Yaesu FT-23R Technical Supplement page 41

Receiver
Set up the test equipment as shown below for re­
ceiver alignment.
( 1 ) With the transceiver and the RF signal generator
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 level for 40 dBµ at
the antenna j ack.
(2) Preset VR2003 on the Mother Board fully clock­
wise.
Receiver Alignment Setup
RF S ignal
G enerator
)
Osc i l loscope
A F
M i l l i vo l tmeter
S I N A D . M eter
Speaker
or 8 - ohm load resi stor
1 2 V
Regu l ated
P S U
Receiver A lignment Points
T 2 0 0 1
T 2 0 0 2
T 2 0 0 3
T 2 0 0 4
T 2 o o s
V R 2 0 0 3
(3) Adjust T200 1 through T2005 on the Mother Board
f o r maximum S-meter indication, reducing the gen­
erator level if more than 4 bargraph segments turn
on .
(4) After adjusting the transformers, generator level
should be 0.2 µ V or less for 12dB SINAD.
(5) Reduce the RF injection from the signal generator
to 20 dBµ.
(6) Adjust VR2003 on the Mother B oard so that all
bargraph segments are just turned on.
(7) Reduce the generator output so that only 2 seg­
ments are on, and confirm that the injection level is
5 dB µ or less.
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