Manual Icom IC-746 (page 80 of 90) (English)

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OPTIONAL INSTALLATIONS

13-4

Optional IF ﬁlters

Several IF ﬁlters are available for the IC-746. You can

install 2 ﬁlters for the 9 MHz IF and 1 ﬁlter for the 455

kHz IF. Choose appropriate ﬁlter(s) for your operating

needs.

9 MHz optional ﬁlters:

FL-101

CW NARROW FILTER

250 Hz/–6 dB

FL-232

RTTY

CW NARROW FILTER

350 Hz/–6 dB

FL-100

CW NARROW FILTER

500 Hz/–6 dB

FL-223

SSB NARROW FILTER

1.9 kHz/–6 dB

FL-103

SSB WIDE FILTER

2.8 kHz/–6 dB

455 kHz optional ﬁlters:

FL-53A

CW NARROW FILTER

250 Hz/–6 dB

FL-52A

RTTY NARROW FILTER

500 Hz/–6 dB

FL-222

SSB NARROW FILTER

1.8 kHz/–6 dB

FL-96

SSB WIDE FILTER

2.8 kHz/–6 dB

FL-257

SSB WIDE FILTER

3.3 kHz/–6 dB

FIL

F3 F4 F5

2.4k-2.4k

9M455k

FIL

2.4k-2.4k

9M455k

Selects the 455 kHz filter

Selects the 9 MHz

filter

Filter program mode

When selecting the narrow filter

9 MHz filter(1)

455 kHz filter

9 MHz filter(2)

D INSTALLATION

➀

Remove the bottom cover (p. 76).

➁ Turn the transceiver upside down. Install the desired

ﬁlter as shown in the diagram below.

• The ﬁlters can be installed in either direction.

➂ Replace the bottom cover.

D USING THE FILTERS

➀

Select an installed ﬁlter in set mode (pgs. 60, 61).

➁ Push [FILTER] for 2 sec. to enter filter program

mode.

➂ Push a mode key to select the desired operating

mode.

➃ Push [FILTER] to set the selected filter condition

(normal or narrow).

➄ Push [F-2] one or more times to select the desired 9

MHz ﬁlter.

➅ Push [F-4] one or more times to select the desired

455 kHz ﬁlter.

➆ Repeat steps ➂ to ➅ to set ﬁlters for other operat-

ing modes if desired.

INSTALLING 9 MHz FILTERS INSTALLING 455 kHz FILTERS

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Icom IC-746 Manual

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