Sunday, December 16, 2012

Junk Bin Antenna Tuner

Threw together a junk bin L network antenna tuner. The inductor is wound with solid core 14 gauge wire. The variable capacitor was scrapped out of an old (non working and not worth anything) tube AM radio. The coax connectors were scrapped off a couple of junk CB radios.

The capacitance range isn't quite enough with the variable capacitor so I had to add capacitance by sticking a capacitor in parallel on the breadboard. I'm usually able to get the SWR down to 1.5 or less on the G5RV antenna and I use the FT-900's internal tuner to do the rest.

I plan to buy a couple of larger variable capacitors and make a finished T network version that will hopefully preform better but I was able to get on the air without having to spend a bunch of money!