Joined: 17 Oct 2015
|Posted: Sat Oct 17, 2015 8:40 am Post subject: Antenna matching for CAR antenna vs FM USB stick
I've done a lot of research the past few days on antenna matching, all the techniques ...
I ve come to the conclusion that I done have the technical background and devices to do that properly.
I want to use the original FM antenna of my 10years old car (1 wire high Z antenna with the car body as ground) to receive FM radio with a USB stick based on realtek rtl2832 & R820T tuner.
It is working quite well if I keep the central pin of the coax 1mm away and sudenly a lot of loss in SNR when it is connected.
My guess is the need to put a coil and to a UNUN to match 50ohm input of the R820T ?
I have no idea of the Z of the car antenna ...
Could you help me ?