Oh,.....this wonderful digital age. Where is FCC??????
Why even have Part 15 if there is no enforcement?????
I know, ....., I'm opening a forbidden can of worms, but.........
Dave - WØLEV
On Wed, Aug 11, 2021 at 7:22 PM Hare, Ed, W1RFI <w1rfi@arrl.org> wrote:
> Switching regulators make noise ever N kHz, with N being the free running
> frequency of the internal circuitry. The noise can be almost a carrier to
> just broadband buzz every N kHz, with a 120- or maybe 60-Hz component.
> They are also drifty with temperature, change frequency with load changes
> and when there is a voltage dip or surge, they do a little burble or change
> in frequency to match.
>
> -----Original Message-----
> From: RFI <rfi-bounces+w1rfi=arrl.org@contesting.com> On Behalf Of Mike
> Martin
> Sent: Wednesday, August 11, 2021 1:45 PM
> To: Pete Smith N4ZR <pete.n4zr@gmail.com>
> Cc: AA5CT via RFI <rfi@contesting.com>
> Subject: Re: [RFI] Mystery noise
>
> Hey Pete can you send that to me please
>
> Be safe,
> Mike Martin
> RFI Services
> 51 W Bay Front Rd
> Lothian, MD 20711
> 240-508-3760
>
> On Aug 11, 2021, 10:39 AM, at 10:39 AM, Pete Smith N4ZR <
> pete.n4zr@gmail.com> wrote:
> >I don't know if the reflector will allow this image, but thought it was
> >
> >worth a try.
> >
> > This thing shows up periodically - happily not often. The
> >periodicity makes me think switching power supply, but aren't they
> >normally discrete , sometimes noisy, sometimes drifty but fairly narrow
> >
> >critters? This has a substantial 120-Hz component, but why every 19
> >KHz?
> >
> >--
> >73, Pete N4ZR
> >Check out the new Reverse Beacon Network web server at
> ><http://beta.reversebeacon.net>.
> >For spots, please use your favorite
> >"retail" DX cluster.
> >
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> >http://lists.contesting.com/mailman/listinfo/rfi
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>
--
*Dave - WØLEV*
*Just Let Darwin Work*
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