[AMRadio] interference from 3810 khz to 3910 khz


Bob Macklin macklinbob at msn.com
Tue Jul 12 13:33:08 EDT 2005


I have heard that some consumer electronics that use microcontrollers
operate with FM'ed clocks to reduce the Part 15 emmissions by spreading it
out. And many appernetly use clocks in the 75M range.

Bob Macklin
K5MYJ/7
Seattle, Wa.

"REAL RADIOS GLOW IN THE DARK"

----- Original Message ----- 
From: "Geoff" <w5omr at satx.rr.com>
To: "Discussion of AM Radio" <amradio at mailman.qth.net>
Sent: Tuesday, July 12, 2005 10:12 AM
Subject: Re: [AMRadio] interference from 3810 khz to 3910 khz


> kenw2dtc wrote:
>
> > "Anyone else picking up interference from 3810 khz to 3910 khz ?  It
> > sounds like a swept buzzsaw"
> >
> > *******I work the 3870 to 3890 portion of the band and every once in a
> > while, I hear it slide through the frequency like a slow VFO.  Others
> > on frequency from NJ to Maine also hear it.  It's not on all the time???
> >
> > 73,
> > Ken W2DTC
> >
> > __
>
>
> I hear that in south Texas, too...
>
> When I hear it on some of the higher frequencies, I always thought it
> might be an audio version of where the MUF was...
> As screwy as the sunspot cycle has been, the MUF could have been as low
> as 3.9MHz.
>
>
> ---
> 73 = Best Regards,
> -Geoff/W5OMR
>
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