[Elecraft] Ceiling fan interference

[Douglas Hudson]

Brian

Several years ago I had a Casablanka ceiling fan which was mounted in a location where the sun would hit it.  During spring and autumn the sun was in a position so the sunlight would shine through the blades then reflect off a white wall and illuminate a small SCR night light.  The blades chopped the light causing rapid on/off switching of the SCR.   The resulting pulsed RFI drove me nuts for three years.  The pulse frequency was a function of fan RPM.  Change your fan speed and see if it effects your situation.

Doug Hudson
K7CUU

________________________________
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> on behalf of Brian Hunt <huntinhmb at coastside.net>
Sent: Friday, December 15, 2017 2:51:06 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] Ceiling fan interference

Sounds like a pulse width modulation  controlled variable speed DC motor. Their website doesn't give any details other than the DC motor. There is a tech support link on their website you could query them.

Similar to the problems hams have with the new high efficiency furnaces?  I have one of those that I tamed with some ferrite clamp-ons on the thermostat line.

73,
Brian, K0DTJ

> On Dec 15, 2017, at 14:14, VE3NFK <john.turgoose at gmail.com> wrote:
>
> Hi
>
> I have a very nice living room ceiling fan  "Aeratron 50 in. Indoor Silver 3
> Blade Ceiling Fan"
> super high efficiency, very low power and quiet BUT severe radio
> interference  15 khz spacing especially on 80, 40, 160 on my K3 and KX3.
>
>

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to d_hudson at outlook.com