![]() There's a small amount of interaction between the antenna circuit and the tank, but not a lot. The best way to tune is first set the tank where the station will be then peak the antenna circuit. With a 100 foot long wire this receiver picked up all the AM broadcast stations you would hear on a regular table radio. Uses a 1N34 diode and hi impedance (old) headphones. ![]() The tank is composed of the three section air variable cap and the other part of the standing coil. The antenna circuit has a coil that couples to the tank circuit, but there's no metallic connection between the antenna circuit and the tank circuit. The antenna and ground (must have a good ground) are connected on the back. The idea is to resonate the external antenna. A clip lead not in the photo is used to connect to one of the taps. The antenna circuit consists of the range switch on the left, the tapped coil (horizontal over red earphone binding posts) and the two section air variable cap on the left. The cardboard box has suffered from both the time and having stuff on top crush it. This was during a time when I was spending a lot of time with the Boonton 160 Q meter and making a number of coils. ![]() This radio was made in the late 1960s or early 1970s.
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