Filter Selection - Icom IC-756 Instruction Manual

Filter selection

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 [
FILTER] to enter the filter selection
(F-2)
screen.
- The lines show the selectable combination of IF filters.
r Push [
9MHz] or [
(F-2)
times to select the 9 MHz or 455 kHz IF filter, re-
spectively.
- Push [ DEF] to select a default filter combination for
(F-3)
the selected mode.
t Repeat steps w to r if desired.
y Push [
EXIT] to exit the filter selection screen.
(F-5)
• Filter construction
2nd IF signal
• Filter selection screen
Selected filter
(9 MHz)
455kHz] one or more
(F-4)
9 MHz IF filter
FL-23 (15 kHz)
FL-80 (2.4 kHz)
FL-223 (1.9 kHz)
FL-100 (500 Hz)
FL-232 (350 Hz)
FL-101 (250 Hz)
optional
14.195.00
14.205.00
F-1 F-2 F-3
9 MHz filter Default filter
selection selection
RECEIVE AND TRANSMIT
• Optional filter information
Passband
IF Filter
FL-100 500 Hz/–6 dB
FL-101 250 Hz/–6 dB
9 MHz
FL-223 1.9 kHz/–6 dB
FL-232 350 Hz/–6 dB
FL-52A 500 Hz/–6 dB
FL-53A 250 Hz/–6 dB
455 kHz
FL-222 1.8 kHz/–6 dB
FL-257 information
The IC-756 can use the optional FL-257
. It has 3.3 kHz/–6 dB passband width.
FILTER
To use the FL-257, select FL-222 and SSB narrow
mode.
455 kHz IF filter
SFPC455E (15 kHz)
Mixer
SFPC455G (9 kHz)
FL-96 (2.8 kHz)
FL-222 (1.8 kHz)
FL-52A (500 Hz)
FL-53A (250 Hz)
optional
Selectable combinations
Selected filter
(455 kHz)
F-4 F-5
455 kHz filter
selection
Used
width selectivity
CW-N, RTTY-N
CW-N, RTTY-N
SSB-N, CW-N,
RTTY-N
CW-N, RTTY-N
CW-N, RTTY-N
CW-N, RTTY-N
SSB-N, CW-N,
RTTY-N
SSB WIDE
3rd IF signal
4
28