Just as other appliances sold these days with a motor i.e. washing
machines, dishwashers... while digital control may add nice features,
the noise generated can reduce operator pleasure (or operating hours).
Getting any manufacturer to routinely add filtering (even if under $1),
won't happen without a lot of customer noise in return. ;-)
Rick NK7I
On 5/27/2020 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?
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
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