what's the difference between 2.5 and 5 ghz for wifi?
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Is 5 ghz better than 2.5 ghz frequency? Do you need a wifi card that supports 5 ghz to use that setting?
Short answer is 5GHz is faster but has shorter range.
2.4GHz can reach farther and it's older so there's more devices out there that support 2.4GHz than 5GHz.
The fact that there's more devices using 2.4GHz also mean that this frequency has more noise. Which could derive in bad signal
is there a command you can use to see if your wifi card or adapter supports 5 ghz?
Find out the interface name, by running iwconfig
For example:
$ iwconfig
eth0 no wireless extensions.
lo no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:"EvanCarroll"
Mode:Managed Frequency:2.437 GHz Access Point: D8:50:E6:44:B2:C8
Bit Rate=19.5 Mb/s Tx-Power=15 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=61/70 Signal level=-49 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:1 Invalid misc:80 Missed beacon:0
In this case it is wlan0, then run iwlist your-network-interface freq
For example:
$ iwlist wlan0 freq
wlan0 13 channels in total; available frequencies :
Channel 01 : 2.412 GHz
Channel 02 : 2.417 GHz
Channel 03 : 2.422 GHz
Channel 04 : 2.427 GHz
Channel 05 : 2.432 GHz
Channel 06 : 2.437 GHz
Channel 07 : 2.442 GHz
Channel 08 : 2.447 GHz
Channel 09 : 2.452 GHz
Channel 10 : 2.457 GHz
Channel 11 : 2.462 GHz
Channel 12 : 2.467 GHz
Channel 13 : 2.472 GHz
Current Frequency:2.437 GHz (Channel 6)
In this example none of these channels are outside of 2.4 GHz. So it does not support 5 GHz.
http://unix.stackexchange.com/questions/137894/how-do-i-find-out-if-my-wireless-card-supports-5ghz
Another way is if you know what brand and model your adapter is, then you should be able to learn it's working frequency by searching the model in the web.
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