[RFI] Please comment this picture

[Dave (NK7Z)]

Hi Martin,

I would not use snap-ons, or slip-ons.  I would use FT-240-31 cores from 
Fair-Rite.  The cores with wraps on them work far better than the snap 
on chokes.

Look here:

http://audiosystemsgroup.com/K9YC/K9YC-old.htm

for everything you need to know about use of ferrite material for CMC 
choking.

Place a choke at the feedpoint of every antenna if possible, or as close 
as possible to the feedpoint.

Jim's CMC material is the gold standard for this sort of thing.  If you 
have only time to read one paper make it this one:

http://k9yc.com/2018Cookbook.pdf


73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 1/3/23 11:03, Martin Kratoska wrote:
> The attached picture displays my proposed CM choking scheme around the 
> antenna switch. Take a look at this and comment, please - what is 
> insufficient, what is an overkill etc.
> 
> The pic is also here:
> 
> https://ok1rr.com/public/choking.png
> 
> 73,
> Martin, OK1RR
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