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12
OPTIONAL INSTALLATIONS
■ CR-293
HIGH STABILITY CRYSTAL UNIT
A temperature-compensating crystal with a stability of
±3 ppm is built-in to the receiver. For more demand-
ing operation, the CR-293
HIGH STABILITY CRYSTAL
UNIT
is available. It has a stability of ±0.5 ppm.
qRemove the bottom cover as shown on p. 37.
wRemove 6 screws from the metal plate, then
remove the metal plate and shield cover.
eRemove 10 screws from the PLL unit, then open
the unit to expose the bottom.
rUnsolder the feet of the internal crystal unit, then
remove it.
tPlace the CR-293 in the space available as shown
in the diagram, then solder its feet into place (6
points).
yAdjust the reference frequency using a frequency
counter.
uReplace the ground spring to its original position.
iReturn the shield cover, metal plate and bottom
cover to their original positions.
NOTE: The CR-293 is an oven-type crystal unit,
and the specified frequency stability described
above is guaranteed 1 min. after power ON.
Shield
cover
PLL unit
Ground
spring
PLL unit
CR-293
Internal
crystal
unit
Metal plate