Many thanks to everyone who replied here and in direct email with
suggestions and even an NEC4 model! I hope you will excuse that I haven't
been able to reply to everyone individually, but your help is really
appreciated.
I am now fairly convinced that the problem ( LF shift) is due to the use of
insulated wire, although this remains to be proved in practice. Yes there
are environmental issues, especially at the low height and unfortunately
these are to a more or less extent inescapable. Where I live, no antennas at
all are allowed, though clearly I have some verticals and wires hiding
amongst the trees! The Moxon has to be erected in a position where the
conservation area cops will not be able to see it, and that implies at not
more than 30ft. That is just the price I have to pay for living in a truly
beautiful spot, but I am still coming to terms! I suppose I just wish that
the published literature had made a caveat about the use of insulated wire;
perhaps I missed it but......
I will post further when the problem is finally resolved.
73
Clive
GW3NJW
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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