The way the picture shows you have connected the CMC, you are not measuring
CM rejection but rather DM which should be low. You need to tie both ends
of the choke together and feed CM and sense CM. Jumper the 'common' or
coax shield around the setup. Both ends going to CH 00 and CH 01 are tied
together and then go to the coax center conductor on each end. That way
you are exciting CM and sensing CM.
Dave - W ?LEV
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On Sat, Jan 2, 2021 at 1:01 AM Don - KM4UDX <dontay155@...> wrote:
Sirs, you have thrown down the gauntlet, Sir, and I accept your challenge.
In my previous life, I was a more than adequate spreadsheet wiz. So I
should be able to handle this job. haha. First, the object. Build and
validate a CMC based on this published and evidently respected source.
Specifically the 11 turn on 2.4 #61. I think I know how to wind wire around
a core and count to 11. So that is one. Picture attached. Now I want to
validate that the CMC delivers (about? sort of?) the same Rs as k9yc
published in his NM/THHN #12 on single 2.4 #31 Toroid table.
Using my beloved nano, I built a test jig (please don't laugh too
hard...), tried to calibrate over 1-30, and saved the required s2p file.
Then imported that file into ZPLOTS from AC6LA. The spreadsheet loads fine,
and the initial plots appear fine. But. When I click "generate data" to get
the resistance terms, well, it all goes to zeros. So I'm screwing something
up here. I've attached the populated spreadsheet and the raw nanosaver
output fine.
can anyone give me the slap in the face I need and set me straight...?
Thank you all soooo much.
Signed, a pitiful liberal arts major in Virginia.
km4udx
--
*Dave - W?LEV*
*Just Let Darwin Work*
