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That's a good start then Roger, !
I think it could be visualised as a
gradual / gradient , so the top wires have
the max current in free space and the
return path is some form of diffused large
cross sectional area , you could
model it on 2 meters ..using what for
the ground ... cardboard box , bin bag , water and jar of
cooking salt , add to increase conduction ?
Could be simply gain is from the increased
amps in the top radiator , so the model
would be quite small for 2 mtrs , kitchen
table job !
.G..
Sent: Sunday, January 06, 2013 5:53 PM
Subject: Re: LF: 472kHz TX without an antenna: it gets better (701km
with around 5mW ERP)
Well this is just about the only explanation that will make any sense
Graham.
If so, I would expect some directivity and when I analyse the
results after an overnight run we'll see if stations off the side of the "loop"
are statistically weaker (compared with the Marconi vertical) than stations in
the line of the "loop". If so, this would tend to support loop like operation.
The DL-SWL and PA reports are roughly in the plane of the wire, but there are
plenty of reports from other directions too.
Of course, here in the
UK we have highly saturated ground - I have NEVER known East Anglia to be so
waterlogged - so the effective loop area cannot be that
great. Anyone care to offer other suggested modes for this "non
antenna"? 73s Roger G3XBM
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