RE: Re: K3 S-Meter and 6dB
Posted by
Darwin, Keith on
May 17, 2007; 2:20pm
URL: http://elecraft.85.s1.nabble.com/K3-IF-AF-Dsp-questions-comparisons-tp447571p447591.html
I agree that 5 dB per S-unit makes good engineering sense. Sorry to the
standards group, but 6 db per s-unit just doesn't add up. Having the
S-meter at S-1.5 with the antenna disconnected? Can we say useless?
With modern rigs, it would be a fairly simple matter for the
manufacturer to use the DSP to correct the s-meter. AGC may not be
linear but the DSP could compensate and provide a corrected drive for
the meter that would provide S-0 with no signal, S-9 at 50 uV and a
pretty even 5 db per s-unit between there.
If that were done and if the user knew it was 5 per unit, then we'd be
able to actually start using the s-meters to indicate something more
than just "you have signal".
S-meters are only useless because they've been built that way for too
many years.
- Keith N1AS -
- SKCC 344c -
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