I was cranked down to 200 hz and would have gone tighter if I could.....btw,
congrats John on what appears to be a first place finish, I just couldn’t get
much going with low power this weekend....
Sent from my iPad
> On Feb 17, 2021, at 8:37 PM, john@kk9a.com wrote:
>
> I am sure that is true on a quiet band. I wish that I could find a 600hz
> opening anywhere on 20m in last weekend's contest. Any QRM in my passband
> makes decoding very difficult.
>
> John KK9A
>
>
>
> Ed Muns w0yk wrote:
>
> An IF bandwidth of 600 Hz is ideal with our modern software decoders.
> (Narrower bandwidth introduces phase shift that degrades copy error rate.)
> Older radios often don't allow narrow filtering in SSB mode. Yes, you want
> to shift such that the bandpass is centered on whatever tone pair you use.
>
>
>
> I do like lower tones and typically use 915/1085 which is less fatiguing
> over long periods. OTOH, their TX audio harmonic is still within the normal
> 2 kHz bandwidth for SSB transmitters when transmitting AFSK. Not a problem
> for those of us using FSK.
>
>
>
> 73,
>
> Ed W0YK
>
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