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Re: [TowerTalk] Fair rite materials for choke baluns

To: Reflector -tower <towertalk@contesting.com>
Subject: Re: [TowerTalk] Fair rite materials for choke baluns
From: Steve Hunt <steve@karinya.net>
Date: Sun, 3 Jul 2016 18:05:40 +0100
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Rudy,

The #52 mix is readily available in size "240" toroids and makes a useful choke for the higher HF bands. Take a look at the performance of 11 turns on two stacked FT240-52 cores; it's the eleventh line on this chart:
http://www.karinya.net/g3txq/chokes/

And here's the detail:
http://www.karinya.net/g3txq/temp/52_mix.png

It achieves Rs>5000 Ohms from 10Mhz thru 28MHz, and Rs>8000 Ohms from 12MHz thru 21MHz.

Steve G3TXQ


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