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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