[RFI] Fixed my S9 furnace RFI

[Jim Brown]

On 3/22/2014 4:30 PM, ac2ev wrote:
> Well it turns out the simplest solution was the best. I
> Replaced the four wires that went from the controller board to the motor with a single 4-conductor shielded wire.

Thanks for the report, Don. Another simple solution that would have 
worked is to use three twisted pairs, one for each phase. It's easy to 
make twisted pair by cutting two conductors a bit longer than you need 
length, clamping one end of both down to a nail or bench vise, sticking 
the two conductors in a drill, and running the drill a while at low speed.

Few people realize that twisting is as effective as shielding up to 
pretty high frequencies, and far superior to shielding at low 
frequencies (audio).

73, Jim K9YC