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Re: Topband: RF choke/balun

To: "MR TREVOR DUNNE" <>, "topband List" <>
Subject: Re: Topband: RF choke/balun
From: David Cutter via Topband <>
Reply-to: David Cutter <>
Date: Sat, 16 Sep 2017 09:11:29 +0100
List-post: <>
To get the best performance from your choke, K9YC recommends you make a coil of about 7" diameter from memory. His document has lots of curves to choose the best assembly.


----- Original Message ----- From: "MR TREVOR DUNNE" <>
To: "topband List" <>
Sent: Saturday, September 16, 2017 8:07 AM
Subject: Re: Topband: RF choke/balun


Thanks for the replies, no I will be using radials on the ground, amount unknown,


----- Original Message -----
From: "Mike Waters" <>
Cc: "topband List" <>
Sent: Friday, 15 September, 2017 18:56:59
Subject: Re: Topband: RF choke/balun

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

73, Mike

On Sep 15, 2017 9:24 AM, "MR TREVOR DUNNE" <> 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,

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