[Amps] 10 DB increase

[R.Measures]

On Feb 5, 2005, at 6:51 AM, k7fm wrote:

> My opinion on S meter readings is that the manufacturers may 
> intentionally
> distort the readings to sell product.  They are conscious that often 
> the
> buyer will compare two radios and the one with the highest s meter 
> reading
> on a weak signal is the one purchased.  It would be easy to design an s
> meter on a $3,000 dollar radio to be accurate - if the manufacturer 
> wanted
> to.
>
> At one time, there was an unaccepted standard of 50 uv for S9 and 6 db 
> per s
> unit.  I recall the early Collins receivers came out pretty close on 20
> meters.  On the other hand, my late model Icom might go 3 s units for 
> 6 db.
>
> It would be easy to get it right - if the ARRL lab started rating s 
> meter
> accuracy.  But, they seem to consider it not a big deal, so it never 
> will
> be.

After George Grammar left QST,things changed and the advertisers became 
more important than QST subscribers.  When an advertised in QST,  
manufactured, "3kW" tuner caught fire at 900W in the ARRL Lab, it was 
not reported in QST.  When the ARRL Lab technician noted that a 
3cx1200A7 amplifier made by the same manufacturer exhibited signs of 
parasitic arcing during testing in the Lab, the problem was not 
reported in the QST Product Review.
>
> If it is important, you can take a signal generator and make your own
> calibration table - similar to the calibration curve of the old HRO.  
> Colin
> K7FM
>
>
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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org