ICOM IC-703 Manual Do Utilizador

49

5

FUNCTION FOR RECEIVE

■Optional filter selection

*Optional filter.

**Although the FL-96 is not listed on the option list, IC-703 would

take FL-96 as well as other optional filter.

One optional filter can be installed in the IC-703.

Narrow filters help reject interference from adjacent
signals and obtain good selectivity.

Wide filters provide improved audio for SSB operation
when no interfering signals are present.

Consult the table below to select a filter most suitable
for your operating needs.

Narrow filters for AM/FM modes are standard.

FILTER PRESETTING:
After you install a filter (see p. 87 for installation), you
must specify the installed filter in initial set mode (item
“

22 OPT. FIL” ; see p. 79).

FILTER ON/OFF:
qSelect M3.

• Push [DISPLAY] once or twice to select 

M.

• Push [MENU] one or more times to select 

M3.

wPush [

(F-1)

FIL] momentarily to select the narrow

filter; push for 1 sec. to select the wide filter.

•

ã appears when the narrow filter is selected; ç ap-
pears when the wide filter is selected.

NOTE: When selecting the narrow filter (or wide fil-
ter), the graphic passband is changed. (see dia-
gram below)

[DISPLAY]

[MENU]

[F-1]

Normal
operation

wide is
selected

narrow is
selected

FL-53A*

CW, RTTY

250 Hz/–6 dB

CW, RTTY

500 Hz/–6 dB

SSB, CW, RTTY

1.8 kHz/–6 dB

FL-65

SSB, CW, RTTY

2.3 kHz/–6 dB

SSB, CW, RTTY

2.8 kHz/–6 dB

FL-222*

FL-52A*

FL-96**

SSB, CW, RTTY

3.3 kHz/–6 dB

FL-257*

FM

Normal

Through (15 k)

Narrow

CFWS455G (8 k)

AM

Normal

CFWS455G (8 k)

Narrow

FL-65 (2.4 k)

No optional 

filter

FL-52A

FL-53A

FL-96

FL-222

FL-257

———

FL-52A (500)

FL-53A (250)

———

FL222 (1.8 k)

———

FL-65 (2.3 k)

FL-65 (2.3 k) 

FL-65 (2.3 k)

FL-65 (2.3 k)

FL-65 (2.3 k)

FL-65 (2.3 k)

———

———

———

FL-96 (2.8 k)

———

FL-257 (3.3 k)