On 2021-12-02 10:48, [email protected] wrote:
Actually, for now, Rx power calibration is what I am interested in. As
I understand, should I set the RF gain level in my application when I
close to the specific frequencies which are measured before?
I'm not sure what you mean by this--I'm guessing it's because English
isn't your first language, and I apologize for failing to understand.
The general approach is that for *EACH*:
- frequency-setting
- gain
-sample-rate
You present several known power levels to the RX port, not to exceed
-15dBm or so. Once you have that, you can generally plot an
interpolated curve
(which over most of the range should be very close to a straight slope).
Now, when your application needs to know the power levels it's seeing,
you can just consult the tables associated with your generated
calibration curve.
Keep in mind that SDRs are sampling *voltages*, NOT power. Which
means that the *power* in a signal is proportional to:
AVG(I*I + Q*Q)
Calibration simply helps you figure out what the proportionality
constant is for any given hardware-parameter setting.
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