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For cabled/conducted testing, path loss between DUT & Test equipment is calculated from cumulative insertion loss from any adapters, co-axial cables, attenuator pads etc.

But for over-the-air/radiated testing, how can one calculate/characterize loss between a DUT antenna & test antenna inside the RF Chamber. I understand RF chamber is almost equivalent to Free Space, and there is a Free Space Path Loss (FSPL) associated based on Frequency & Distance, but would that suffice to calculate the loss?

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  • \$\begingroup\$ Free space PathLoss is 22dB + 20*log10(distance/wavelength) \$\endgroup\$ – analogsystemsrf May 9 '17 at 4:06
  • \$\begingroup\$ Ever heard of folk calibrating their test house equipment? \$\endgroup\$ – Andy aka May 9 '17 at 7:24
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Yes, and if your anechoic chamber is large enough, and well covered in RAM, you can try backing up your transmitter in measured increments, and plotting the results at each step. You can then check your results against the free space model.

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