I just finishing operating in the ARRL 160 meter
contest with my FT1000D. I have 250 Hz and 500
Hz INRAD filters in the 455 kHz IF, and Yaesu
250 and 500 Hz filters in the 8 MHz. IF. I
also have the K1ZM APF modification. It makes
signals pop out of the noise like magic, yet the
ringing is tolerable. Although the INRAD filters
are excellent, I have been spoiled by the modified APF.
Now that I am used to the APF, the 250 Hz filter
position without APF seems like it's almost wide enough
for SSB, and the 500 Hz position seems positively
broad as a barn door. If you have an FT1000D,
and do weak signal CW work, I would highly
encourage you to try this mod. BTW, I never used
the original APF much because it was fairly ineffective.
Rick N6RK
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