[hpsdr] Meaning of ADC-L and ADC-R metering in PowerSDR

[Brian Lloyd]

On Sun, Feb 23, 2014 at 3:14 AM, Warren C. Pratt <warren at wpratt.com> wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
>
>  Interesting idea.  That might provide a "representative" level even
> though only short bursts of the sample stream, a very small fraction of the
> total stream, could be accessed.
>

I didn't realize that such data was even available. I have always found the
raw ADC numbers useful in gauging how close the radio is to overload so I
can decide how to set the "operating point" ahead of time. Once I know what
the band conditions are, I would prefer to preset the receiver for those
conditions without having to deal with the sudden onset of overload. It
will tell me if I need to use the bandpass filtering or not. I prefer not
to run the filtering and allow broadband noise and signals to performance
the randomization and dithering functions for me rather than having to use
the built-in noise source.

So, yes, I like this idea. It seems more useful to me than the raw sample
levels for a "slice". The original meaning was very useful with the
original direct-conversion I/Q radios. And with a wideband DDC radio, even
more useful since you have effect from all over the spectrum.

Anyway, here is my request for changing the way this meter function works.
And, frankly, if this value were always displayed somewhere, that would be
nice too -- kind of a full-time "headroom" meter. No need for a fancy
analog-like display. Just a running average of the peak ADC level.

-- 
Brian Lloyd, WB6RQN/J79BPL
706 Flightline Drive
Spring Branch, TX 78070
brian at lloyd.com
+1.916.877.5067
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