You must remember that the parts that go in much of this equipment is
supplied by the lowest bidder. If a component can be left out even if
its only a few pennies it will be left out. I was in the service
business and owned a business for over 25 years doing installations. I
was never asked about RF noise by a customer. Ever. I did however ask
factory reps questions and most looked at me with deer in the headlight
faces. I have been out of the business for ten years and suspect that
the situation has not improved and perhaps gotten much worse.
Realistically when you see the number of active hams who buy AC products
vs the number sold you will realize it a very uphill battle. Very noisy
led bulbs have been sold for how long? They are a known source too.
It was a conscious decision to ignore this by the government because it
fit in with the energy saving mandates. Its a case of the squeaky wheel
getting greased. When price is the major factor quality always suffer.
You can't have both.
I don't like it either. I'm in the middle of fighting with a trio of
noisy inverters where I live. The RF noise is so bad it kills 2 meters
and UHF. Background noise is S9 all the time. Even at night. Unless its
dark and I kill the feed to the panels. The installer is no help and I
don't own the building. FCC said call the manufacturer. Great. My KX3
allows a respite by going out into the field. Steve kb1chu
On 5/27/2020 6:09 PM, Clay Autery wrote:
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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