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On Tue, 13 Feb 2018 07:41:49 +0200, Vic wrote:
>
>I have always thought those ‘safety’ chokes aren’t worth much. The 2.5 mh
>chokes often used in that spot are rated at 300 or even 125 ma, and I suspect
>they would open long before the plate supply fuses would blow.
>But note that the capacitors Martin mentioned are only rated at 500v, so they
>aren’t much of a safety feature either!
>
>Vic 4X6GP
REPLY:
That's a good point. Perhaps the best measure would be a custom choke
wound with heavy wire (18 gage or heavier) wound on a ferrite core. It
would have to be carefully checked for resonances in the ham bands.
If your antenna has DC continuity, that itself is protection, but
antennas such as simple dipoles do not.
Whichever approach you prefer, please do something. You REALLY don't
want HV on the antenna!
73, Bill W6WRT
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