Heathkit AC-1 Antenna Coupler

 Shielded unit featuring a copper plated chassis and shield compartment.

 Coaxial 52 ohm receptacle on the rear of the chassis connects to a three section Pi-type low pass filter with a cutoff frequency of 36 Mc.

 Tuning network consists of a variable capacitance and tapped inductance in an impedance matching unit.

 Capacity coupled neon lamp serves as a tuning indicator and will also provide a rough indication of power output.