Wireless Access

Occasional Contributor II
Posts: 81
Registered: ‎01-16-2016

rf math


How is that possible 


25mW =eirp(17dBm)




Guru Elite
Posts: 21,492
Registered: ‎03-29-2007

Re: rf math

Please show us the whole screenshot so you know what you are talking about.

Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Occasional Contributor II
Posts: 81
Registered: ‎01-16-2016

Re: rf math


Sorry for that , i forget to post the gain part

Thank you 



Posts: 554
Registered: ‎11-04-2011

Re: rf math

EIRP = Transmit power - Losses + Gains



From your screenshot: 14mW Transmit power, 0 dB loss, 5 dB antenna gain.


1 mW = 0 dBm by definition

2 mW = 3 dBm

4 mW = 6 dBm

8 mW = 9 dBm

16 mW = 12 dBm


And 12 dBm (which is the 16 mW transmit power) - 0 dB (cable loss) + 5 dB (antenna gain) = 17 dBm EIRP.


So the EIRP depends on the antenna gain, which makes it possible in your first screenshot that the same transmit power results into different EIRP values.

If you have urgent issues, please contact your Aruba partner or Aruba TAC (click for contact details).
Search Airheads
Showing results for 
Search instead for 
Did you mean: