Re: [Discuss-gnuradio] Squelch developments

[Robert McGwier]

Frank wrote the keyer code that runs in PowerSDR and is distributed with 
DttSP and wrote the ramp used in it as well as the agc.   It is perfect 
shaping.  You could derive a Gaussian shape that would minimize the time 
bandwidth product but the bandwidth would widen.  It is better to spend 
slightly more time and narrow the bandwidth of the transition as the 
hear can plainly hear in the CW transmissions from the SDR-1000 or the 
onset of the agc with very strong signals on a quiet band.


Bob
N4HY


Frank Brickle wrote:
> Exactly.
>
> 73
> Frank
> AB2KT
>
> Johnathan Corgan wrote:
> > Frank Brickle wrote:
> >
> >
> > > Yes, although half a cycle of a raised cosine is almost as easy, and
> > > analytically correct.
> >
> >
> > 1/2 - cos(x)/2, for x from 0 to pi?
> >
> > Should this be applied (in reverse) as a decay window when squelch cuts
> > in, as well as the attack window we've been talking about?
> >
> > -Johnathan
>
>
>
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