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Re: [TowerTalk] Resistor Across a Choke Balun

Subject: Re: [TowerTalk] Resistor Across a Choke Balun
From: Jim Brown <>
Date: Thu, 30 Jun 2022 15:34:04 -0700
List-post: <>
On 6/30/2022 2:57 PM, KD7JYK DM09 wrote:
I've looked on and off over the years for a tutorial, but not had any luck, can anyone suggest a route of study for me?

Yes. includes an extensive tutorial on how ferrite chokes work, as well as a lot of other fundamental EMC concepts. includes two choke "Cookbooks," one for MF/HF, another VHF/UHF. The MF/HF cookbook is based on more than a year of winding and measuring more than a thousand chokes; the VHF/UHF cookbook is based on Fair-Rite data sheets for specific cores. This material has been in the ARRL Handbook for a while.

There's also an applications note on identifying RF noise by type and providing advice on how to locate and kill it. It includes winding guidelines for clamp-ons at the source of noise.

73, Jim K9YC


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