[hpsdr] S meter bug

[Roland ETIENNE]

Hi Scott,

 

Yes, you’re right, strictly S0 is -147 dBm. At the time I thought of this
possibility to display S point instead of dBm, (this is my small
contribution to OpenPowerSDR
), I had two choices:

Exemple in VHF:

1)       S1 could be displayed for signals >= -141 dBm and < -135 dBm
(strict value and above)

2)       S1 could be displayed for signals > -144 dBm and <= -138 dBm
(strict value is in the middle of the range)

I made choice 2, that’s the reason for the 3dB you mentioned. Of course,
this can be changed, I don’t know what is the best?

 

73,

Roland F8CHK

 

  _____  

De : Scott Traurig [mailto:scott.traurig at gmail.com] 
Envoyé : lundi 21 mai 2018 17:17
À : Roland ETIENNE
Cc : Helmut Oeller; hpsdr; Doug W5WC
Objet : Re: [hpsdr] S meter bug

 

My apologies, Roland, I should have looked at what you wrote more carefully.
It was my poor English as a First language, not your poor English as a
second language! :-)

 

This is indeed a problem. And it exists in Thetis, also.

 

There does appear to be a 3dB error as well. Should the code not read:

 

 if (num <= -147.0f) output = "    S0); 

 

???

 

73!

 

Scott/w-u-2-o

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