Re: [Discuss-gnuradio] Squelch developments

[Johnathan Corgan]

Robert McGwier wrote:

> 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.

The power_squelch_cc block I just checked in implements the raised
cosine shape for attack and decay as Frank suggested.

-Johnathan, AE6HO