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Max dBm for wireless card in Ireland

  • 25-05-2013 4:14pm
    #1
    Cian_
    Closed Accounts Posts: 30 ✭


    Hi guys,

    just wondering what the max legal transmit power for a wireless card in Ireland is? I know that in the US it's 27dBm but I'd like to know what the max is for Ireland.


Comments

  • #2
    FSL
    Registered Users, Registered Users 2 Posts: 1,456 ✭✭✭FSL


    In Europe at 2.4GHz we are limited by ETSI regulations to 20dbmW.

    That is 20dB gain above 1mW or 100mW Effective radiated power compared to an isotropic (0 gain) aerial. This figure includes the gain from the aerial and losses from cabling.

    So to calculate the EIRP of your system:
    EIRP=Output power of card or access point in dBm – cable loss in dB – connector losses in dB + aerial gain in dBi

    A typical card gives out +15dBmW so the largest aerial allowed is +5dB. However on a typical installation an +8dB aerial can be used as there is quite often a 3dB loss on the aerial cable.

    The exception to the above is France, where the maximum output power is limited to 7dBm (5mW EIRP) at 2.4GHz.


  • #3
    jackwogan
    Banned (with Prison Access) Posts: 46 ✭jackwogan


    just wondering the max is 20 but who monitors this (comreg)? How could they know if it is set at 27 or 20. And if caught what would they do?


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