The KFLA-250 is nominally 370 Hz wide at the -6 dB points.
If SHIFT is needed to center the filter on the Mark/Space signals, then the
filter needs an offset in the CONFIG parameter. Despite the claim that the
8-pole filters have zero offset, I've found a number that do. This is
especially important on these narrow bandwidth filters.
Ed W0YK
Dave K6LL wrote:
> I use the 250 Hz roofing filter and DSP BW 350 as my go-to
> RTTY settings on the K3. It seems to work well for me. Use
> the SHIFT control to make sure the mark and space are
> centrally spaced in the spectrum display. The mark and space
> should be just about the same amplitude as the center
> amplitude, with the sidebands tailing off on both sides from there.
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