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Re: [Amps] 10dB and propagation

To: amps@contesting.com
Subject: Re: [Amps] 10dB and propagation
From: Ian White G3SEK <G3SEK@ifwtech.co.uk>
Reply-to: Ian White G3SEK <g3sek@ifwtech.co.uk>
Date: Sun, 6 Feb 2005 23:30:46 +0000
List-post: <mailto:amps@contesting.com>
Yuri wrote:
You guys might try to poke fun at this. But there are many factors contributing to signal levels received at the other end. Antenna pattern, local ground conditions, terrain and propagation conditions. VHFers know about ducting on VHF between W6 and KH6, you drive up the hill and you can find spot where your signal (few watts) will hit it and you QSO with KH6. You go few hundred feet up or down and you lose it.

Sure, all of that is true... but it all goes strictly dB for dB. There is no support for tropo ducts behaving in a non-linear fashion.

Let's not confuse the variable *importance* of a dB under different circumstances (which is obviously true) with any suggestion that the propagation medium itself is non-linear.

A non-linear medium would have to mean that your signal was directly affecting the ionization density or the refractive index of the troposphere. As I already said, that's wishful thinking at amateur power levels.


-- 73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.co.uk/g3sek _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps

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