just how good could an unmodified CR-1’s simple double-tuned design really be? I was about to find out. Crystal radio design is always a trade-off between these two critical characteristics.Īlthough I had heard good things about the CR-1, I must admit that I was somewhat skeptical. Reducing the load on the tank circuit improves selectivity but diminishes sensitivity. The detector diode, a 50’s-era 1N34, is tapped down on the tank for headphone impedance-matching and to reduce circuit loading. and are somewhat pricey!Īs can be seen in the schematic diagram above, the CR-1 is a simple double-tuned crystal receiver, utilizing a series-tuned tank circuit for antenna-tuning, coupled into the detector tank circuit. ![]() I am most appreciative of this kind gesture from a fellow radio amateur, knowing that these things are not too easy to find. He was happy to pass it on knowing that it was going to a good home.
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