[TenTec] O2- S-meter adjust.

[Gary Follett]

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 spans.

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 concerned.

Gary W0DVN

Sent from my iPad

> On May 11, 2016, at 10:55 AM, gunnerjuulnyholm at me.com wrote:
> 
> Hi,
> 
> 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 plug.
> 
> 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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