So here's my problem. I'm about to buy an fm transmitter. 1st what does the balun do? 2nd I have a dipole antenna from an old TV that has an in-built balun inside. Only problem is that the balun is 1:4 (75ohm-300ohm). From what i know a coaxial cable is 50 ohm and a dipole antenna is also 50ohm.a twin lead cable is what goes from transformer to antenna. I read it was 300ohm so therefore the 300ohm resistors in the circuit...... Is this how i must leave it or must i build 1:1 balun. If so, how?
