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Re: [TowerTalk] ferrites for Beverage transformers

To: towertalk@contesting.com
Subject: Re: [TowerTalk] ferrites for Beverage transformers
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Wed, 12 Apr 2017 15:24:24 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
I disagree, Rick, at least in part. The resistive component does NOT contribute to transformer action. I do agree that loss is not a terrible thing in RX applications, but it isn't a good thing either.

73, Jim

On Wed,4/12/2017 10:58 AM, Richard (Rick) Karlquist wrote:


On 4/12/2017 10:10 AM, Jim Brown wrote:

wind inductive components (transformers) for 2-4 MHz.

Sorry, but I don't consider "inductive" components to
include broadband transformers at receiving power levels.
Beverage transformers fall into this category.
In these cases, the only thing that matters is the magnitude
of the impedance per turn.  It doesn't matter if this
impedance is entirely resistive.



http://www.fair-rite.com/files1/Fair-Rite_Catalog_17th_Edition.pdf
Material specs begin on page 10. Page 30 describes #73 material. A quick
study of the first graph of complex permeability vs frequency shows that
it is a poor choice as an inductive component above 1 MHz. Why it has
become popular for Beverage transformers is a mystery to me. The only

73, Jim K9YC


No, #73 is popular for Beverages because you get considerably more impedance per turn than, say #43 material.

73
Rick N6RK
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