![]() 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. You can build professional-quality electronics equipment yourself, even with no experience.Brooke Clarke, N6GCE Military radios of that day, such as the US Army's BC-14/SCR-54, also used antenna tuning, light coupling between stages, a tuned diode section and they operated on the same range of frequencies, 550-1600 KHz. In many respects, this design operates on similar principles to the 'Trench Radios' of WW 1. My schematic diagram of the Heathkit model CR-1 crystal radio. Even though I kept some of the parts, I decided one day to buy another Futura and found one on. One day, someone borrowed the Futura and broke the case. Your story about the Heathkit CR-1 reminded me of the Futura 3 Transistor radio I got for Christmas that I used to listen to the Los Angeles Dodgers baseball games at night, using the earphone. Back then I mentioned that I was ‘eager to get my mitts on one’ and that I had arranged to borrow a CR-1 from another VE7 who was fortunate enough to own one. If you’re a regular blog reader, you will likely recall my description of “The Enigmatic Heathkit CR-1 Crystal Radio” a few weeks ago. ![]()
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