Re: Revised version of the HF Antenna isolator

Chris Moulding

Hi Paul,

It depends how you use it.

If you are using conventional radials or counterpoises for your antenna then an earth rod at a lightning arrestor on the antenna side will be OK.

The additional gas discharge tube and 1 M ohm resistor on the new version of the HF Antenna Isolator is intended for use with counterpoises isolated from ground. I wrote an article for the RSGB RadCom magazine showing how to reduce RF noise from local sources using a vertical antenna with isolated counterpoises.



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