As I understand it.... ANY part of the HVAC system that uses a motor or
reciprocating drive mechanism that runs off AC current. Anything that
runs off DC current that is sourced from AC current via a switch mode
power supply, any part of the system that has an ECM, et al. electronic
"futzing" device that might produce an oscillating signal.
MOSTLY the air handling unit usually, and specifically the variable
frequency drives, electronic control modules, et al.... whatever they
are called.... NOT properly filtered, wired, suppressed, then they can
be a source of RFI.
______________________
Clay Autery, KY5G
(318) 518-1389
On 05/27/20 12:08, Phil Hystad via Elecraft 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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