Hi all, absolute noob here, I have 3 Tbeams on the slow boat from China, after weeks of rummaging around I realised I need to learn how Antennas work and how to make and tune them, I purchases a Nano VNA, got it today and have been applying all the knowledge I learnt and feeling my way around the device.
I was able to do a test and it was pretty accurate, please note the Load cap is 51 ohms I don’t don’t know if that will affect the quality of tuning
I am using the time to learn how to use the VNA until the TBeams get here.
I am open to pointers and suggestions, I will also be making a few antennas and posting them here
In your NanoVNA it looks like you are measuring a coaxial cable and not an antenna.
Maybe I’m wrong but I think you have to calibrate your VNA for the frequency between 300MHz to 500Mhz. otherwise it marks wrong values
The rtlsdr dipole antenna has a 100K resistor to bleed off static. It is not made for transmitting and could damage your output stage if you connect it to your board.
And you should calibrate every time you change frequency… not just on power up.
What if I remove the resistor? Also I never planned to use this as an antenna, my initial plan was to use to to practice with the VNA, also removed the pols made some 1090mhz (ADSB) antennas from wire… I was amazed how we’ll it worked.
