I would like to build a small circuit to measure with my oscilloscope the power emitted by the 5.8GHz video transmitters mounted on my drones and searching I found this answer:
https://electronics.stackexchange.com/a/74370/228767
The question recommends using a 50 ohm dummy resistive load.
Why was that value chosen? is it random or can the optimal value be calculated?
Personally I will have to measure signals with power lower than one watt.
Also, to have precise measurements and avoid damaging the video transmitter, is that 50 ohm resistor sufficient, or is a more complex circuit necessary as shown here?