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IC-746 FAQ
4
IF Filters
4.1
How many optional IF filters can I install into the IC-746?
There are two (2) slots for optional filters in the 9Mhz IF, and one (1) slot for an optional
filter in the 455Khz IF.
4.2
What optional IF filters are available for the IC-746?
Available filters for the 9Mhz IF include:
Filter
IF Bandwidth
SF
Typical Use
Inrad 121
9 Mhz
250 hz
2.2
CW narrow
Icom FL-101
9 Mhz
250 hz
3.0
CW narrow
Icom FL-232
9 Mhz
350 hz
2.8
CW / RTTY narrow
Inrad 111
9 Mhz
400 hz
2.3
CW / RTTY narrow
Icom FL-100
9 Mhz
500 hz
2.5
CW / RTTY narrow
Inrad 320
9 Mhz
1,800 hz
1.5
SSB
Icom FL-223
9 Mhz
1,900 hz
1.9
SSB narrow
Inrad 110
9 Mhz
2,100 hz
1.5
SSB
Inrad 123
9 Mhz
2,800 hz
1.5
SSB wide
Icom FL-103
9 Mhz
2,800 hz
1.8
SSB wide
Inrad 306
455 Khz
125 hz
2.1
CW narrow (might not fit)
Inrad 122
455 Khz
250 hz
1.8
CW narrow
Icom FL-53A
455 Khz
250 hz
1.9
CW narrow
Inrad 116
455 Khz
400 hz
1.7
CW
Icom FL-52A
455 Khz
500 hz
2.0
CW / RTTY narrow
Inrad 322
455 Khz
1,800 hz
1.5
SSB narrow
Icom FL-222
455 Khz
1,800 hz
1.7
SSB narrow
Inrad 314
455 Khz
2,100 hz
1.5
SSB
Inrad 109
455 Khz
2,400 hz
1.6
SSB
Icom FL-44A
455 Khz
2,400 hz
1.75
SSB
Icom FL-96
455 Khz
2,800 hz
2.0
SSB wide
Inrad 124
455 Khz
2,800 hz
?
SSB wide
Icom FL-257
455 Khz
3,300 hz
?
SSB wide
Notes:
The above specifications come from several sources, so they might not be directly
comparable. Also, there are always variations from one manufacturing lot to another. Use
these figures only as a guide.
Page 51 of 113
2003-02-08