High Stability Crystal Unit - Icom IC-746PRO Instruction Manual
Hf/vhf all mode transceiver
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Also See for IC-746PRO:
- Manual (164 pages) ,
- Instruction manual (59 pages) ,
- Service manual (7 pages)
Table of Contents
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12
OPTION INSTALLATION
I CR-338
HIGH STABILITY CRYSTAL UNIT
By installing the CR-338, the total frequency stability
of the transceiver will be improved.
q Remove the bottom covers as shown on the previ-
ous page.
w Remove the 4 screws from the shield cover of the
RF unit, and disconnect P2 (CHASSIS) from J761
(MAIN), then lift up the shield cover.
e Remove the 8 screws from the RF unit, disconnect
J1, J121 and J151, then remove the RF unit.
r Remove the supplied internal crystal and replace
with the CR-338.
t Return the RF unit, J1, J121 and J151 to their orig-
inal positions.
y Connect a frequency counter to the J262, 2LO IN,
then adjust the reference frequency to be
64.00000 MHz with the L1901 on the RF unit.
u Return the J262, shield cover, P2 and bottom cov-
ers to their original positions.
91
Shield cover
TUNER
(antenna tuner)
connector
Black belt
Blue
J1
belt
Black
J151
Blue
J121
Red
Red belt
Soldering
points
Connect a frequency counter, then adjust
the frequency to be 64.00000 MHz.
RF unit
J262
2LO IN
L1901
P2
(CHASSIS)
RF unit
J761
(MAIN unit)
CR-338
Supplied crystal
RF unit
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Questions and answers
Make icom IC 746 pro general coverage all band
The Icom IC-746PRO provides general coverage reception from 0.03–60MHz and 108–174MHz. However, specifications are only guaranteed for 0.5–29.99MHz, 50–54MHz, and 144–148MHz. To enable general coverage, select the desired band using the keypad above the tuning knob and then use the tuning knob to adjust the frequency as needed.
This answer is automatically generated