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5.12 FIX
(Fixed Channel Oscillator)
BOARD
(X50-1120-10)
(See Figure 32)
This board holds a crystal-controlled
oscillator which can
be used in place of the VFO to operate the transceiver on a
fixed channel.
To install the crystals, remove the two screws which hold
the
FIX
board,
then
carefully
lift the board
from
the
transceiver while exercising care.
Refer
back to Section
4.14 for crystal specifications and
operating instructions. Trimmers TC1 (Channel 1) and TC2
(Channel 2) should be used, if necessary, to net the crystals
exactly on frequency. VR1
(Channel 1) and VR2 (Channel
2) should be adjusted for maximum output. If the crystal
does not oscillate, adjust TC4.
i
A W o h bee ae
FIGURE 32.
FIX Board
5
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ig BY
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6
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6
ik
eke
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a
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s
Vcr BIAS
6
&.
a.
53
s5
x2
&
98;
(-——-—---
cl .o1
CHI
RMT
GNO
MIX
GND
—————_,——
ot
CH Selecter
sw
Q123: 28c460(B)
Di,2: 1s 1555
Ds,4:1N 60
Xtal_ OSC} Output
VFO
VFO Input
Xtal (CHI, CH2); HC-26/0 (5.0~5.5MHz)
FIX
CH
Unit (X50-1120-10)
FIGURE 33.
FIX Schematic
31
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