[Discuss-gnuradio] USRP + RFX2400 - Emitting power control

[Arthur]

Hello everybody,

I am currently working with USRP and RFX2400, and I would like to have
accurate control over the power that I am emitting.
Actually, I have seen that:
-> the gain parameter does not have any impact
(gain_range[gmin,gmax,step] = [0,0,1])
-> the power level is somehow controlled by the amplitude parameter

And my questions are:
- What is the ""exact maximum"" of the amplitude to reach the specified
maximal power of 17dBm (50mW)? (Is that 16000?)
- By the way, what is the relationship between amplitude and power? Is
"power = coefficient * (amplitude)2"? Or is the power only proportional
to what the board can/decides to provide as Voltage * Intensity at the
antenna?
- In the o'scope utility provided by the sources, what are the two
signals I can observe when using 1 card/1 antenna? Are these two signals
Q and I? What are the y-axis units? Is it an expression of the power or
of the amplitude (like sqrt(2)*amplitude, but with one zero missing)?

Thank you in advance for your support,
Arthur Schmitt