When building a product with an RF transmitter inside, one of the important things is to ensure that it complies with the CE requirements. So being able to measure the radiated power, both of the carrier and the harmonics, without paying the EMC-test lab every time, would be a great tool.
So I was experimenting with measurements on the soccer field next to our office, but I'm unsure if it is even possible to do within 2-3 dB error margin.
I can see that a "real" OATS needs a metallic ground plane beneath the transmitter and the receiver.
My idea was to place the DUT and the receiver 3 meters apart and 1 meter above ground. Then follow the steps below:
- Measure received power from the DUT.
- Substitute the DUT with a signal generator + antenna with know gain.
- Measure received power from substitution.
- Calculate DUT power as difference between 1) and 3).
Does anybody have any experience with this?