[TowerTalk] Resistor Across a Choke Balun

[Jim Brown]

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. k9yc.com/RFI-Ham.pdf includes an extensive tutorial on how ferrite 
chokes work, as well as a lot of other fundamental EMC concepts.

k9yc.com/publish.htm 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