Re: [Amps] 10 DB increase

[GGLL <nagato@arnet.com.ar>]

	Ken, IMHO it's non linear (a simpler, bad design) or unadjusted metering 
system. In older receivers with S-meters calibrated in microvolts, a 10 dB 
power increase reflects as a 20 Db input change.
	Concerning S-meter systems, the best I have seen were mainly Kenwood's with 
needle instruments (TS 430, 440) and  a few Icoms (three adjustment pots!, and 
you see the result). In those Kenwoods, during the adjustment process you also 
tweak for "mis-alignment" one of the IF-unit's tuned can. I guess this way 
they achieve the accurate readings.
	I also believe that what's in the "middle" of both antennas should affect 
equally both signal power levels, don't they? (a linear propagation media).
	But as said in another e-mail in the case of fast changing condx, several 
tests should average readings.

Best regards
Guillermo - LU8EYW.

kenw2dtc escribió:
> "Many years ago, an old timer (W6SDM) told me that to make a noticable
> difference on HF SSB, it took +10db."
>
> While on the subject of DB.  Many times when someone adds 10db to the 
> transmit side, in an A/B test, almost no one on the receiver side shows 
> a 10 db 'S' meter increase, many times the receiver readings show a 20 
> or 25 db increase.  Is the major reason due to liberal non-linear 
> metering or are other factors such as antenna, location of both 
> stations, propagation etc, the greater of the factors?
>
> 73,
> Ken W2DTC
>
>
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