dBm converted to mW in wireless network

[eigrpy]

Hello, 

Based on the formula below, dBm 19.979 should be 99.51mW, but a window box in Ekahau shows it is 25mW. Please see the screenshot below. Are there any one who can tell what the issue is? Thank you

P(mW) = 1mW ⋅ 10^(P(dBm)/ 10)

[Rasika Nayanajith]

Hi David,

I think that should be a bug of Ekahau, pls report to them and they should fix it

HTH

Rasika

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[Nicolas Poirier · Accepted solution]

Hello David,

Don't forget to take the antenna gain into account.

With an antenna gain of 4 dB and a transmit power of 25 mW, the EIRP is 25 x 4 = 100 mW (20 dBm).

PS: here is the EIRP formula: (RF Power - cable loss) * Antenna Gain

[eigrpy]

I think you are right. Thank you

[Arne Bier]

EIRP = Transmit_Power - Cable_Loss + Antenna_Gain

25 mW == 14 dBm

gain of 3802i dedicated 5GHz antenna = 5 dBi

14+5=19