[RFI] FCC issues official citation for well pump RFI on Topband

[Jim Brown]

On 4/24/2013 10:27 AM, David Robbins wrote:
>
>
> Apr 24, 2013 01:11:57 PM, jim at audiosystemsgroup.com wrote:
>
>> The single most critical thing that must be done to contain the trash
>> produced by a VFD is to locate both the 3-phase transformer and the
>> motor controller AT THE MOTOR, so that the wiring between these three
>> elements has "zero length."
> that could be REALLY hard if the motor is at the bottom of a well!
>

Yes. BUT -- there's a great solution -- make every current path twisted 
pair, with pairs for the three phases bundled tightly together!  Now the 
field is small because the loop area is small, and radiation is also 
minimized.

73, Jim K9YC