2.1.8. Vector network analyzer¶
18.104.22.168. What do I need before I start?¶
VNA application requirements:
- Personal computer (PC) running Windows or Linux.
The following accessories and materials that are available in Red Pitaya store:
- any kit that includes STEMlab 125-14 or 125-10 board
- Vector network analyzer bridge module
22.214.171.124. Start using STEMlab as vector network analyzer¶
126.96.36.199.1. Connect vector network analyzer bridge to STEMlab¶
- connect OUT of VNA module to STEMlab IN1
- connect IN of VNA module to STEMlab OUT1
- set IN1 jumpers on STEMlab to LV position
Coming soon: image that shows connections (trenutno vna bridge module connections.png).
188.8.131.52.2. Install & run network vector analyzer control app¶
184.108.40.206.3. Type in the IP or URL address of the STEMlab board¶
220.127.116.11.3.1. Connect by entering STEMlab IP:¶
To find our IP address of the STEMlab board first connect to STEMlab by following this instructions.
Then go to System->Network manager. IP is written next to label Address: xxx.xxx.xxx.xxx .
18.104.22.168.3.2. Connect by entering STEMlab URL:¶
22.214.171.124.4. Run vector network analyzer application on STEMlab.¶
126.96.36.199.5. Click Connect inside network vector analyzer control app.¶
188.8.131.52. Perform calibration and start measuring¶
) Connect SMA OPEN calibration connector marked with letter O to DUT SMA connector of the network vector analyzer bridge module. Click button “Open” and wait for calibration procedure to complete.
) Connect SMA SHORT calibration connector marked with letter S to DUT SMA connector of the network vector analyzer bridge module. Click button “Short” and wait for calibration procedure to complete.
) Connect SMA LOAD calibration connector marked with letter L to DUT SMA connector of the network vector analyzer bridge module. Click button “Load” and wait for calibration procedure to complete.
) Select Smith chart tab at the bottom and then click Single button to perform a single measurement of the DUT. Dot in the middle of the Smith chart circle (@ 50ohm) will indicate that VNA is properly measuring reference 50ohm LOAD.
) Disconnect LOAD SMA connector and connect whatever DUT you’d like to measure.
- ) Measurement of 21m vertical antenna.
Antenna is not well tuned (at freq. 14, 21MHz SWR should be <= 1.5)
- ) HAM RADIO 20m band bandpass filter
SWR is better than 1.5 between start and stop band frequency. Filter load is around 50ohm between start and stop band frequency.