5 GHz WiFi goes down when doing upload portion of a speed test
This just started happening within the last couple of weeks. When I run a speed test or upload a large file to a high-bandwidth destination on my Win10 desktop, routers 5 GHz wireless stops working. I noticed that it would stop working when the speedtest was ramping up, with it failing at 320 mbps on the upload speed test. The 2.4 GHz network stays up though. I do not have the same issue occur with my MacBook Pro, which will pull 550mbps in both directions when right next to the router without issue, and will pull roughly the same speeds as the desktop when I put the MBP near the desktop.
So with that, I know it's not location or any sort of weird issue with the router not handling the bandwidth.
I dabble in amateur radio and am wondering if the 5 GHz radio on my PC is overloading the front end receiver of the 5 GHz radio on the router?
Equipment:
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Built Windows 10 computer with a TP-Link Archer T6E PCI-e wireless card (latest firmware from May 2019) with antennas relocated to window sill. Have tried pointing the rabbit ears both vertical and at 45 degrees with the same result.
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ASUS AC1700 (RT-ACRH17) running both 2.4 (auto ch. 6) and 5 GHz (auto ch. 44) networks. Tried channel 165 but would only get 15-20mbps on that. Channels 44 and 165 have no other networks on them.
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AT&T Fiber (1 gbps connection) modem/router with wireless radios turned off.
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2018 MacBook Pro
Posted Jul 7, 2020, 12:38 PM UTC
set QoS (or similar) so that the upload test does not suck all of the available bandwidth away from the other clients.
It's not an issue with using the bandwidth though. It's the fact that it "blinds" 5 GHz radios when using 30% of the slotted bandwidth. Even for a second or two, it'll do it.