[Elecraft] Quiet Ductless HVAC System

[Steve]

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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