The easy alternative is just to use a dual speed pump. The energy
savings is not quite as ideal as the variable type, but being a
conventional motor, they produce ZERO RFI.
73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com
On 6/25/20 11:32 PM, Jim McCook wrote:
Hi Jim,
The installer told me he will be sure the manufacturer has a solution
or he will remove it and install a AC motor or whatever it takes to
stop the noise. I'm going to leave the entire project up to the owner
and installer. They know about FCC Part 15. It seems that DC motors
are showing up everywhere. My neighbor had to remove several DC motor
ceiling fans. I offered to visit the fan store with him to pick a
clean model. Most all were DC fans and we only found a couple that
did not generate RFI. The store took the previous fans back and
installed the new ones. My biggest help with neighbors has been a
copy of the WSJ RFI article From March 12, 2014. If anyone wants a MS
Word version I can Email it. Jim W6YA
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