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Eliminating PoE interference (lemmy.radio)

submitted 2 days ago by early_riser@lemmy.radio to c/amateur_radio@lemmy.radio

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I have an Ethernet cable running PoE+ to a wifi access point outside my shack that is very close to my radios. It exhibits the typical QRM pattern, with birdies at regular intervals making a warbling sound when the rig is on SSB.

I've eliminated this problem before using chokes, but this cable is thicker (meant for outdoor use) and much closer, it runs along the same cable runway as my antenna feedlines.

I'm pretty sure the cable isn't shielded. I just bought the cheapest thing I could find on Amazon. I wouldn't trust it if it did say it was shielded. Anyway, would getting a higher category of cable help the issue? Should I try choking the cable at a different point? I did it at the switch end, not the AP end.

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[–] aubeynarf@lemmynsfw.com 1 points 2 days ago (1 children)

is the power supply or switch some bargain basement stuff? No-name chinese switched power supplies are garbage. I have an LED power supply that generates interference all the way up through 2 m.

for many POE devices, you could inject voltage from a linear power supply onto the wires. Might be an option if the device isn’t too “smart” about it’s POE protocol.

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

Both the switch and the WAP are Ubiquiti, a reputable brand. The AP does not use passive PoE.