My experience with roofing filters is from using Orion and Orion ii.
On my first transceiver, Orion, I ordered the narrow filters, and found anything less than about 600 cycles not to be useful.
>From a practical point of view, a roof of even 1 kc was more than adequate for CW, RTTY, and PSK operation
On my second transceiver, Orion II, I did not waste my money on these 200 cycle filters. If you are a purist, maybe once
a month you will be in qso with a IK3 station on PSK (31 cycles wide) and find a W2 cranking up 50 cycles away at high power, and
your AGC will be affected by it. Then it might be helpbul to use a very narrow filter, but in my opinion, this seldom to none experience it is not worth the bucks.
DSP bandwidth adjustments will handle most situations just fine.
I suggest nothing smaller than 400 cycles as a roofing filter.
Ken K5WK
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