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15
OPTION UNIT INSTALLATIONS AND SETTINGS
■
IF filter
Several IF filters are available for the IC-703. Choose
a filter most appropriate to your operating needs.
NOTE:
After filter installation, specify the installed
filter using initial set mode (item 22, p.79). Other-
wise, the installed filter will not function properly.
FL-52A
CW
/
RTTY NARROW FILTER
500 Hz/–6 dB
FL-53A
CW NARROW FILTER
250 Hz/–6 dB
FL-222
SSB NARROW FILTER
1.8 kHz/–6 dB
FL-257
SSB WIDE FILTER
3.3 kHz/–6 dB
q
Remove the top cover as shown on the previous
page.
w
Disconnect the coaxial cable connectors, P2 and
P4, then unscrew 10 screws on the MAIN unit.
• Attach the grounding spring at the same place when re-
turning.
e
Slide the MAIN unit in the direction of the arrow
q
,
then open the MAIN unit in the direction of the
arrow
w
.
• Be careful for the flat cables.
r
Install the desired filter as shown in the diagram
below.
t
Tighten the nuts then solder the filter’s pins.
y
Return the MAIN unit to the original position.
• Make sure to attach the grounding spring to the original
position.
u
Connect P2 and P4 to J2 and J1, respectively.
i
Replace the top cover.
Soldering points
Nuts
Flat washers
Optional
IF filter
Red belt
Flat cable
Grounding
spring
Front side
Rear side
P2 (J2)
P4 (J1)
q
w