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Common-mode current choke for coax & controller cable K9AY++ manual

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Noise suppression by CMCC
Example
CMCC isolation
Insert LOSS of CMCC
Schematic
PCB
KIT Assembling
Part list
CMCC construction
Article


Noise suppression by CMCC

Common-mode current choke (CMCC) coils work as a simple wire against differential mode current (signal), while they work as an inductor against common mode current (noise).

effect of common-mode current choke cmcc by qro.cz hamparts.shop



example of configuration with K9AY++

example of configuration common-mode current choke controller with k9ay++ by qro.cz hamparts.shop



version with PL SO-239 connector

assembled common-mode current choke cmcc controller cable by  pl so-239 qro.cz hamparts.shop



version with F connector

assembled common-mode current choke cmcc controller cable by qro.cz hamparts.shop


Example - measure by Nils DK8OK

common-mode current choke cmcc qro.cz hamparts.shop




CMCC isolation

- for 50 Ohm RG-316 coax cable 10 turns

0.5 to 50 MHz

measurement common-mode current choke cmcc qro.cz hamparts.shop

0.1 to 2.5 MHz

measurement common-mode current choke cmcc qro.cz hamparts.shop

- for controller cable on small core inductors

0.5 to 50 MHz

measurement common-mode current choke cmcc qro.cz hamparts.shop

0.1 to 2.5 MHz

measurement common-mode current choke cmcc qro.cz hamparts.shop


Insert LOSS of CMCC

- for 50 Ohm RG-316 coax cable 10 turns



common-mode current choke cmcc qro.cz hamparts.shop

Schematic

schematic common-mode current choke cmcc controller cable by qro.cz hamparts.shop

PCB

pcb common-mode current choke cmcc controller cable by qro.cz hamparts.shop

KIT Assembling

version with PL SO-239 connector

common-mode current choke cmcc controller cable by qro.cz hamparts.shop



version with F connector

common-mode current choke cmcc controller k9ay by qro.cz hamparts.shop

pcb after assembling all the parts

common mode current choke cmcc controller k9ay by qro.cz hamparts.shop


Part list

NAMEPARTVALUE
C1 - C3 capacitor 100uF 500V
C4 - C8 capacitor 100uF 500V
X1, X2 RJ45 RJ45 PCB
CMCC1 - CMCC8 inductor 5mH
core qro.cz CMCC core
CON connector PL S0-239 or F



CMCC construction

- common-mode current choke construction
- wind 5 to 5 turns on one side then cross to another side of the cores and wind rest turns.

common-mode current choke cmcc qro.cz hamparts.shop



common-mode current choke cmcc qro.cz hamparts.shop



common-mode current choke cmcc qro.cz hamparts.shop




Article

   Read article from Chuck Counselman, W1HIS and article How Common-mode chokes work by Würth Elektronik.




Related articles
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Common mode choke coils work as a simple wire against differential mode current (signal), while they work as an inductor against common mode current (noise).
Common mode choke coils work as a simple wire against differential mode current (signal), while they work as an inductor against common mode current (noise).
Common mode choke coils work as a simple wire against differential mode current (signal), while they work as an inductor against common mode current (noise).
Common mode choke coils work as a simple wire against differential mode current (signal), while they work as an inductor against common mode current (noise).
Common mode choke coils work as a simple wire against differential mode current (signal), while they work as an inductor against common mode current (noise).
Common mode choke coils work as a simple wire against differential mode current (signal), while they work as an inductor against common mode current (noise).
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