II.
RECEIVER
Set up the test equipment as shown above for
receiver alignment.
A.
Sensitivity
( 1) With the transceiver and RF signal gen
erator both tuned to band center (145 or
146 MHz), set the generator for ±3.5 kHz
deviation of 1 kHz tone modulation, and
set the output !_eve! for 40 dBu at the
antenna jack.
(2) Preset VR103 on the Mother Board fully
clockwise.
( 3) Adjust T 101 through T 104 on the Mother
Board for maximum S-meter indication,
reducing the generator level if more than
four bargraph segments turn on.
After step
(3),
generator level should be 0. 2
uV or less for 12dB SINAD. Perform the follow
ing adjustment next.
B.
S-meter Sensitivity
(1) With the transceiver and RF signal gen
erator set up as in step ( 1) of the above
Sensitivity adjustment procedure, set the
signal generator for 20 dBu output.
( 2) Adjust YR 103 on the Mother Board so that
all bargraph segments are just turned on.
(3) Reduce the generator output so that only
two bargraph segments are on, and confirm
that the generator output level is now 5
dBu or less.
RECEIVER ALIGNMENT SETUP
RF Signal
Generator
==
D
==
==
==
Oscilloscope
AF
Millivoltmeter
SINAD Meter
Speaker
or 8 -ohm load resistor
Regulated
12V PSU
RECEIVER ALIGNMENT POINTS
T,o,
T
102
T 1 o 3
T, o
4
VR103
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Summary of Contents for FT-23R MKII
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