Thanks David
Ed
AG6CX
Sent from my iPhone
> On Feb 18, 2022, at 4:11 PM, David Eckhardt <davearea51a@gmail.com> wrote:
>
>
> No. Just one core with all three wires passing through. Here is a picture of
> the CMC I had to install on our Kitchen Aid Frig/Freezer:
>
>
> Dave - WØLEV
>
>
>> On Fri, Feb 18, 2022 at 11:41 PM Edward Mccann <edwmccann@yahoo.com> wrote:
>> Dave-
>>
>> Any details or pictures on your three lines of the main CM choke?
>>
>> One choke for each line?
>>
>> A simple multiple wrap of the power cord?
>>
>> Thanks,
>>
>> AG6CX
>>
>>
>> Sent from my iPhone
>>
>> > On Feb 18, 2022, at 3:19 PM, David Eckhardt <davearea51a@gmail.com> wrote:
>> >
>> > An effective common mode choke on the mains conductors should pass all
>> > three conductors through the core. For a 2.4-inch OD core, three turns are
>> > usually good. Too many more will increase the capacitive coupling. 31
>> > material has an advantage at the lower frequencies where the older 43
>> > material is a bit better at higher frequencies. All referring to HF.
>> >
>> > I have "solved" many an emissions problem usually around 40 to 70 MHz from
>> > SMPSs by simply installing a simple common mode choke on the mains lines
>> > (yes, all three lines: hot, neutral, and "ground" - the green wire). Once
>> > these products reach a contract manufacturer, the common mode choke adds
>> > nothing to performance and only adds cost, so it is removed. Many times I
>> > ran into the reality that contract manufacturers are the EMC engineer's
>> > worst enemy. They are supplsed to retest and re-qualify, but they don't.
>> >
>> > Dave - WØLEV
>> >
>> >> On Fri, Feb 18, 2022 at 10:51 PM Jim Brown <jim@audiosystemsgroup.com>
>> >> wrote:
>> >>
>> >> Thanks Ed. What ferrite mix and how many turns?
>> >>
>> >> 73, Jim K9YC
>> >>
>> >>> On 2/18/2022 12:53 PM, Hare, Ed, W1RFI wrote:
>> >>> We just obtained an AC line filter by Morgan Manufacturing. It also used
>> >>> a ferrite on the ground wire.
>> >>
>> >> _______________________________________________
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>> >> RFI@contesting.com
>> >> http://lists.contesting.com/mailman/listinfo/rfi
>> >>
>> >
>> >
>> > --
>> > *Dave - WØLEV*
>> > *Just Let Darwin Work*
>> > _______________________________________________
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>> > RFI@contesting.com
>> > http://lists.contesting.com/mailman/listinfo/rfi
>>
>
>
> --
> Dave - WØLEV
> Just Let Darwin Work
>
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