[RDXA] skype and HF noise (interesting use + query)

[n2ujn at rochester.rr.com]

All,

last Feb 24, on 28.4 MHz and 21.3 MHz, I suddenly began experience intermitten S1->S8 noise.  The noise was almost like the sudden onset of a quiet carrier.  

Initially, I was completely puzzed (a month or so).  Then, as it warmed up, the intermittent noise began subsiding, then, gone completely all summer.

But, over the last week it is back.  Very bad and more on than off, but, still on and off.

So, this morning I turned on my iPad logged into skype and pointed it at my transceiver while tuned to 28.4 Mhz.   

Then, I awakened my daughter had her log into skype and call me on video call so I could see my transceiver from outside the house.

Then, I stood next to my neighbors heater exhaust which is located on the side of his house next to my garage.

While watching my transciever S meter via skype, I managed to completely correlate the onset of noise with the onset of my neighbors heating system via the sound from the exhaust.  Perfect correlation with noise onset at the transceiver with the onset of the heater exhaust from my neighbors home.

So, good news, the puzzle: where is the noise coming from is solved.

Bad news:  I expect heating systems are pretty complex, and, when they emit RFI could be a lot of places.   I had sent this information off to Paul who has a lot of experience in electrical engineering but thought I would ping the reflector.

Has anyone experienced RFI steady onset noise from a furnace system, I am guessing a new one since it just began last Feb 24th?

Any ideas for resolution would be great before I stop by my (fortunately extremely nice) neighbors home?

Thanks in advance everyone. 

Mike