I think the idea is that silver oxide and silver sulphide are conductors,
while copper oxide isn't. So the coil Q stays up after the atmosphere has been
at work on it.
Wheter or not you can tell the difference at HF is another matter.
For a roller coaster, it should be worthwhile. At an IEE Conference in 1963,
a description of a 80kW output HF tx says that the coil is made of tubing
with air blown through it. The coil is rhodium plated to minimise the effects
of
oxidation, and the roller contact is 90%silver 10%graphite. This kept the
contact temperature down to 30 C even under continuous transmission ( FSK).
A 30kW output tx by another manufacturer is described in the IEE conference
proceedings: that had a plain copper tube tank coil that used swinging arms to
tap on to it, driven by insulating cams.
73
Peter G3RZP
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