Re: [Amps] 10 DB increase

["Radioal" <al.dolgosh@hamradio.org>]

A 10 dB increase in power will be propagated as a 10 dB increase - 
regardless of the state of the ionosphere, antennas, locations, etc. 
Instantaneous or rapid cyclical changes in propagation (QSB) can account for 
some A--->B and B--->A (amplifier/barefoot) differences, but repetitive A to 
B changes will average out the differences.  A difference of 10 dB is 
unaffected by other factors, except the cyclical changes noted above, 
inaccurate S-meters or just plain prevarication.

An increasingly common factor in this distortion of fact is the guy who 
tells you he is increasing power from 100 watts to 1000 watts - and you see 
a 15 dB or greater increase.  It becomes obvious that his "very linear" 
tube-with-handles amplifier has somehow broken the 100% efficiency barrier!!

A rose is a rose, and 10 dB is 10dB.

Al - K8EUR
----- Original Message ----- 
From: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>
To: <amps@contesting.com>
Sent: Friday, February 04, 2005 5:27 AM
Subject: Re: [Amps] 10 DB increase


> kenw2dtc wrote:
> > 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
>
> Libertarian non-linear metering, more like  :-)
>
> > or are other factors such as antenna, location of both stations, 
> > propagation etc, the greater of the factors?
>
> Yup.
>
>
> --
> 73 from Ian G3SEK
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