topic Re: dBm converted to mW in wireless network in Wireless

dBm converted to mW in wireless network

eigrpy — Mon, 05 Jul 2021 20:18:28 GMT

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)

Re: dBm converted to mW in wireless network

Rasika Nayanajith — Mon, 01 Mar 2021 19:14:04 GMT

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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Re: dBm converted to mW in wireless network

Nicolas Poirier — Mon, 01 Mar 2021 21:00:40 GMT

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

Re: dBm converted to mW in wireless network

eigrpy — Mon, 01 Mar 2021 23:51:08 GMT

I think you are right. Thank you

Re: dBm converted to mW in wireless network

Arne Bier — Sat, 06 Mar 2021 21:15:34 GMT

EIRP = Transmit_Power - Cable_Loss + Antenna_Gain

25 mW == 14 dBm

gain of 3802i dedicated 5GHz antenna = 5 dBi

14+5=19