Re: Re: K3: S-meter calibration (redux)

Posted by Brian Lloyd-6 on Jun 07, 2007; 8:30pm
URL: http://elecraft.85.s1.nabble.com/K3-S-meter-calibration-redux-tp448734p448744.html

On Jun 7, 2007, at 12:09 PM, Toby Deinhardt wrote:

> 4. The metering system shall be based on quasi-peak detection with  
> an attack time of 10 msec ∀ 2 msec and a decay time constant of at  
> least 500 msec.

Hmm, peak rather than RMS voltage? If you are averaging then it needs  
to be something like RMS so that noise energy is properly accounted  
for. Peak works for an SSB signal but not so good for general  
measurement. I guess we need to ask Wayne for a peak/RMS switch.

> ------------------------------------------
>
> But *MUCH, MUCH* better is Wayne's plan to display dBm.

Yes.

>
> I do wonder what timing Wayne will use.

And don't forget attack/decay time for the peak-reading meter and  
integration time for the RMS meter function. :-)

Oh dear, this could get SO out-of-hand. Sorry.

73 de Brian, WB6RQN
Brian Lloyd - brian HYPHEN wb6rqn AT lloyd DOT com


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