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Re: [TowerTalk] Balun Recommendation

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Balun Recommendation
From: Steve Hunt <steve@karinya.net>
Date: Tue, 17 Apr 2012 11:11:00 +0100
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Jim,

I forgot to mention that Jim Brown's data pretty much confirms my data. 
Take a look at the chart at the bottom of his page 25 here:

http://audiosystemsgroup.com/NCDXACoaxChokesPPT.pdf

You'll see the chart shows Rs>Xs anywhere above about 2.3MHz.

73,
Steve G3TXQ

On 17/04/2012 10:20, Steve Hunt wrote:
> Jim,
>
> I just double-checked my results for the 6 off #31 bead choke. I looked
> carefully at the ratio of the Resistive (loss) component of the choke
> impedance to the Reactive component, across the range 1MHz to 50MHz.
> Between 1MHz and 30MHz it closely tracks the complex permeability charts
> published by FairRite: in other words, below about 4MHz the Inductive
> reactance predominates, but anywhere between from 4MHz to 30MHz the
> Resistive component dominates and by the predicted ratio. Only above
> 40MHz does the choke become predominantly Reactive again, due to the
> stray C involved.
>
>
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