Re:USB 3.0* Radio Frequency Interference on 2.4 GHz Devices ...
by betterunix2 on Tuesday March 30, 2021 @09:02AM
(#26634072)
The big chunk around 5ghz is more restricted e.g. DFS/TPC requirements. Using 160mhz channels is impossible in my NYC area apartment because of those restrictions.
Re:USB 3.0* Radio Frequency Interference on 2.4 GHz Devices ...
by jlv2 on Monday March 29, 2021 @09:05PM
(#26630252)
Zigbee is in 2.4GHz; Z-Wave is 900MHz.
https://en.wikipedia.org/wiki/Z-Wave#Radio_frequencies
Re:USB 3.0* Radio Frequency Interference on 2.4 GHz Devices ...
by galangalalgol on Monday March 29, 2021 @11:08PM
(#26630916)
Its not just 2.4 that usb3 kills. I've had it jam gps from a couple feet away and thats down at 1.3. Did some emi tests, it was really broadband interference. I really have no idea how these chipsets got approved.
Re:USB 3.0* Radio Frequency Interference on 2.4 GHz Devices ...
by cozzyd on Tuesday March 30, 2021 @12:59AM
(#26631399)
GPS is sub-thermal noise and the receivers don't have a ton of dynamic range. Your GPS may not have a good filter on it and might be saturating, rather than necessarily broad-band RFI.
Re:USB 3.0* Radio Frequency Interference on 2.4 GHz Devices ...
by galangalalgol on Tuesday March 30, 2021 @07:48AM
(#26633480)
We put the device with usb on it in an emi chamber and watched it on a spectrum analyzer. Unless it was in a taped box there was a mountain of noise.
The trouble is that protocols like ZigBee and ZWave and Bluetooth and ANT+ are stuck in the 2.4 GHz band and practically you cannot turn off your 2.4 WiFi access points and be happy.
Thus I have to go to the woods to pair my fitness band with the heart rate sensor because at my house who knows what is going on with the hue light that is on the wrong side of my monitor from the hue hub or the smoke detector that posts the battery status to SmartThings, etc.