[RFI] RFI from new Hi-efficiency furnace?

[doc at kd4e.com]

Thanks!

Will have a look at those with my handy-dandy AM-SW handheld
receiver.

> I have a high efficiency Rheem furnace, going strong for 10 years.  The
> only RFI I get from it is during ignition of the burners ( a burst of
> "machine gun static" for about 2 seconds).  The burst is audible on all
> bands 160m thru 6m on any HF or 6m radio.  (No antenna is closer than 50
> feet to the house.)  The burst is not real loud and it is of short
> duration, so I am willing to live with it.  The furnace motors (air
> handler and combustion blower) are both AC induction types.  My high
> efficiency A. O. Smith gas-fired water heater causes no RFI at all.  It's
> located near the furnace, but I think it uses a hot plate method for
> ignition, rather than a spark.  Its combustion blower is also an AC
> induction motor.
>
> As a side note, the church I attend has 8 high efficiency A/C-Heat Pump
> units that were installed early last year.  While we don't have any radios
> there, we do have a sound system with lengthy (150 feet, or longer)
> microphone cables.  I had some reservations about these new units because
> they all employ inverters with variable speed blowers and compressors. Low
> impedance mic lines do offer a lot of common mode noise rejection, but the
> building is old and I have no idea as to just how good (or not) our
> grounds are at the various power outlets.  In any event, whatever noise is
> created by those 8 units is not showing up in the sound system, and I'm
> glad of that.
>
> 73, Dale
> WA9ENA


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Thanks! & 73, doc, KD4E
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