Reg Edwards wrote:
A relay inserted in an antenna wire ...
Been there. Done that! I used a single-contact reed relay.

No arcing problems?
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73, Cecil
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No arcing problem that I ever detected. Transmitter was 100 watts. I
think the relay was rated at 750 volts and it may have been a vacuum
type. Only used on the 160 and 80m bands.

It eventually failed because of intermittent contact on receive when
no wetting current flowed. Perhaps it should have been mercury
wetted.
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Reg.