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From: | Johnathan Corgan |
Subject: | Re: [Discuss-gnuradio] Squelch developments |
Date: | Sun, 18 Jun 2006 10:20:04 -0700 |
User-agent: | Thunderbird 1.5.0.2 (X11/20060522) |
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
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