RX - Common-mode current choke for coax and controller cable

Difference between revisions from 2021/03/20 00:19 and 2021/03/20 00:17.
[<-- Back to Index|Main page] | [<-- Web page|https://remoteqth.com/commonmode-ctrl.php]
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rev. 1.0 11/2020 by Jan OK2ZAW
''' There are two version: K9AY++ and universal '''
[https://remoteqth.com/img/ZAW-WIKI/k9ay-bpf/controller_k9ayplus_gnd_850.png|noborder]* Example for K9AY++
[https://remoteqth.com/img/ZAW-WIKI/cmcc/crtl_cable/k9ay_ctrl_cmcc_ctrl_850.jpg|noborder]

!Noise Suppression by Common Mode Choke Coils
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).

Great article from [Chuck Counselman, W1HIS|https://remoteqth.com/img/ZAW-WIKI/cmcc/CommonModeChokesW1HIS.pdf]
How Common Mode Chokes Work by [W├╝rth Elektronik|https://www.we-online.com/web/en/passive_components_custom_magnetics/blog_pbcm/blog_detail_electronics_in_action_61439.php]

!Example  
[https://remoteqth.com/img/ZAW-WIKI/cmcc/dk8ok_MW999_850.png|noborder]

!Common-mode current isolation for coax
- for 50 Ohm RG-316 coax cable 10 turns
* [bigger pic 1 to 50 MHz|https://remoteqth.com/img/ZAW-WIKI/cmcc/5+5.png]
* [bigger pic 0,1 to 2,5 MHz|https://remoteqth.com/img/ZAW-WIKI/cmcc/0,1to2,5.png]

[https://remoteqth.com/img/ZAW-WIKI/cmcc/5+5-850.png|noborder]
[https://remoteqth.com/img/ZAW-WIKI/cmcc/850-0,1to2,5.png|noborder]

!Insert LOSS of Common-mode current choke (CMCC)
- for 50 Ohm RG-316 coax cable 10 turns
* [bigger pic|https://remoteqth.com/img/ZAW-WIKI/cmcc/IL.png]

[https://remoteqth.com/img/ZAW-WIKI/cmcc/IL-850.png|noborder]



!Common-mode current isolation for controller cable
- on small core inductors
 [bigger pic 0,5 to 50 MHz|https://remoteqth.com/img/ZAW-WIKI/cmcc/crtl_cable/ctrl_0,5-50.png]
 [https://remoteqth.com/img/ZAW-WIKI/cmcc/crtl_cable/ctrl_0,5-50_850.png]
 [bigger pic 0,1 to 2,5 MHz|https://remoteqth.com/img/ZAW-WIKI/cmcc/crtl_cable/ctrl_0,1-2,5.png]
 [https://remoteqth.com/img/ZAW-WIKI/cmcc/crtl_cable/ctrl_0,1-2,5_850.png]



!KIT

!! Schematic and board
[bigger - CMCC+CTRL universal|https://remoteqth.com/img/ZAW-WIKI/cmcc/crtl_cable/cmcc_uni_ver01.jpg]
 [https://remoteqth.com/img/ZAW-WIKI/cmcc/crtl_cable/cmcc_uni_ver01_850.jpg]

 [https://remoteqth.com/img/ZAW-WIKI/cmcc/crtl_cable/brd_v1.0_universal.png]

[bigger - CMCC+CTRL for K9AY++|https://remoteqth.com/img/ZAW-WIKI/cmcc/crtl_cable/cmcc_k9ay_ver01.jpg]
 [https://remoteqth.com/img/ZAW-WIKI/cmcc/crtl_cable/cmcc_k9ay_ver01_850.jpg]

 [https://remoteqth.com/img/ZAW-WIKI/cmcc/crtl_cable/brd_v1.0_k9.png]




!! KIT assembling

*SO-239 connector
[https://remoteqth.com/img/ZAW-WIKI/cmcc/crtl_cable/cmcc_ctrl_kit_k9_pl_box_850.jpg|noborder]
* F connector
[https://remoteqth.com/img/ZAW-WIKI/cmcc/crtl_cable/cmcc_ctrl_kit_k9_f_box_850.jpg|noborder]

*SO-239 connector
[https://remoteqth.com/img/ZAW-WIKI/cmcc/crtl_cable/cmcc_ctrl_kit_uni_pl_box_850.jpg|noborder]
* F connector
[https://remoteqth.com/img/ZAW-WIKI/cmcc/crtl_cable/cmcc_ctrl_kit_uni_f_box_850.jpg|noborder]

!Drilling
[https://remoteqth.com/img/ZAW-WIKI/cmcc/1-2_2_850.jpg|noborder]
[https://remoteqth.com/img/ZAW-WIKI/cmcc/1-3_2_850.jpg|noborder]



[https://remoteqth.com/img/ZAW-WIKI/cmcc/1f_2_850.jpg|noborder]
[https://remoteqth.com/img/ZAW-WIKI/cmcc/1f1_2_850.jpg|noborder]

!!Common mode current choke
* Common mode current choke construction
* Wind 5 to 5 turns on one side than cross to another side of cores and wind rest turns.

[https://remoteqth.com/img/ZAW-WIKI/4-way/5.jpg|noborder]
[https://remoteqth.com/img/ZAW-WIKI/4-way/6.jpg|noborder]
[https://remoteqth.com/img/ZAW-WIKI/4-way/7.jpg|noborder]