AP logs strong wifi noise signal

wifi
noise

asked 2023-02-23 20:46:50 +0000

sugar76
9 ●3 ●5 ●8

updated 2023-02-23 20:47:58 +0000

In the logs of my AP I see many log messages about a strong noise signal detection on channel 36.

23.02.23 21:02:21 [fritz.powerline] Eine sehr starke Störquelle wurde auf Kanal 36 (Frequenz 5.180 GHz) erkannt, automatischer Kanalwechsel ausgeführt.

23.02.23 21:02:10 [fritz.powerline] Eine sehr starke Störquelle wurde auf Kanal 36 (Frequenz 5.180 GHz) erkannt, automatischer Kanalwechsel ausgeführt.

23.02.23 21:01:59 [fritz.powerline] Eine sehr starke Störquelle wurde auf Kanal 36 (Frequenz 5.180 GHz) erkannt, automatischer Kanalwechsel ausgeführt.

23.02.23 21:01:40 [fritz.powerline] Eine sehr starke Störquelle wurde auf Kanal 36 (Frequenz 5.180 GHz) erkannt, automatischer Kanalwechsel ausgeführt.

After switching to channel 40 the log messages don't appear anymore.

I recorded a trace of the AP's Wifi interface: https://1drv.ms/u/s!AphLkdj_V9pOqAYTT...

I wonder if somebody can see any hint in the trace what could be the cause of the noise signal (I do not see anything)?

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answered 2023-02-24 06:48:11 +0000

Jaap

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At the level of packet capture you won't see anything, and that's the whole point. What the log is telling is that the RF receiver, or rather the demodulator, has a tough time separating the signal from the total received RF energy. This because some other source is emitting that energy. As far as the signal can be separated from the noise, packets can be received and will they end up in the capture, so the only thing you might see is fewer than you would normally expect. The RF source would need to be tracked by a receiver at various places, using the received signal strength indication, or with a spectrum analyser, which can pick up this noise from all other RF, and on various places, to be able to pinpoint it.

Comments

Ok I feared the packet capture can't tell me anything ... Still thanks for you explanation +1

sugar76 ( 2023-02-24 08:48:29 +0000 )edit

Somehow it's strange as the AP is located in a cellar where it should be unlikely to receive strong noise signals.

sugar76 ( 2023-02-24 08:52:16 +0000 )edit

Could be any kind of electrical equipment. Any motion sensors around?

Jaap ( 2023-02-24 10:59:05 +0000 )edit

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