NANOVNA
Analizzatore di rete vettoriale originale
NanoVNA 50KHz - 900MHz Digital Display Touch Screen onde corte MF HF VHF
UHF Antenna Analizzatore Onda stazionaria. (buy)
- Battery replacement NanoVNA-H with cell phone 3.8V LI-Ion 2100 mAh
- With this solution I can directly connect antennas with SO-239 and have exact calibration at the output of the SO connector.
When
you calibrate the NanoVNA with the supplied cable and you put the loads
(open-closed-50 ohm) you have calibrated the instrument. Then you have to put a reducer to connect the antenna cable, in my case I have RG213 drops with UHF PL-259 female connector. Before connecting the antenna cable, the NanoVNA changes the calibration as soon as the reducer is inserted. In this way I have calibrated antenna analyzer with all the reducer and thus I get exact measurement of the cable and antenna.
Installed and fully functional for NanoVNA another management sw "AntScope2 ver.1.1.1". Ability to see the results even offline.
- Download here
Tested with my NanoVNA as a spectrum analyzer. The
tests were done with a WSPR signal generator at the frequency of 14095
Khz and on two frequencies at 400600 Khz and 432500 Khz. It works, great for finding nuisance signals. 😕
- 14095 Khz
- 400600 Khz
- 432500 Khz
Comments
I didn't understood the purpose of the adapter used in that way.
If you want to include the adapter in the calibration path, you should use a commercial SMA male to SO239 female and use SO239 cal elements (short/open/load). Only in this way the load is seen AFTER the transition.
In the way that you proposed, the VNA sees the transition a small "open stub" and it may influence the calibration.
In my experience, if you use a commercial transition instead of home-made , the calibration doesn't change too much, especially in 0-30MHz.
Bests
Alfredo