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Quiet Ductless HVAC System

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Jim Brown-10

Re: Quiet Ductless HVAC System

On 5/27/2020 3:09 PM, Clay Autery wrote:
> ANY part of the HVAC system that uses a motor or reciprocating drive
> mechanism that runs off AC current.

Not quite. The culprit is most often variable speed controllers for ANY
motor. Systems without such "go fasters" are far less likely to be noisy.

73, Jim K9YC
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Clay Autery-2

Re: Quiet Ductless HVAC System

You are correct, as usual. <smile> My intent in citing motors, et al.
was that MOST of these devices, especially these days, are
monitored/controlled by potentially offending devices.

______________________
Clay Autery, KY5G
(318) 518-1389

On 05/27/20 17:29, Jim Brown wrote:

> On 5/27/2020 3:09 PM, Clay Autery wrote:
>> ANY part of the HVAC system that uses a motor or reciprocating drive
>> mechanism that runs off AC current.
>
> Not quite. The culprit is most often variable speed controllers for
> ANY motor. Systems without such "go fasters" are far less likely to be
> noisy.
>
> 73, Jim K9YC
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Elecraft mailing list

Re: Quiet Ductless HVAC System

In reply to this post by Clay Autery-2

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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Bob McGraw - K4TAX

Re: Quiet Ductless HVAC System

And one must remember that most folks will spend the least amount of
money necessary to get the HVAC system working or perhaps install a new
system. And most of these folks have no clue about RFI, but are only
concerned if their abode is hot or cold, warm or comfortable.

As a purchasing manager I know once said "that's the best part we can
buy for under a nickel".

73

Bob, K4TAX

You must remember that the parts that go in much of this equipment is
supplied by the lowest bidder.

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.

When price is the major factor quality always suffer. You can't have
both.

On 5/27/2020 6:39 PM, Steve via Elecraft wrote:

> 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.

NK7Z

Re: Quiet Ductless HVAC System

In reply to this post by Elecraft mailing list

Good, Fast, Cheap... Pick two.

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 4:39 PM, Steve via Elecraft wrote:
> You must remember that the parts that go in much of this equipment is
> supplied by the lowest bidder...
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Eric Swartz - WA6HHQ

Re: Quiet Ductless HVAC System

Administrator

And with that, lets let this thread take a rest for now. :-)

73,

Eric
Mooderator
elecraft.com
_..._

> On May 27, 2020, at 8:19 PM, Dave Cole <[hidden email]> wrote:
>
> Good, Fast, Cheap... Pick two.
>
> 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 4:39 PM, Steve via Elecraft wrote:
>> You must remember that the parts that go in much of this equipment is supplied by the lowest bidder...
>