[RFI] Blower noise from Carrier Furnace
Jim Brown
jim at audiosystemsgroup.com
Wed Jan 27 15:27:01 EST 2016
On Wed,1/27/2016 11:54 AM, Jim Netwal via RFI wrote:
> Does anyone have any advice or a fix for this?
Call the vendor. Many have optional line filters. Variable speed drives
are inherently noisy -- they start with a Switch Mode Power Supply, and
then they pulse-width modulate what's left to control the motor. The
vast majority are unfiltered, and wiring is spread out so that they
generate strong magnetic fields by virtue of their large loop area. This
combines to make them terrible noise sources.
73, Jim K9YC
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