[hpsdr] Signal level discrepancy RA Utility / Multimeter

[Warren C. Pratt]

Hi Jim,

No real mysteries.  The DSP does the meter calculations based upon the 
input "voltage" it receives.  It uses no correction factors. The console 
adds various correction factors for things like the "gain" of the 
digital hardware, calibration of the analog hardware, the attenuator 
setting, etc.  While those are being applied to the S-meter, some of 
them are not currently being applied to the RA utility ... which Joe 
intends to correct.

Of course, there are other matters which one must take into account when 
measuring noise such as it makes a difference whether one takes the 
average of the log or the log of the average ... log of the average 
being the correct answer.

73,
Warren  NR0V

On 2/10/2016 10:29 AM, Jim Barber wrote:
> Gents,
> It sounds then that there is more to the s-meter calculation than 
> simple average or peak magnitude within the filter passband? (and 
> offsets for engaged attenuators)
>
> No detailed explanations expected - if there is indeed more to it I 
> can investigate the sources to satisfy my curiosity.
>
> Thanks,
> --jim