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  1. #1
    Junior Member ravenwest is on a distinguished road
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    Sep 2016

    Question TL-WN722N Antenna Effective Power

    Model :

    Hardware Version :

    Firmware Version :

    ISP : [/COLOR]

    In specs of TL-WN722N indicated that the power (EIRP): 20 dBm.
    And antenna gain is 4 dBi.
    So that means 20 dBm includes 4 dBi of antenna's gain? or not?

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  2. #2
    Members kevsh is on a distinguished road
    Join Date
    Apr 2014
    Yes, that is correct EIRP = Effective Isotropic Radiated Power. This is the amount of signal the antenna efficiently radiates. All high gain antennas manipulate the signal
    not amplify. The specs could be misrepresented but I doubt this. A consumer can go to the FCC ID, search here https://www.fcc.gov/general/fcc-id-search-page and find
    anything related to the products R&D. 20dbm EIRP means the antenna radiates this amount of signal. dbm is also a logarithmic amount of measurement. 20dbm= 100 milliwatts each time you add 3dbm you increase
    that signal x2 times. The antenna is 4dbi this is a 2.5x change in signal so that means the actual transmit power would be 16dbm = 40 milliwatts of transmit
    power to the antenna.
    Last edited by kevsh; 10-04-2016 at 14:57.

  3. #3

    TL WN722N Antenna Effective Power

    Hi, Yes this is the correct reading.To give the antenna a ground plane there is a built-in coil, and this is what you are measuring.Andy


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