RE: Why does 2.4 GHz draw more power than 5 GHz in STA mode (underwater test), while throughput drops?

Asbjørn — Wed, 08 Oct 2025 08:15:56 GMT

Hello Sheeran,

The plots you shown are interesting, but the data for 5GHz seems to be almost too good. The results you see for the 2.4GHz setup would be as expected. The expectancy would be that data throughput would drop off and require more power.

Q1/Q2: I don't really have a good answer for you on these, so I have to suggest and speculate a bit. How are the antenna for 2.4GHz and 5GHz placed compared to each other and how are they affected by the water? Is the receiver placed out/away from the water? Any cable that go into the water and are the cables connected to the same computer/receiver as the transmitter that goes under water?

If you run the same experiment with the TX connected to a different computer than the receiver, do you get the same result? I'm inclined to believe you have some out of the water crosstalk from TX cable to receiver as the 5GHz seems to be unaffected by the water completely and that is just not realistic.

Best regards

Asbjørn