![]() ![]() I filled the cavity with silver solder (melting point 450 deg. I will make a better stand after the circuit design "firms up" a bit. There is still backlash in the ball and shaft. I used a pair of dikes to mangle the threads enough to make a tight fit and good electrical connection. The threads were originally very loose and intermittently resistive. Its design is not the best the shaft is threaded through the ball. The building instructions were contradictory in places and the schematic diagram depicted components which could only be built by Lewis Carroll (the antenna coil has ten taps, but the coil switch is numbered 0 through 10). The article featured a loose-coupled unit with a single tank circuit. (with apologies to Lewis Carroll) Fit the First: Construction of the Original Design. Out came the plans and I began to build the beast. The article went on the "to-do" stack and there it languished until last year when I struck The Crystal Set Society on the Internet. In 1986 I was reading a copy of Radio Electronics magazine and found plans for an "Old-Time Crystal Radio". Alas, I found out that most hams are appliance operators they buy all their equipment. I built a transmitter and transmatch and bought a surplus BC312. My brother helped me with the construction and I spent many nights tuning in the world on the shortwave bands. There were no coils to tinker with, just knobs. No crystal radio, this it was a Knight Space Spanner and a pair of headphones. I made my wishes known and at Christmas, I received a box of plans and parts. All those coil taps, capacitors, and catwhiskers to tinker with! (His father was renowned for having built the first radio in the township, sometime before 1920.) They installed the crystal radio near the boy's bed so he could listen at night without disturbing the rest of the family. His father helped him build it and get it working. In the summer of 1957 one of my cousins received a crystal set kit for his birthday. Mark's set Mark's set Photo and Text information The Spider Set IIÄ¢001 Crystal Radio Building Contest Entry ![]()
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