Birmingham Alabama Crystal Radio Group Banner

Matching The Antenna

Many crystal sets use a variable capacitor in series with the antenna and the top of the antenna tank circuit (parallel coil/ capacitor) or between the ground and the antenna tank circuit. However, that is not the only way!

In the following pages we will look at some other approaches.

Lem's Antenna Matching Unit

Antenna matching

Front of the unit. Lem used a black plastic clipboard from WalMart for the front panel.

Antenna matching

Top view showing lots of FT114A-61 cores.

Antenna matching

Right view showing the variable traps and series connected 8:1 verniers for an effective ratio of 64:1.

Antenna matching

Click for large schematic view.