Troubleshooting a suddenly-slow wireless link

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Recently my Raspberry Pi 3's wireless link got slow. My ISP was
the first suspect, but it turns out the Pi3, and only the Pi3,
exhibits slow ping (5ms) and low throughput (2 Mbps). Formerly,
ping was about 1 ms and throughput about 20 Mbps. The change
was sudden, in the space of an afternoon. There was some recovery
overnight, but not enough to use things like YouTube, which formerly
worked well enough to be useful.

One reasonable guess is that a new neighbor has fired up a WAP
that's interfering with the Pi's wifi connection. Are there any
software tools that run on Raspberry Pi3 or a 10.7.5 iMac which
can help to detect wireless conflicts?

My WAP is an Apple Airport Extreme of great antiquity. It has
"just worked" since setup and I've never looked closely at it.  
It is locked, and uses WPA encryption.

Thanks for reading!

bob prohaska

Re: Troubleshooting a suddenly-slow wireless link
On Sat, 15 Sep 2018 03:27:29 +0000 (UTC), bob prohaska

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You might try an app that runs on smartphones called WiFi analyzer. It
will at least show you if there are other WiFis using the same channel
as the Pi. I don't know if it runs on a iphone, mine runs on an

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