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I have a Raspberry Pi 3 B that runs Debian 8.0. So far I didn't install anything and only run raspi-config.

I want to use the onboard Wifi card, and I can connect to my 2.4Ghz Wifi, but none of the 5Ghz ones.

iwlist wlan0 scanning just doesn't show them up. Also, the bitrates are only max 54Mb/s:

Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s

Do I have to enable something?

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The Raspberry Pi 3 B only has 2.4GHz wireless, not 5GHz.

Specs here.

  • Ok so 54 Mb/s will be the fastest possible? – Daniel Apr 2 '16 at 7:23
  • I couldn't work out whether that was a limitation. Apparently 802.11n goes "up to" 600Mb/s but I couldn't easily find more detail. – Mark Smith Apr 2 '16 at 7:41
  • My bad - sorry. I thought 802.11n is 5Ghz only. But the RPi should still support more than 54Mb/s, right? – Daniel Apr 2 '16 at 7:41
  • @Daniel No, all 802.11g speeds above 54Mb/s(the standard-defined limit) are wireless hardware venndor-brew extensions, like D-Link 108Mbit/s SuperG. And they can work only if supported and implemented in hardware by both sides – Alexey Vesnin Apr 3 '16 at 13:42
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5ghz is 802.11a. Max select-able "physical rate" will be 54Mb/s but the n standard lowers guard interval and increases spatial streams (MIMO)to get the higher rates. From memory on a single antenna and 20mhz channel 70Mb/s ish will be the most you will get. Change to 40mhz channel an 150Mb/s should be doable, having bluetooth running will knock this down though. To get the 600Mb/s you will need 4 antennas and 40Mhz channel width.

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    I think your answer could be a little more clear, and maybe requires a bit more explanation. – Darth Vader Apr 3 '16 at 14:11
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try turning power save off

  • sudo su
  • cp /etc/network/interfaces interfaces.bak
  • echo "post-up iwconfig wlan0 power off" >> /etc/network/interfaces
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    ive made a roundup of solutions to fix different wifi adapters on raspberry pi 1/2/3/zero nwgat.ninja/fixing-raspberry-pi-network-issues – nwgat Apr 16 '16 at 14:45
  • @wiak thanks those are helpful. One recommendation: change your sudo echo [whatever] > /etc/[whatever] to echo [whatever] | sudo tee -a /etc/[whatever]. sudo echo doesn't actually allow you to write to a non-user-writable file. So pipe it to a sudo'ed tee instead of redirecting it to a write-locked file. – Adam Plocher Feb 11 '17 at 23:59

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