837Re: Decoding Speed
- Dec 31, 2003"KC8UDX" <KC8UDX@n...> wrote:
> Tried different adjustments on Kenwood with justA kenwood 520 is going to have a fixed (probably 2.8kHz) SSB filter.
> minor changes to sig/noise ratio.
Look at your waterfall display- do you notice that it's noticeably
dimmer towards the right side? This might indicate you've got too
much rolloff on the high end. If all the "bars" look reasonably
equally bright then bandwidth probably isn't a problem. With a 520
there aren't a lot of adjustments you can make, except playing with
RF gain and AF volume. Just make sure you're not overdriving the
input to the soundcard.
> Any filter programs out there that might helpI would recommend as little filtering or processing of the signal as
> cleanup the signal?
possible. This modulation scheme is sensitive to phase and amplitude
distortion and filtering can only make it worse. I run my bandwidth
filters wide open and have had the best success with that. Attempts
to use filters to cut down on adjacent channel interference or using
the automatic notch to wipe out the perpetual "tuner-uppers" only
results in bad blocks or no decode anyway. Give the decode engine
the whole signal and let the error correction deal with any
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