Re: SNR meter, bandwidth and gain adjustment for transverters

Simon Brown


Is this Continuum mode? I would need an exact specification were I to add

Simon Brown, G4ELI

-----Original Message-----
From: <> On Behalf Of Bob
Sent: 05 July 2021 17:26
Subject: Re: [SDR-Radio] SNR meter, bandwidth and gain adjustment for

At 7/5/2021 07:43 AM, you wrote:
Per the info on Simon's page explaining the operation of the S-meter, "[The
signal level] is the peak spectrum FFT bin (output value) which is within
the current filter."That page is found here:Â
explains it clearly. There is no correlation of peak FFT bin value to filter
bandwidth (or AGC level, or any other consideration), nor should there be.
Any modern SDR-based S-meter that changes its reading based on filter
bandwidth is doing it wrong.I've said it before: Simon got it right, many
others are getting it wrong.Mark

I strongly disagree. How else is one supposed to make total channel power
measurements for radiometry? SDRs aren't just for communications, & any
developer that codes their SDR apps otherwise is hamstringing their full
potential. Right now the only apps I know of that can do this are HDSDR &
SDRuno. HDSDR is compatible with all my SDRs so that covers my needs, but
it would be nice if SDRC could display & record average channel power
readings as well as HDSDR is fairly useless for NBFM monitoring (no

I'll have to go through the forum archives to see if this has been
requested, & do so if not.

Bob NO6B

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