A sensor can be selected from the drop-down menu labelled "Sensor Selection." The graph displays the HH and VV correlator products for both the calibration load (blue and red lines) and the soil signal (green and purple lines). There are some criteria that can be used to evaluate the quality of the data:
* For HH and VV, respectively, the "data" lines (green and purple) should be below the "cal" lines (red and blue).
* Fewer spikes in the data spectra indicate better quality. Interference causes spikes, which means the soil and cal signals should be smooth.
* The signal levels should be approximately between 3000 to 4000 counts.
* The blue and red lines should be similar in shape and within 500-1000 counts. If the levels differ by more than that, the gains of the VGA (variable gain amplifiers) might require adjustment.
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