Operation Manual

49
5
FUNCTION FOR RECEIVE
■ Optional filter selection
• Filter variations
*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:
q Select M3.
•Push [DISPLAY] once or twice to select M.
• Push [MENU] one or more times to select M3.
w Push [
(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
Mode BandwidthName
FL-222*
FL-52A*
FL-96**
SSB, CW, RTTY 3.3 kHz/–6 dBFL-257*
FM
Normal Through (15 k)
Narrow CFWS455G (8 k)
AM
Normal CFWS455G (8 k)
Narrow FL-65 (2.4 k)
SSB, CW, RTTY
•
Optional filter installation and selection tables
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)
Bandwidth
Narrow Medium Wide
Filter