Hi Andy,
Isn't it, the ERP is I^2*Rrad*1,83, if we assume a vertical antenna?
73, Stefan
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Von: [email protected] im Auftrag von Andy Talbot
Gesendet: Do 21.01.2010 20:27
An: [email protected]
Betreff: Re: LF: Re: M0BMU - any chance of some new ERP estimates please?
So go on: argue against the Rrad (an exact figure derived from basic
electromag theory) and Rloss (easily measurable, called Ohms law) way of
getting antenna efficiency.
Or ERP = I^2 . Rrad where I is measurable.
Only uncertainty in any of these techniques is the effective height of the
antenna used to get Rrad, but absolute worst case, can only ever lead to 6dB
error. The difference between no top hat and an infinite top hat
Andy
www.g4jnt.com <http://www.g4jnt.com/>
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