Globalstar ST100 User Manual page 83

8545-0194-01 v1.0
10. Turn on the VNA, set the start frequency to 1GHz, end frequency to 3GHz, the measurement bandwidth as low as possible
(10kHz should be ok), the measurement is set to S11, the system impedance = 50 ohms, the format for the S11 response
is Smith Chart, and the RF power of the VNA is on. Add markers in the S11 response at 1615MHz and 1575.42MHz
11. Ensure the calibration kit you are using for the VNA is selected in the VNA software (and all the settings for the calibration
kit have been verified).
12. Ensure a RF coax cable (i.e. SMA cable) is connected to port 1 of the VNA and connect the other end of the SMA cable to
the calibration kit.
13. In the VNA software, perform a one-port calibration using the VNA calibration kit. You should do open, short, and load.
14. Once the calibration is done, connect the SMA cable from the VNA port 1 to the u.FL / SMA adapter that is connected to
the ST100 calibration PCB (if J2 is not installed, connect the RF coax cable to the semi-rigid RF coax soldered to the PCB)
15. In the VNA software, find the Port Extensions feature. Turn on Port Extensions, then perform a short circuit calibration.
In the VNA software, the 1575.42MHz and 1615MHz markers should be located on the far left side of the Smith Chart,
something similar as shown below.
ST100 User Manual v1 Confidential & Proprietary Information 76