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Calibration

This section is designed to explain the process for calibration filters.

1. Connect DDS I/Q to the spectrum analyzer using 20 dbm attenuator as safety. Set D-tacq in calibration mode, running the script radcelf_ini_cal.sh. Then adjust the output of DDS A and B to 5.5 dbm.

2. Check the output of Lo_distribution I/Q. You must connect a terminator in Lo-I2, Lo-Q2 and check signal in Lo-I1 and Lo-Q1.

3. Adjust the output of Lo-I and Lo-Q in the LO Backplane with the blue potentiometer. It should be -3.6 dbm.

4. You can check the signal I and Q on the receivers. The signal should have more or less the same amplitude in all antennas.

Use a scope probe, clip ground to any ground, and check the test point for signal. You should detect I and Q there.

5. For get the calibration values for the filters, first adjust the output of TX in Lo-distribution and connect it to the calibration box. Then connect the cables to CRX.

Do not connect more of -44dbm to CRX.

6. Get an acquisition of 1 minute, keep the dta file.

Use the code calibration_filer.m to get the calibration values. The script will generate a file with the values.