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Diagram of an inverted-L antenna, a common wire antenna used with crystal radios. The antenna converts the energy in the electromagnetic radio waves to an alternating electric current in the antenna, which is connected to the tuning coil. Since, in a crystal radio, all the power comes from the antenna, it is important that the antenna collect ...
Several changes were made based on his suggestions. The receiver was redesigned and reissued as the SCR-54 (Set, Complete, Radio). Since there was high demand, several companies produced these sets or components, including DeForest Radio Telephone and Telegraph, Liberty Electric, Wireless Specialty Apparatus, Marconi, and General Radio .
A crystal set receiver consisting of an antenna, a variable inductor, a cat's whisker, and a filter capacitor. A crystal receiver is very simple and can be easy to make or even improvise, for example, the foxhole radio. However, the crystal radio needs a strong RF signal and a long antenna to operate.
The simplest crystal radio receiver, employing an antenna and a demodulating diode , is actually a rectenna, although it discards the DC component before sending the signal to the headphones. People living near strong radio transmitters would occasionally discover that with a long receiving antenna, they could get enough electric power to light ...
The simple statement is that crystal radios need good antennas because the power that drives the headphones comes from the antenna. The more power the antenna delivers, the better. A half-wave dipole is a good antenna, and it does not need a ground (but for practical reasons might need a balun). Over-the-air powered RFIDs can use dipole antennas.
English: Circuit of a "two-slider" crystal radio receiver, a popular circuit used in simple crystal radios made before 1920. To tune in different stations, it used a tuning coil (L1) with two sliding contacts on it. It doesn't use a tuning capacitor, instead the coil resonates with the capacitance of the long wire antenna to create a tuned circuit.
These weren't very efficient rectifiers in crystal radios, because the low voltage signal from the antenna had to overcome the device's forward voltage drop, and so was insufficient to drive the device far into its conduction region, so it had a large AC resistance.
The SCR-508 radio was a mobile Signal Corps Radio used by the U.S. Army during World War II, for short range ground communications.The SCR-508 series radio represented the Army's commitment to both FM and crystal tuning, and was used extensively by armor and mechanized units.
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