[Elecraft] Balanced AT

[Geoffrey Mackenzie-Kennedy]

Ron AC7AC wrote:


Another issue with a balanced AT is that they tend to be used in multiband
systems fed with open wire line where high SWRs are expected. High SWRs mean
very, very high RF voltages at a current "loop", demanding relays, etc.,
that can safely deal with thousands of volts of RF at any power level much
above QRP.

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A timely warning Ron. This is one reason why commercial remote antenna 
matching units designed to handle such high voltages and / or currents 
without going up in smoke tend to be expensive. Fortunately for those of us 
who homebrewed in ancient times suitable vacuum relays and and Mil Spec wide 
spaced air variable capacitors were available at bargin basement prices.

73,
Geoff
GM4ESD