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The ‘Power Squelch’ block in GRC is my favourite and I would recommend
using this one.
Have a look at the following GRC flow graph for a working example that
uses
the power squelch block:
https://raw.githubusercontent.com/m0mik/scanoo/master/apps/scanoo.com_rx.grc
Note that the ‘Ramp’ setting is the number of samples it takes at the
start
and end of a detected signal for the volume to go from 0% to 100% and
100%
to 0%, and the ‘Alpha’ setting is the signal average alpha just like in
the
FFT WX GUI widget. 1 disables the averaging and will give you the
fastest
cutoff at the end, however if you have signal flutter then the audio
will
be choppy. I’d recommend using between ‘0.01’ and ‘0.001’ in the power
squelch block for the ‘alpha’ setting.
Mike
–
Mike J. M0MIK BSc MIET
Ettus R. Technical Support
Email: [email protected]
Web: http://ettus.com