![]() ![]() The CR-1 has neither of these yet it performed exceptionally well during the few weeks of evening tests a few months ago. My previous experience with homebrew DX crystal radios (ones that can hear stations other than strong locals) had taught me that they required large coils and 'hot' diodes. The $7.95 even included a set of headphones! Of course, $7.95 to a 12 year old was probably a lot of money, being about $70 in today's currency! I do wish that I'd had enough sense when I was a kid to buy myself a CR-1 as it seemed like they were dirt-cheap. The coils have been pre-wound and fixed on the form, about 20mm apart while the slugs have been waxed in place to set each inductance to the desired value. one for the antenna coil and one for the detector coil. This very much sought-after radio is a well engineered ' double-tuned' set utilizing a series-tuned antenna tank circuit coupled to a parallel-tuned detector tank.īoth coils are wound on the same 1/4" diameter tubular form containing two ferrite slugs. Regular blog readers may recall my two previous blogs, on the Heathkit CR-1 crystal radio receiver.
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