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Hi-Fi AM Radio.
"Steven Swift" wrote in message ... rar+p and rats: Okay, here's the answer directly from the Radiotron Designer's Handbook, fourth edition, pages 1226 and 1227: "Section 3: The Synchrodyne" [...] "and hence the synchrodyne is likely to be most popular for high-quality local-station reception." I think the fact that the synchrodyne never became at all popular as an AM radio detector in the tube era means something. If I recall correctly, I read that synchrodyne detectors would howl until they sync'd. Also, the phasing would have to be perfect to get good demodulation from normal double sideband AM. There you have it. Are we done. This is a 3-tube design for local stations. One RF amp, 2 12au7s. Use an IC or two in the oscillator loop and its perfect, almost a Costas Loop. Build it; they will come. Steve. I suppose it's something worth experimenting with, but diode detectors aren't bad. Even in the solid state era, sync detectors aren't particularly popular. The add on sync detectors are expensive. It still doesn't seem to be easy. Frank Dresser |
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