[RFI] RFI from furnace/air conditioning

[Ed]

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 at contesting.com] On Behalf Of D C _Mac_ Macdonald
Sent: Friday, November 02, 2018 6:05 PM
To: RFI Group <rfi at 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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