Eddy,
The 21 kHz spaced between peak probably originates in a switching power supply
and the loud "whir-whir-whir" noise may be generated by a motor. The slow
movement up and down the frequency may originate from a motor controller
changing the motor speed. The precise timing (1230Z on) sounds like its a
timer turning on a high efficiency motor.
My guess: one of your neighbors recently installed a high efficiency furnace.
I have exactly the same type of RFI originating from a high efficiency heat
pump one mile southeast of me. Thankfully its "only" S7 and the Beverages
eliminate it except to the southeast.
Good luck!
73
Frank
W3LPL
---- Original message ----
>Date: Wed, 16 Jan 2013 08:40:27 -0500
>From: Eddy Swynar <deswynar@xplornet.ca>
>Subject: Topband: RFI / Interfering Phenomenon...?
>To: topband@contesting.com
>
>Hi Guys,
>
>I wonder if what I've been experiencing here is strictly a local case of RFI,
>or if others are hearing it to, especially at stations near southern
>"VE3"-land...?
>
>Specifically, since roughly early December (when I first noticed it), at
>precisely 1230Z each day, & at around 1820-KHz, a loud "whir-whir-whir" noise
>suddenly starts up that is very raspy & broad...it can be heard at roughly
>21-KHz spacings each way, up & down the band, and the entire "progression"
>very slowly moves down in frequency...
>
>It's hard to put into words: imagine the whirring police siren from the film
>"Smokey & The Bandit", only with a very raspy / rough tone, and very broad. It
>peaks here with my K9AY that's pointing due north, causing me to suspect that
>it may well be some automatically timed gizmo that my gadget-crazy neighbour
>several hundred feet north of me may have acquired & "...put into
>action."...but then again, it could be something else, emanating from
>who-knows-where...
>
>Is anyone else experiencing this right at 1230Z, or am I the sole lucky
>winner...? :o)
>
>My operations on 160 are not especially affected by this, as I usually pack it
>in around 1230Z, anyway---still, it HAS piqued my curiosity...
>
>~73~ de Eddy VE3CUI - VE3XZ
>_________________
>Topband Reflector
_________________
Topband Reflector
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