[Elecraft] Quiet Ductless HVAC System

[Dave Cole]

Of late, the fans in these systems are speed controlled by PWM.  Nice 
high power square waves...

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 5/27/20 10:08 AM, Phil Hystad wrote:
> I didn’t know that an HVAC system would be an RFI generator.  What part of HVAC is the cause of this and is this a recent problem in manufacturing units?
> 
> Note — I have never lived in a home with AC — never had a need here in the northwest (Seattle area).  I probably should add that when we go to our condo on Kauai the first thing my wife does is to turn off the AC unit.
> 
> 73, phil, K7PEH
>