Topband: RF choke/balun

[Mike Waters]

If you're going with elevated radials, then a feedline choke is a must.
Place it within a few feet of the feedpoint.

Use four or five stacked 2.4" diameter #31 ferrite toroid cores with about
six turns of coax wound through them.  See K9YC's excellent reference to be
sure.

73, Mike
www.w0btu.com

On Sep 15, 2017 9:24 AM, "MR TREVOR DUNNE" <ei2glb at eircom.net> wrote:

> Hi All
>
> I am planning on making an RD Choke for my 160m inverted L and was
> wondering what others use,
>
> I was thinking of 3 stacked ft240-43 cores and maybe 10-12 turns of some
> rg316 or the like small coax,
>
> With 61 or 31 be a better material to use and do I need more or less turns,
>
> I'm loosely working from the G3TXQ website where he did like of
> measurements on different chokes, but not we're great on 160m,
>
> I'd like to end up with something like a balun design 1116d but with a lot
> less money in it,
>
> Thanks
> Trevor
> EI2GLB
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