I was receiving some weak to moderate RFI from my Carrier HVAC unit. I
installed a line filter and ferrites on the power chord. That helped, but I
was not satisfied. Then I installed ferrites on the cable to the thermostat
and that reduced the remaining RFI to extremely faint on a SDR display. Just
about undetectable. I consider that fixed. The lesson for me on that project
was RFI can get out of a piece of equipment on EVERY conductor that comes out
of it. I think we tend to only focus on the power chord because for most
appliances those are the only wires connected to it. My only other comment is
a single pass through a ferrite probably won't reduce a strong RFI source
enough.
Randy KQ6RS
-----Original Message-----
From: RFI <rfi-bounces+r55stan=gmail.com@contesting.com> On Behalf Of James
Jordan
Sent: Friday, February 7, 2020 9:27 AM
To: Kim Elmore <cw_de_n5op@sbcglobal.net>
Cc: rfi@contesting.com
Subject: Re: [RFI] Multi-Stage High Efficiency Air Conditioner Units
Can't be specific on HVAC units, but the Schaffer line filters, available in
various amperage ratings from Mouser can be inserted in the power circuits.
Mouser 631-FN2070[ampere rating]. I Use them on Pentair variable speed pool
pumps at VP5 and they killed very nasty RFI from those motors. I would
negotiate with an installer of higher quality units (Carrier, Trane) (Avoid the
cheap Goodman, Coleman, etc.) that if the unit creates RFI that they will
install appropriate line filters. We have a top end Carrier variable speed
multi-stage unit and I'm not getting any RFI, but my hamshack is quite a ways
from it in a detached garage bonus room so it's still possible some is being
generated.
Good luck. The high efficiency definitely saves electricity.
73,
Jim K4QPL
On Thu, Feb 6, 2020 at 11:19 PM Kim Elmore <cw_de_n5op@sbcglobal.net> wrote:
> My wife has been interested in increasing the efficiency of our air
> conditioner units. It seems that the only path to better efficiency is
> multi-stage/multi-speed units. I recall a lot of talk about the
> horrific RF noise these things generate. Does anyone know of RF-silent units?
>
> Kim N5OP
>
> --
>
> Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU School of Meteorology, CCM,
> PP SEL/MEL/Glider, N5OP, 2nd Class Radiotelegraph, GROL)
>
> /"A great second violinist plays second fiddle to no one." //– Robert C.
> Marsh, Chicago Sun-Times./
>
> _______________________________________________
> RFI mailing list
> RFI@contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi
>
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