUNE-UP CHANNEL
1. Program the Transmit Channel.
2. Use the "Turn on carrier" button to key the Exciter.
3. Tune VCO helical L404 for 4.5V
±
0.05V on U403,
pin 6 (TP1).
4. Measure the Power Output of the Exciter at J402.
Reading should be +17.5 dBm
±
0.5 dB.
5. Use the "Turn on carrier" button to unkey the
Exciter.
7.3 EXCITER ALIGNMENT
Refer to Figure 7-2 for component locations.
Refer to Figure 7-10 for equipment needed and setup
diagram.
WARNING
SAFETY MEASURES ARE DISABLED IN TEST
MODE. ALARMS ARE ACTIVE. HOWEVER,
FEATURES SUCH AS THERMAL SHUTDOWN IN
THE PA ARE DISABLED.
7.3.1 PRETEST
1. Set TCXO modulation adjust R425 fully counter-
clockwise.
2. Connect the power meter to J402.
3. Connect OCXO to J403.
NOTE: 2000 Series OCXO must be powered up for 1/
2 hour or longer to stabilize frequency.