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[RFI] Bleh (Re: HVAC Variable Speed Motors

To: rfi@contesting.com
Subject: [RFI] Bleh (Re: HVAC Variable Speed Motors
From: Peter Laws <plaws0@gmail.com>
Date: Thu, 6 Jan 2011 09:22:48 -0600
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
On Sat, Apr 10, 2010 at 21:19, Peter Laws <plaws0@gmail.com> wrote:

> I have a WaterFurnace Envision and I don't hear it.  Or at least if
> there is RFI, it's not enough to bother me.
> I hear my Whirlpool Duet washing machine (oh, do I hear it).
> But the heatpump is quiet.  Looking at the specs, though, it seems to
> have a variable-speed fan.  Maybe they shield?  They have extensive
> documentation on their site if folks are interested.

WaterFurnace was installed Fall 2007.  Very happy with the energy
results (all-electric house and only three bills over $100 since it
was installed).  NO RFI attributable to the system ...

Until last night.  Local 10-m net, conditions very quiet on 28445, but
no quieter than a number of other nights.  Very distinct noise just as
the fluid pump started just before the main unit started up.  Stayed
on the duration of the cycle.

I did not explore other bands or freqs, but will have the opportunity
this weekend during RTTY Roundup.

So, what changed?  I haven't changed anything with the antennas or the
rig since last week's net, in fact, I'm not sure I've had the rig on
even to listen.  I doubt the noise was there previously but buried as
this particular noise is quite distinct as the unit starts the cycle
and it was immediately obvious that it was the heatpump since the
radio room is steps from the furnace closet.

Peter Laws | N5UWY | plaws plaws net | Travel by Train!
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