Excellent explanation Gary. And it's good ammo for my recommended
tongue-in-cheek method of signal reporting:</div><div
" Ur easy cpi" or " Sri ur not exactly ragchew quality"
Contesting, of course, is a different story. The
obligatory 5NN makes a nice sync character
to get my brain ready for the rest of the exchange.
Later, Joe, K8MP
Sent from AOL Mobile Mail
From: Gary Follett <firstname.lastname@example.org>
To: Discussion of Ten-Tec Equipment <email@example.com>
Sent: Wed, May 11, 2016 04:07 PM
Subject: Re: [TenTec] O2- S-meter adjust.
The S meter operates from a single D to A converter, shared with S meter
function and output power function. It's adjustment therefore sets both reading
If your meter is reading 100 watts in transmit, in CW, into a 50 Ohm load, then
the adjustment is set properly and there is no other separate S meter
calibration you can do.
This is not, IMHO, a very desirable S meter arrangement but it is what it is. S
meters have never been all that quantitative anyway, except in some commercial
applications (such as in selective level meters) so I would not be too
Sent from my iPad
> On May 11, 2016, at 10:55 AM, <a href="mailto:firstname.lastname@example.org"
> target="_blank">email@example.com</a> wrote:
> I seek an understanding of the difference in counts for the default settings
> of the S-meter. I’m rather new in this forum, maybe it has been explained
> long ago. If so I would like a reference.
> Normally the difference between S-units should be 6 dB, and I’m sure TT has
> tried to be precise.The counts are not far off, but the count intervals vary
> rather much. However, there must be a reason for the uneven intervals in
> counts. An oldfashioned AGC could easily be much more linear in S-meter
> reading, so I wonder if it is caused by conflicting or anticipated
> operational settings involving the DSP action? NR, AGC decay speed, hang
> time, RF Gain?
> I was triggered by a signal on 40 m CW reading close to S+60 by a station
> which couldn’t possibly (>500 km away) generate a 50 mV signal at the antenna
> If I had a calibrated RF generator I would of course have calibrated the
> S-meter. But I don’t. Has anybody tried to check the default settings?
> 73, OZ6NF, Gunner
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