Icom IC-746 Instruction Manual

78
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
250 Hz/–6 dB
FL-232
RTTY /
CW NARROW FILTER 350 Hz/–6 dB
FL-100
CW NARROW FILTER
500 Hz/–6 dB
FL-223
SSB NARROW FILTER
1.9 kHz/–6 dB
FL-103
SSB WIDE FILTER
2.8 kHz/–6 dB
455 kHz optional filters:
FL-53A
CW NARROW FILTER 250 Hz/–6 dB
FL-52A CW / RTTY NARROW FILTER 500 Hz/–6 dB
FL-222 SSB NARROW FILTER 1.8 kHz/–6 dB
FL-96 SSB WIDE FILTER 2.8 kHz/–6 dB
FL-257 SSB WIDE FILTER 3.3 kHz/–6 dB
FIL
F1
F2
F3 F4 F5
2.4k-2.4k
9M455k
FIL
2.4k-2.4k
9M455k
Selects the 455 kHz filter
Selects the 9 MHz
filter
Filter program mode
When selecting the narrow filter
9 MHz filter(1)
455 kHz filter
9 MHz filter(2)
D INSTALLATION
➀
Remove the bottom cover (p. 76).
➁ Turn the transceiver upside down. Install the desired
filter as shown in the diagram below.
• The filters can be installed in either direction.
➂ Replace the bottom cover.
D USING THE FILTERS
➀
Select an installed filter in set mode (pgs. 60, 61).
➁ Push [FILTER] for 2 sec. to enter filter program
mode.
➂ Push a mode key to select the desired operating
mode.
➃ Push [FILTER] to set the selected filter condition
(normal or narrow).
➄ Push [F-2] one or more times to select the desired 9
MHz filter.
➅ Push [F-4] one or more times to select the desired
455 kHz filter.
➆ Repeat steps ➂ to ➅ to set filters for other operat-
ing modes if desired.
INSTALLING 9 MHz FILTERS INSTALLING 455 kHz FILTERS

Icom IC-746 Specifications

General

Mode	SSB, CW, RTTY, AM, FM
Receiver Type	Double conversion superheterodyne
Antenna Connector	SO-239
Voltage	13.8 V DC ±15%
Impedance	50 ohms
Output Power	100 W (SSB, CW, FM, RTTY), 40 W (AM)
Current Drain	TX: 20 A
Sensitivity	AM: 2 µV
Selectivity	CW: 500 Hz (-6 dB)