Topband: Inverted L improvement question - Part 2

[Todd Goins]

Hi Mike,

Oh, I would totally believe that the air-wound choke is ineffective at
160m. It just happens to be what I had available to use when I rigged up
the elevated radials in the cold rain yesterday. I figured I'd put it in
line just in case.

Thanks for the choke links, I will read the info on those sites.

The air-wound choke is what I'm using when I'm feeding the antenna using
the elevated radials. When I was testing using my buried radial field it is
a different setup. There I have a DX Engineering radial plate that neatly
ties everything (remote tuner, and DX Engineering Maxi-core Feedline
Current Choke) together at the feed point.

Thanks for the comments and info.
73,
Todd - NR7RR


On Fri, Dec 28, 2018 at 5:57 PM Mike Waters <mikewate at gmail.com> wrote:

> 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 at 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
>>
>