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Re: [TowerTalk] Balun Recommendation

Subject: Re: [TowerTalk] Balun Recommendation
From: Steve Hunt <>
Date: Sun, 15 Apr 2012 10:08:15 +0100
List-post: <">>

I doubt it's material with as low a permeability as #61 or #67. If you 
look at the photos of the UnUn, you'll see it comprises 6 turns of coax 
on a core that is significantly smaller diameter than a size 240 
(probably a 140); that could never give the required winding impedances 
needed at the bottom end of the HF range for a 12.5/50 transformer. My 
guess is that it's #52 which I know this manufacturer uses widely - that 
would give him the required winding impedances with 6 turns.

Steve G3TXQ

On 15/04/2012 01:08, Jim Brown wrote:
> Right.  Sorry, I slept through the details of your post. It's clearly
> acting as a classic magnetically coupled transformer, so  yes, I'd say
> it was a very good test, and that it  demonstrates very high
> efficiency.  From that, I'd guess it to be a material like Fair-Rite #61
> or #67.

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