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I was looking for weather broadcast on 8.3kHz but found my neighbors washingmachine instead (infosec.pub)

submitted 2 months ago by einfach_orangensaft@sh.itjust.works to c/amateur_radio@lemmy.radio

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Antenna was about 20m of random wire coil on a sound card, recorded with Friture.

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[–] A_Union_of_Kobolds@lemmy.world 13 points 2 months ago (3 children)

Shouldn't be 3-phase unless that's common wherever you are. Pretty much every washing machine I've seen just goes on a normal SP20A circuit.

[–] einfach_orangensaft@sh.itjust.works 13 points 2 months ago (1 children)

There isnt 3-phase mains going into the device, but i assume is uses a 3-phase brushless motor with a driver circuit for speed control

[–] A_Union_of_Kobolds@lemmy.world 8 points 2 months ago* (last edited 2 months ago)

Yeah could be, that would make sense. I confess, I haven't opened many of them up.

With the frequency jumps I'd say you're right

[–] Scubus@sh.itjust.works 3 points 2 months ago

I wiuldnt say common, but I've seen a couple 3 phase washing machines in my area. Midwest US

[–] mycelium_underground@lemmy.world 1 points 2 months ago

If it says inverter on it, it's using a 3 phase brushless motor. It might be 3ph even if it doesn't say it.

[–] einfach_orangensaft@sh.itjust.works 7 points 2 months ago

Update i found another one with slightly less max RPM:

[–] barbedbeard@lemmy.one 4 points 2 months ago

WoW

[–] early_riser@lemmy.radio 2 points 1 month ago

Interesting. My AC fan has a noise pattern that revs up as the AC or heater starts. I can hear it on the radio before I hear the fan itself.

[–] HopelessDemigod@mstdn.social 0 points 1 month ago (1 children)

@einfach_orangensaft

8.3 KHz?

[–] einfach_orangensaft@sh.itjust.works 1 points 1 month ago

yes, there are a few signals down there http://funknetzplanung.com/frequenzplan.php 8,3 - 9 kHz WETTERHILFENFUNKDIENST D54A ziv Wetterhilfenfunk 8,3 - 9 kHz (weather emergency service)