Topband: RF choke/balun

[David Cutter]

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.

David
G3UNA

----- Original Message ----- 
From: "MR TREVOR DUNNE" <ei2glb at eircom.net>
To: "topband List" <TOPBAND at contesting.com>
Sent: Saturday, September 16, 2017 8:07 AM
Subject: Re: Topband: RF choke/balun


> Hi
>
> Thanks for the replies, no I will be using radials on the ground, amount 
> unknown,
>
> Thanks
> Trevor
> EI2GLB
>
> ----- Original Message -----
> From: "Mike Waters" <mikewate at gmail.com>
> To: "MR TREVOR DUNNE" <ei2glb at eircom.net>
> Cc: "topband List" <TOPBAND at contesting.com>
> 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
> 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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