Yaesu FT-23R Technical Supplement page 16

&
I. PLL TRANSMITTER
Set up the test
diagram below for transmitter alignment. Ad­
just the supply voltage to 12.0V for all steps
except Transmitter Output Power alignment (B).
A.
PLL VCV (Varactor Control Voltage)
( 1) Connect the DC voltmeter between C416 on
the PLL Unit and chassis ground.
( 2) While transmitting
transformer T501 on the VCO Unit for 1.35
±0.05 VDC.
(3) While receiving
trimmer TC501 on the VCO Unit for 1.1
±0.05 VDC.
(4) Retu ne the transceiver
high-end VCV
being aligned,
Version Frequency
A, C, E 148.000
B, D 146.000
PLL & TRANSMITTER ALIGNMENT SETUP
50-ohm lnline
Dummy Load Wattmeter
Freq. Counter
Spectrum Deviation
Aralizer.
Meter
AF
Oscilloscope
Millivoltmeter
TC101
TCso1
TC401
equipment as shown
on 144.000 MHz
•.
on 144 000 MHz
and confirm the
for the transceiver
as follows:
Tx VCV
Rx VCV
<l.8V
<l.7V
=
=
=
&
PLL TRANSMITTER ALIGNMENT POINTS·
V R10 4
T so1
B.
Transmitter Output Power
in the (1) Tune the transceiver to band center (14 5
or 146 MHz),
the undepressed position.
(2) Increase the supply voltage to 12.5V.
( 3)
Adjust TC 101 on the Mother Board for peak
output power on the wattmeter (at least
5W with less
(4) Press
adjust
and adjust VR105 on the Mother Board for
0.5 watts output.
( 5) Return
adjust
C. PLL Reference Frequency
With the transceiver tuned to
version
or 146 MHz),
necessary,
ches the frequency
<l.6V
<
l. 5 V
D.
Modulation Level
( 1) With the
( 145 or 146 MHz),
for 25m V output at 1 kHz to the MIC jack.
AF Gen erat or
(2) Adjust VR104 on the Mother Board for ±4.5
kHz deviation
AF
Millivoltmeter
Regulated
12V PSU
1 - 1 ')
and set the LOW switch to
than 1.5A supply current).
the LOW switch on the top panel,
the supply voltage to
band center
adjust TC401 on the PLL Unit,
so that the display frequency mat­
counter when transmitting.
transceiver tuned to band center
adjust the AF generator
on the deviation meter.
12.0 V.
( 145
if