[Elecraft] Quiet Ductless HVAC System

[Lynn W. Taylor, WB6UUT]

The compressor as well.  They aren't necessarily running at 60 Hz (or 50 
Hz for those across the pond).

73 -- Lynn

On 5/27/20 10:17 AM, Dave Cole wrote:
> 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?