| 11. | These units were equipped with " Veeps " : jeeps having Very High Frequency SCR-193 crystal sets.
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| 12. | The foxhole radio is like a crystal set, in that it does not require an external power source.
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| 13. | Traditional crystal sets use half-wave rectifiers.
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| 14. | The first crystal sets received wireless telegraphy signals broadcast by spark-gap transmitters at frequencies as low as 20 kHz.
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| 15. | Early radio listeners, often using home made crystal sets and long wire antennas, found radio stations few and far between.
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| 16. | In recent years, the number of such believers has swollen, spilling from the Birkenstock-and-crystal set into the culture at large.
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| 17. | Some crystal set users added a carbon amplifier or a mechanical turntable amplifier to give enough output to operate a speaker.
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| 18. | This later gave way to the famous and more sensitive galena crystal sets . spark coil from Ford Model T automobiles.
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| 19. | It was used in the earliest days of radio, when only one or two stations were within a crystal set's limited range.
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| 20. | The early earphones used with wireless-era crystal sets had impedance, often 75 ?, and required more current than a crystal radio could supply.
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