[RFI] Fwd: RFI Digest, Vol 241, Issue 20

Steve Dyer W1SRD w1srd at yahoo.com
Tue Feb 14 15:05:54 EST 2023


Great article. Thanks for posting.
I need to move further out into the sticks. My problem is noise from my 
neighbors, not my house...
GL on the new system.
73,
Steve
W1SRD


On 2/14/2023 11:52 AM, Steve London wrote:
> I am very concerned about RFI from any new HVAC systems manufactured 
> and installed since new energy savings codes went into effect in 
> mid-2019.
>
> For examples of modern, RF-noisy HVAC systems, and possible 
> mitigations, see 
> https://viennawireless.net/wp/wp-content/uploads/2021/09/HILLSON_RFI_PDF_3SEP2021.pdf 
> .
>
> As you say, yours was installed in 2013.
>
> My current furnace was installed in 2004. Single speed, no ECM. Yes, 
> the fan draws 800 watts when it's running. Nearing end-of-life, so I'm 
> carefully shopping.
>
> 73,
> Steve, N2IC
>
>
>
> On Tue, Feb 14, 2023 at 12:37 PM Steve Dyer W1SRD via RFI 
> <rfi at contesting.com> wrote:
>
>     Steve,
>     I guess you don't believe and want some evidence.
>     I have the Bryant Evolution Extreme (equivalent system to the Carrier
>     Infinity Greenspeed) and it is RF quiet. It was one of the
>     conditions of
>     purchase I made with the installer. Both the air handler and
>     compressor
>     are VS.
>     This is a 2013 vintage system so I have a few thousand hours in
>     front of
>     the radio with the system on and off.
>     I live in a rural location so it's not masked by local noise. The
>     beams
>     are within 100'.
>     I can stand right next to the outdoor unit with a SW radio and barely
>     hear anything.
>     I am extremely pleased with the systems lack of RFI, efficiency
>     and home
>     comfort.
>     Variable speed systems can be engineered well for EMC.
>     73,
>     Steve
>     W1SRD
>
>     On 2/14/2023 11:17 AM, Steve London wrote:
>     > Better yet, show us spectrum displays of about 100 kHz width, on
>     the band
>     > with the closest antenna, when the band is dead, with the fan
>     running, and
>     > with the fan off.
>     >
>     > 73,
>     > Steve, N2IC
>     >
>     > On Tue, Feb 14, 2023 at 12:05 PM James Jordan <k4qpl2 at gmail.com>
>     wrote:
>     >
>     >> I have a Carrier "Infinity" system with fully VS drives on both the
>     >> compressor and air handler fan. It's their top of the line most
>     efficient
>     >> system. Never heard a peep of RFI from it. I'll walk closer to
>     the units
>     >> with an AM radio to see if I'm missing something and if I hear
>     anything
>     >> I'll post again.
>     >> 73,
>     >> Jim K4QPL
>     >>
>     >> On Tue, Feb 14, 2023 at 12:57 PM Dennis Monticelli <
>     >> dennis.monticelli at gmail.com> wrote:
>     >>
>     >>> The variable speed fan motors are bad news. Fixed speed or
>     multiple
>     >> fixed
>     >>> speed (selected by winding) are fine.  However the fan motor
>     isn't the
>     >> only
>     >>> motor in the system.  Look into the compressor too.  There is
>     also a
>     >> lesser
>     >>> chance that the controller board generates noise you can pick
>     up.  If
>     >>> accessible during installation, some ferrite sleeves on the
>     digital
>     >> board's
>     >>> wires are a good idea.
>     >>>
>     >>> Both of my Daikin HVAC units are completely quiet but those
>     models were
>     >>> chosen with no PWM drive motors and I did put ferrites on the
>     controller
>     >>> board for extra insurance.
>     >>>
>     >>> Dennis AE6C
>     >>>
>     >>> ---------- Forwarded message ---------
>     >>> From: <rfi-request at contesting.com>
>     >>> Date: Tue, Feb 14, 2023 at 9:00 AM
>     >>> Subject: RFI Digest, Vol 241, Issue 20
>     >>> To: <rfi at contesting.com>
>     >>>
>     >>>
>     >>> Send RFI mailing list submissions to
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>     >>>
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>     >>> than "Re: Contents of RFI digest..."
>     >>>
>     >>>
>     >>> Today's Topics:
>     >>>
>     >>>     1. RFI from Carrier Heat Pump? (RVZ)
>     >>>
>     >>>
>     >>>
>     ----------------------------------------------------------------------
>     >>>
>     >>> Message: 1
>     >>> Date: Tue, 14 Feb 2023 04:54:07 +0000 (UTC)
>     >>> From: RVZ <rlvz at aol.com>
>     >>> To: rfi at contesting.com
>     >>> Subject: [RFI] RFI from Carrier Heat Pump?
>     >>> Message-ID: <735693955.1361834.1676350447226 at mail.yahoo.com>
>     >>> Content-Type: text/plain; charset=UTF-8
>     >>>
>     >>> Hi Guys,
>     >>> ?I've seen posts where some Air Conditioners and Furnace units
>     with
>     >>> variable speed motors create RFI on the Ham Bands.? I'm
>     thinking of
>     >>> purchasing a new Carrier 3.5 ton Heat Pump, Model 25SCA542,
>     with a "fixed
>     >>> speed" blower and am wondering if anyone has had RFI issues with
>     >>> these??Thank You in advance for your thoughts.?73, Dick- K9OM? (
>     >>> RLVZ at aol.com
>     >>> )
>     >>>
>     >>> ------------------------------
>     >>>
>     >>> Subject: Digest Footer
>     >>>
>     >>> _______________________________________________
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>     >>>
>     >>>
>     >>> ------------------------------
>     >>>
>     >>> End of RFI Digest, Vol 241, Issue 20
>     >>> ************************************
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