High Stability Crystal Unit - Icom ic-718 Instruction Manual

 CR-338

HIGH STABILITY CRYSTAL UNIT

The CR-338 improves the total frequency stability of
the receiver.
Installation
q Remove the bottom cover as shown in the dia-
gram before.
w Disconnect W2 from J4401 (MAIN unit) and W3
from J4201 (MAIN unit).
e Remove the 9 screws from the PLL unit, discon-
nect P4 from J201 (MAIN unit) and P2 from J401
(MAIN unit), then remove the PLL unit.
PLL unit
C 16
W 2
W 3
J 4201
J 4401
P 4
J 201
MAIN unit
J 401
P 2; Frequency check point
(Connect a frequency counter
and adjust the frequency to
64.00000 MHz with C 16.)
INSTALLATION AND CONNECTIONS
r Remove the supplied internal crystal and replace it
with the CR-338.
t Return the PLL unit, plugs and fl at cables to their
original positions.
y Adjust the reference frequency at C16 using a fre-
quency counter, if desired.
• Connect the frequency counter to P 2 (PLL unit).
u Return the bottom cover to its original position.
CR-338
9
Internal crystal
PLL unit
Solder 4 leads
49