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LBI-31985
ALIGNMENT PROCEDURE
METER
TUNING
STEP
POSITION
CONTROL
1.
B
L103, T101
(PHASE MOD)
2.
C
T102 and T103
(MULT-1)
3.
D
T104 and T105
(MULT-2)
4.
F
T106 and C157
(MULT-3)
5.
G
C159 and Z101
(MULT-4)
6.
A
Z102
(REL OUTPUT)
7.
B
L103
(PHASE MOD)
8.
C
T101 and T102
(MULT-1)
9.
D
T103 and T104
(MULT-2)
10.
F
T105 and T106
(MULT-3)
11.
G
C157 and C159
(MULT-4)
12.
D
Z101, Z102
(INPUT DRIVE)
METER
READING
PROCEDURE
EXCITER
NOTE
When aligning transmitter, proceed as in-
structed below. DO NOT retune a previously
tuned control unless specifically directed to
do so.
See Procedure
Tune L103 for maximum meter reading. Then tune
T101 for a dip (small) in meter reading.
See Procedure
Tune T102 for maximum meter reading, then tune
T103 for a dip in meter reading.
See Procedure
Tune T104 for maximum meter reading and then
tune T105 for a dip in meter reading.
See Procedure
Tune T106 for maximum meter reading and then
tune C157 for a dip in meter reading.
See Procedure
Tune C159 for maximum meter reading, and then
tune Z101 for a dip in meter reading.
Maximum
Tune Z102 for maximum meter reading.
Maximum
Tune L103 for maximum meter reading.
Maximum
In order, tune T101 and T102 for maximum meter
reading.
Maximum
Tune T103 and then T104 for maximum metering
reading.
Maximum
Tune T105 and then T106 for maximum meter
reading.
Maximum
Tune C157 and then C159 for maximum meter
reading.
Maximum
Test set connected to Exciter metering jack. Then
alternately tune Z101 and Z102 for maximum
meter reading.
ALIGNMENT PROCEDURE
METER
STEP
POSITION
CONTROL
13.
14.
15.
16.
17.
TUNING
METER
READING
100 WATT PA
Terminate the output power J2 with a 50 ohm watt
meter capable of reading 150 watts.
Key the transmitter and set R11 (control board) for
100 watt output.
Read and record the DC voltage at feed through
cap C5. This reading can be used for future output
checks.
DO NOT EXCEED 100 watts of output power.
Using the test set connected to the Exciter
metering jack and the transmitter keyed, detune
Z102 10 percent from its peak reading. The output
PWR should remain constant at 100 watts. This
check insures ample operating margin.
Tune Z102 back to a peak reading on the test set.
Under no conditions should the Exciter be
tuned using the PA output as a level indicator.
The PA control circuits mask Exciter tuning
procedures.
851-870 MHz, 100 WATT TRANSMITTER
LBI-31985
PROCEDURE
NOTE
Issue 2
3
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