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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