Manual Icom IC-703 (page 102 of 112) (English)

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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

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)

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Icom IC-703 Manual

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