[RFI] Solar panel RFI

Edward Mccann edwmccann at yahoo.com
Fri Feb 18 19:20:04 EST 2022


Thanks David
Ed
AG6CX

Sent from my iPhone

> On Feb 18, 2022, at 4:11 PM, David Eckhardt <davearea51a at 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 at 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 at 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 at 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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>> >> 
>> > 
>> > 
>> > -- 
>> > *Dave - WØLEV*
>> > *Just Let Darwin Work*
>> > _______________________________________________
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>> > RFI at contesting.com
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>> 
> 
> 
> -- 
> Dave - WØLEV
> Just Let Darwin Work
> 


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