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Maximum legal wifi power output?

Discussion in 'Networks & Internet Connectivity' started by Energize, 21 May 2007.

  1. Energize

    Caporegime

    Joined: 12 Mar 2004

    Posts: 28,584

    Location: London

    Does anyone know what the maximum power output you are allowed to broadcast wifi with?
     
  2. benjo plz.

    Capodecina

    Joined: 15 Jan 2004

    Posts: 14,208

    Location: Hall

    The most I've come across without any sort of external amp is 700mw.
     
  3. csmager

    Soldato

    Joined: 30 Dec 2003

    Posts: 5,770

    Location: London

  4. tolien

    Caporegime

    Joined: 16 May 2003

    Posts: 25,368

    Location: ::1

    Ofcom say 100mW:

    Though that seems low...
     
  5. csmager

    Soldato

    Joined: 30 Dec 2003

    Posts: 5,770

    Location: London

    Tis correct though. My WAP54G has default output power of 22mW - although obviously the EIRP will be higher after the 5dBi antenna.

    With firmware hacks it'll go up to 84mW, but that's likely to be 'illegal' levels of power. It also makes it crash more than I'd like.
     
  6. LewisStuart

    Mobster

    Joined: 20 Jan 2004

    Posts: 4,127

    Location: Fife

    I've just been playing with the output power on my WRT and can get a stable 24Mbps with only 2mW :eek:

    Should save a few brain cells :D
     
  7. Cyber-Mav

    Capodecina

    Joined: 30 Jul 2005

    Posts: 14,079

    Location: Midlands

    go for even 1000mw, i doubt anyone is actually gonna go around and check everyones wifi output.
     
  8. Mr. Brightside

    Wise Guy

    Joined: 27 Apr 2004

    Posts: 2,378

    100mW. Though I can run my WRT54G at 254mW (modded it with heatsink and fan), it seems to make no difference - I guess the clients would need to increase transmit power too.
     
  9. csmager

    Soldato

    Joined: 30 Dec 2003

    Posts: 5,770

    Location: London

    And also because it's logarithmic. If you put it on a dB scale, 100mW is 20dB and 254mW is a mere 24dB. Not that significant.
     
  10. Shaz]sigh[

    Wise Guy

    Joined: 8 Sep 2003

    Posts: 1,374

    Location: Outside

    Although the mw rating is useful, you're forgetting to include the gain produced by the aerial.

    Although I should know this (it's in the BCMSN after all) I've forgotten.

    Got a feeling it's around 20-24dBm for ETSI (ie, us) and 36dB for America.

    *just had a quick google and looks like it's 20*
     
    Last edited: 22 May 2007