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9 coil common mode choke for 8 channel comms emitter?

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cupoftea

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Hi,
We have eight low frequency (~1khz) 2-wire comms channels going off a PCB. They all share the same ground.
We wish to do a common mode choke for them. (to stop their wires acting like EMC_fail emitters.)
So we will just wind a 9 coil common mode choke on a torroid.
Is there any foreseeable situation, where doing so could make common mode emissions worse?
 

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