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+Measure amplifier non-linearity using two-tone signal
+=====================================================
+
+HOWTO
+-----
+
+ # Take a USRP B200
+ # Connect its TX to the amplifier you want to measure
+ # Connect the amp to an big enough attenuator
+ # Connect to the B200 RX
+
+The amplitude ramp script is going to generate a two-tone (1kHz separation)
+signal at 222MHz, and record outgoing signal magnitude and phase difference
+against the source signal. The measurements are written into a CSV file.
+
+It's your job to ensure you don't overload the B200 input signal power (-15dBm
+last time I checked).
+
+First step is to gather some measurements:
+
+ ./amplitude_ramp.py --ampl-start 0.15 --ampl-stop 0.5 --ampl-step 0.01 --num-meas 300 --txgain 77
+
+This creates a measurement.csv file you can analyse with
+
+ ./plot.py
+
+That's it for now.