A primitive foxhole radio only consists of an antenna, coil, diode and headphones. There doesn't seem to be an LC-resonator, so how does this radio tune in on a carrier frequency?
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It probably doesn't do so very well. All it really needed to do was to pick up the single radio station in range of the foxhole. Tuning wasn't really the strong point of such a radio. – JRE Apr 15 '17 at 20:40
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No tuning. Set up for (or close to) one frequency. Trial and error. – StainlessSteelRat Apr 15 '17 at 20:50
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The coil will have a certain amount of self-capacitance, which will be enough for resonance. The resonant frequency will be in the broadcast band if it has enough turns.
Leon Heller
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Thanks! Am I correct in assuming that the resonant frequency you describe is the same as the coil's self-resonant frequency described [here](http://www.analogictips.com/when-inductors-self-resonate/)? – Axel Boldt Apr 15 '17 at 22:21
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