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

rf math

Hi,

How is that possible 

 

25mW =eirp(17dBm)

 

 

Thanks 

Guru Elite
Posts: 21,281
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

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

Re: rf math

Hi

Sorry for that , i forget to post the gain part

Thank you 

 

 

MVP
Posts: 518
Registered: ‎11-04-2011

Re: rf math

EIRP = Transmit power - Losses + Gains

https://en.wikipedia.org/wiki/Equivalent_isotropically_radiated_power

 

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.

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