The filter selection switches the IF passband width as
shown in the table at right.
The filter selection is automatically memorized in each
mode.
When an optional filter is installed, set the optional fil-
ter setting in set mode. (p. 55) Optional filters are not
selected by default.
q If the start up screen is not selected (if [F-5]’s func-
tion is [EXIT]), push [F-5] one or more times to exit.
w Push the desired mode switch.
e Push [(F-2)FILTER] to enter the filter selection
screen.
- The lines show the selectable combination of IF filters.
r Push [(F-2)9MHz] or [(F-4)455kHz] one or more
times to select the 9 MHz or 455 kHz IF filter, re-
spectively.
- Push [(F-3)DEF] to select a default filter combination for
the selected mode.
t Repeat steps w to r if desired.
y Push [(F-5)EXIT] to exit the filter selection screen.
•Filter selection screen
•Optional filter information
FL-257 information
The IC-756 can use the optional FL-257 SSB WIDE
FILTER. It has 3.3 kHz/–6 dB passband width.
To use the FL-257, select FL-222 and SSB narrow
mode.
■ Filter selection
28
4
RECEIVE AND TRANSMIT
IF Filter
Passband
width
Used
selectivity
9 MHz
FL-100 500 Hz/–6 dB CW-N, RTTY-N
FL-223 1.9 kHz/–6 dB
SSB-N, CW-N,
RTTY-N
FL-232 350 Hz/–6 dB CW-N, RTTY-N
455 kHz
FL-52A 500 Hz/–6 dB CW-N, RTTY-N
FL-53A 250 Hz/–6 dB CW-N, RTTY-N
FL-222 1.8 kHz/–6 dB
SSB-N, CW-N,
RTTY-N
•Filter construction
FL-101 250 Hz/–6 dB CW-N, RTTY-N
