Matching 75ohm antenna to 300ohm receiver
Interesting observation. The only thing that comes to mind is that since the mismatch is not so high (~2dB) hence balun this is not included. Maybe to save cost?
For Transmitter however, it would be important.
Open Dipole Antenna has approx. 300 Ohm Impedance but there is a Balun in the TV Connector
This is contrary to all known calculations and empirical evidence.
This IS true for a closed (folded) dipole.
Here is the deal. If your length of 300 ohm cable is short (less than 1/8 wavelength) it does not matter.
Only if you have a long transmission line is it a concern
Balanced to unbalanced conversion is more important than impedance matching. An unbalanced load can screw up a dipole?s performance something fierce
Are you sure it's a 300 ohm line? What is the wire diameter, and the wire spacing?
Good point. So in this particular case the antenna is obviously balanced and so is the cable. But that connector looks like an unbalanced 75ohm. There's probably a balun hidden inside that black end-plug
You should open it up and have a look-see