Optional If Filters - Icom IC-746 Instruction Manual

13
OPTIONAL INSTALLATIONS
13-4 Optional IF filters
Several IF filters are available for the IC-746. You can
install 2 filters for the 9 MHz IF and 1 filter for the 455
kHz IF. Choose appropriate filter(s) for your operating
needs.
9 MHz optional filters:
FL-101
CW NARROW FILTER
FL-232 /
RTTY CW NARROW FILTER
FL-100
CW NARROW FILTER
FL-223
SSB NARROW FILTER
FL-103
SSB WIDE FILTER
455 kHz optional filters:
FL-53A
CW NARROW FILTER
FL-52A /
CW RTTY NARROW FILTER
FL-222
SSB NARROW FILTER
FL-96
SSB WIDE FILTER
FL-257
SSB WIDE FILTER
Filter program mode
F2
F1
Selects the 9 MHz
filter
When selecting the narrow filter
INSTALLING 9 MHz FILTERS
78
250 Hz/–6 dB
350 Hz/–6 dB
500 Hz/–6 dB
1.9 kHz/–6 dB
2.8 kHz/–6 dB
250 Hz/–6 dB
500 Hz/–6 dB
1.8 kHz/–6 dB
2.8 kHz/–6 dB
3.3 kHz/–6 dB
F3 F4 F5
Selects the 455 kHz filter
9 MHz filter(1)
9 MHz filter(2)
D INSTALLATION
Remove the bottom cover (p. 76).
Turn the transceiver upside down. Install the desired
filter as shown in the diagram below.
• The filters can be installed in either direction.
Replace the bottom cover.
D USING THE FILTERS
Select an installed filter in set mode (pgs. 60, 61).
Push [FILTER] for 2 sec. to enter filter program
mode.
Push a mode key to select the desired operating
mode.
Push [FILTER] to set the selected filter condition
(normal or narrow).
Push [F-2] one or more times to select the desired 9
MHz filter.
Push [F-4] one or more times to select the desired
455 kHz filter.
Repeat steps to to set filters for other operat-
ing modes if desired.
INSTALLING 455 kHz FILTERS
455 kHz filter