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Re: [RFI] RFI from furnace/air conditioning

To: rfi@contesting.com
Subject: Re: [RFI] RFI from furnace/air conditioning
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Sat, 3 Nov 2018 10:29:50 -0700
List-post: <mailto:rfi@contesting.com>
Hi Ed,

Simply clamping a ferrite onto a wire carrying RF noise has little effect on it on the HF bands. We must wind turns of the wire through the core.  I wrote a tutorial on this a few years ago for NCJ.  It's on my website. http://k9yc.com/KillingReceiveNoise.pdf

73, Jim K9YC

On 11/3/2018 5:39 AM, Ed wrote:
I believe we have the same HVAC unit as you do and indeed found some 
unacceptable RFI coming from the unit. Lennox is actually aware of this and 
will provide a filter kit (ours was at no cost) consisting of an AAC line 
filter and a couple clamp on ferrites. Once installed this helped significantly 
but did not eliminate the problem.  I added a couple more mix 31 doughnuts in 
place of their clamp-on's and also  added one on the thermostat line at the 
thermostat and the problem seems to have been reduced to the point where my 
antennas do not see the noise.

Contact your local installer and ask for the kit or contact Lennox directly.

Ed - VE4EAR

-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of D C _Mac_ Macdonald
Sent: Friday, November 02, 2018 6:05 PM
To: RFI Group <rfi@contesting.com>
Subject: [RFI] RFI from furnace/air conditioning

I have fairly recently gotten back on the air after a few years off.  This is 
AFTER I had to have our HVAC replaced.  It is a Lennox SL280UH090V48B-03 which 
is a variable BTU and variable speed fan system.  Lots of trash, especially on 
20 meter band.  Does anyone here have experience with Lennox systems in general 
or my specific unit ?

73 de Mac, K2GKK/5​
(Since 30 Nov '53)​
Oklahoma City, OK​
USAF Retired 61-81​
FAA Retired 94-10

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