Yaesu FT-23R Technical Supplement page 17

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,
set the output !_eve!
antenna jack.
(2) Preset VR103 on the Mo ther Board fully
clockwise.
( 3) Adjust T 101 through T 104 on the Mother
Board for maximum
reducing the generator level if more than
four bargraph segments
(3),
After s tep generator level should be 0. 2
uV or less for 12dB SINAD. Perform the follow­
ing adjustment next.
T,o ,
T
T 1 o 3 - --. :; ;:=: ;; ;=:: :-; ;; ;
T , o
VR 10 3
and
for 40 dBu at the
S-meter indication,
turn on.
RECEIVER ALIGNMENT POINTS
10 2
4
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,
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,
that the generator output level is now 5
dBu or less.
RECEIVER ALIGNMENT SETUP
RF Signal
Generator
1 - 1 3
set the
and confirm
Oscilloscope
==
AF
==
Millivoltmeter
==
==
D
SINAD Meter
Speaker
or 8 -ohm load resistor
Regulated
12V PSU