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Re: LF: Re: VLF Earth Mode does NOT need an NoV - official at last

To: [email protected]
Subject: Re: LF: Re: VLF Earth Mode does NOT need an NoV - official at last
From: Stefan Schäfer <[email protected]>
Date: Wed, 19 Jan 2011 18:08:31 +0100
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Hi Roger,

Am 19.01.2011 16:24, schrieb Roger Lapthorn:

The 18.1.11 OFCOM email does appear to give a tacit go-ahead for anyone to experiment with essentially non-radiating earth mode conduction without real restriction on a non-interference basis. To my knowledge, this is the very first time anyone at a UK government telecoms authority (Post Office, MPT and now OFCOM) has ever made this statement.

It may be semantics, but I believe this is an important statement.

Well, english is not my mother language but for me it sounds the same. It is clear that even a loop with 10 cm diameter radiates some power at a given TX power. Maybe its 1 yW (1E-24 W) :-) but this seems to be OK for OFCOM. So, if they say the limit is not to disturb commercial stations, you may run several MW into your earth antenna or loop above the ground. The limit would be the antenna wire voltage.

Maybe you can arrange a field day or rather a sea day in UK, where all the VLF enthusiasts come to the beach and rise a kite (each one) to build up an inv-L antenna, 60m up and 500m long! :-) Or Mal could use his inv-L with additional balloon antennas mounted on the vertical sections, 60m up, 5m spaced, so 90 balloon antennas if i remember his antenna correctly :-)

73, Stefan
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