It is likely that your 200 Hz filter is a bit wider than 200, or
rolls off so slowly so that it is much wider at only a few dB down.
On the PRO3, I think there was a "hard/soft" choice for the filter
passbands. The 7600 probably has this also. Soft had a slower rolloff.
A good way to see the actual passband is to collect white noise with
one of the sound card programs.
Jerry W4UK
At 11:56 AM 6/1/2010, you wrote:
>Here are some comparisons between the 250 Hz and 200 Hz filters in
>the IC-7600 while copying E3X last night on 30 meter RTTY.
>
>http://rttycontesting.com/icom_ic7600/e4x.htm
>
>Comments appreciated. I still be starting up a blog soon on my
>adventures with the '7600 - stayed tune!
>
>73, Don AA5AU
>
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