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Re. the ongoing discussion about radials etc. I
once saw a 500 Khz installation which used a marconi "T" ant. with 3
top wires.Below was a counterpoise earth system which consisted of about 10
spaced wires equal in length to the top wires.these wires were about 10 feet
above ground and were linked together.I suppose you could best call this system
a " GROUND SCREEN " Obviously if the ant return current can be made to
flow through this screen then ground losses will be reduced.I guess we could
learn a lot from these 500Khz installations,but where is the information? I
would especially like details of the tuning system,since to be effective the
whole thing must be resonant.L.A.Moxon gives details of multiple short radials
in his book "H.F.Antennas for all occasions" so we do at least have
some information on this part of the system. 73 Laurie
G3AQC.
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