Hi Todd,
I'll bet the farm (if I had one) that your air-core choke is ineffective.
Take at look at
http://www.karinya.net/g3txq/chokes to see what I mean.
A very, very good common mode choke is the one I have on mine, from
http://audiosystemsgroup.com/RFI-Ham.pdf. There is no better material
written on this subject, either in print or on the Internet.
73, Mike
www.w0btu.com
On Fri, Dec 28, 2018 at 7:34 PM Todd Goins <tgoins@gmail.com> wrote:
> ... I do have a common mode choke at (near) the feed point. It may or may
> not
> be effective at 160m. It does work on 10-80m. It is about 25' of RG-8 coax
> wrapped around a 4" PVC pipe as a form. Perhaps not ideal... No RF noted in
> the shack.
>
> 73,
> Todd - NR7RR
>
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