Antenna Factor and ERP

Hi, group:

1) I have:
spectrum analyser, antenna with known AF(f)[dB/m] [antenna factor in different frequencies], some device DUT
2) I need:
measure and calculate Effective Radiated Power [ERP in dBm] of DUT
Measuring should be done at distance 3 metres from DUT.

Please give me proper equations.

BR,
Blekot

http://www.ce-mag.com/99ARG/Williams97.html



E(dBμV/m) = V(dBμV) + AF(dB/m) + A(dB), assuming your Antenna Factor calibration curve was measured at a 3 meter distance.

another issue :

I guess you measure AF for EMC application .

If you test the AF in your chamber , you need the normalized site attenuation(NSA)

Because the results of meaurement will be change in different environment .

It may cause 1~2dB error in your meaurement .