Message-ID: <26757.200001181708@gemini>
From: "James Moritz" <j.r.moritz@herts.ac.uk>
Organization: University of Hertfordshire
To: rsgb_lf_group@blacksheep.org
Date: Tue, 18 Jan 2000 17:08:34 +0000
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Subject: LF: Grounds/ERP
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Dear LF Group,
	Was very interested to read G3LDO's piece about antenna 
comparisons - it seems that the most important factor for DX 
operation on 136kHz may ultimately be the ground, rather than the 
antenna. People seem to be of the opinion that the M0BMU signal 
is quite good considering my small antenna - the ground here is 
heavy clay, which stays very wet just below the surface even in 
summer, which might be a factor in my favour. As G3XDV pointed 
out some time ago, it is also within a couple of hundred metres of 
the edge of the Brookmans Park MF broadcast site, and may 
benefit from their ground system.

Can anybody enlighten me as to the exact defenition of ERP  - 
calculation of the radiated power from antenna current and 
geometry is one thing, but is it the same as ERP in the amateur LF 
allocation licence conditions?

Cheers, Jim Moritz
73 de M0BMU