RadioBanter - Hey Antenna Gurus !

2:1 RF transformers can be a tricky item to build. IF you use air core
you need sufficient inductance in both the primary and and secondary.
Our amatuer radio club did a 40 M and 80 M full wave loop for Field
Day about 20 yrs ago and used air core RF transformers. They were
rather large and the windings required support. They worked very well.
We were making contacts when otheres were complaining how poor the
bands were.

Good luck on which direction you choose.

ps. If you plan to add a reflector to the system then I would suggest
other methods of matching than a balun or RF transformer. With a
reflector, a gamma match would be suitable. So temper that with your
decision for future expansion.

james

If I hook it up without a balun, I would get a 2:1 SWR. I guess I can lower it
slightly to 1.5 to 1.7 with someof that 75 ohm coax. I only use the center
conductor when using that method?

Vinnie S.