[Elecraft] OT: RFI from Modern Furnaces

[Jack Smith]

We have a Carrier high efficiency propane furnace nearly 20 years old 
with an inverter powered blower motor. It radiates RFI in the 100-300 
KHz range, but fortunately nothing higher.

Jack K8ZOA


On 3/4/2010 11:47 AM, Don Nelson wrote:
> Hi all,
>
> There was a discussion some time ago about RFI emanating from front loading
> washers.
>
> This note is about the possibility of RFI emanating from microprocessor
> controlled house furnaces. We had to have our house furnace replaced last
> week because of a failure. Yes we winter camped for a over a day as a
> result. We now have a 95 percent efficient microprocessor controlled furnace
> installed. I did not think about possible RFI that it might emit at the time
> of choosing that furnace.
>
> The good news is that I have not found any RFI on the HF bands as yet while
> the furnace is active or not active. My question to the group is: was I
> lucky? The furnace control has a very nontrivial computer control and could
> cause plenty of noise. It would be nice to think that the designers of
> furnace control systems are sensitive to RFI radiation issues.
>
> The furnace is a Lennox model G71MPP.
>
> Don, N0YE
>