IC-746 FAQ
4.23 What are some popular filter combinations?
"Popular" does not necessarily equal "best". Don't do something just because it's popular.
Read the above material so that you can make an informed choice.
For example, one of the "best" optional filters for an IC-746 is a 2.4Khz wide crystal filter
for the 455Khz IF (either the Icom FL-44A or the Inrad 109). The superior characteristics of
these filters over the stock ceramic filter probably improve every one of the important
receiver specs. However, the filter is unpopular. Most hams simply have trouble justifying
$100-200 for a filter "they already have" (the stock filter has the same bandwidth).
Given that caveat, here are some popular filter combinations you might want to ponder.
• None
• Single 500hz wide CW filter in either IF
• Dual 500hz wide CW filters, one in each IF
• Single narrow SSB filter in either IF
• Dual narrow SSB filters, one in either IF
• One wide CW and one narrow SSB filter at 9Mhz IF
Icom vs. Inrad? 455Khz vs. 9Mhz? Mostly a matter of preference (read above) and probably
not as important as you think, otherwise, you need to read the more detailed material above.
Page 58 of 113
2003-02-08
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