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SUPPLEMENTAL ALIGNMENT PROCEDURES
7 0 - 3 4 2 / 4 4 2 ~ ~
The
alignment instructions given on the preceding page should be
adequate for normal conditions.
In case of component replacement
or misadjustment, the following procedures should be used.
1. Program the E/PROM module with the 3 following channels.
A
Band
B
Band
CH 1
156.00 MHz TX/RX
174.00 MHz TX/RX
CH 2
148.00 MHz TX/RX
160.00 MHz TX/RX
CH 3
136.00 MHz TX/RX
150.00 MHz TX/RX
1
2. Program the Center Frequency information as follows:
,
a. Press RESET then the
A
key.
b. The display will now show channel CF and step 1.
c. Enter 148.1200 MHz for
A
band models or 160.900 MHz for
B
band models for the Receiver frequency.
d.
Enter 147.2000 MHz for A band models or 160.0000 MHz for
B band models for the Transmitter frequency.
e.
The
Center Frequency will be listed after
the
channel
frequencies on the printout.
3.
Install the E/PROM module in. the radio and re-align the Main
and Transmit VCOs as follows:
a.
Select
channel 1 and while transmiting adjust L702
for
5.5 VDC at TP701.
b.
While transmitting on channel 1, adjust L107 for 5.5 VDC
at TP101.
c.
Select channel 2 and while receiving adjust L704 for
4.0
VDC at TP701.
d.
Select
channel 3 and in the receive mode confirm
TP701
reads 1.0 VDC or greater. If not, recheck steps a-c above.
4. Re-align the
Receiver and Transmitter Tracking
controls
as
follows:
a. In the receive mode select channel 3 and adjust RV752 for
1.00 VDC at TP752.
b.
In the transmit mode on channel 1, adjust RV751 for
9.00
VDC at TP751.
TRANSMIT
DRIVER
ALIGNMENT
Select
channel 3,
monitor CMlOl pin 2 (Test Set position
9)
and
adjust
CV102
for
a minimum
reading.
Adjust
the
transmitter
modulation
and
RF
output
power
as
described
in
the
basic
alignment instructions.
RECEIVER ALIGNMENT
1. Select channel 3 for the following steps.
LOCAL OSCILLATOR AMPLIFIER ADJUSTMENT
r
2.
Monitor CM202 pin 1 (Test Set position 2) and adjust L209 and
L210 for a maximum reading.
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