I Optional Filter Selection - Icom IC-703 Instruction Manual

5
FUNCTION FOR RECEIVE
I Optional filter selection
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
" " ; see p. 79).
FILTER ON/OFF:
q Select
.
• Push [DISPLAY] once or twice to select .
• Push [MENU] one or more times to select
w Push [
] momentarily to select the narrow
(F-1)
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.
• Filter variations
Name Mode
FL-53A* CW, RTTY
FL-52A* CW, RTTY
FL-222* SSB, CW, RTTY
FL-65 SSB, CW, RTTY
FL-96** SSB, CW, RTTY
FL-257* SSB, CW, RTTY
*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.
• Optional filter installation and selection tables
SSB, CW, RTTY
Bandwidth
Narrow
Filter
No optional
———
filter
FL-52A FL-52A (500)
FL-53A FL-53A (250)
FL-96 ———
FL-222 FL222 (1.8 k)
FL-257 ———
49
.
Bandwidth
250 Hz/–6 dB
500 Hz/–6 dB
1.8 kHz/–6 dB
2.3 kHz/–6 dB
2.8 kHz/–6 dB
3.3 kHz/–6 dB
Medium Wide
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-65 (2.3 k) ———
FL-65 (2.3 k) FL-257 (3.3 k)
NOTE: When selecting the narrow filter (or wide fil-
ter), the graphic passband is changed. (see dia-
gram below)
wide is Normal
selected operation
[F-1]
[MENU]
Normal
AM
Narrow
Normal
FM
Narrow
narrow is
selected
[DISPLAY]
CFWS455G (8 k)
FL-65 (2.4 k)
Through (15 k)
CFWS455G (8 k)