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A family listening to a crystal radio in the 1920s Greenleaf Whittier Pickard's US Patent 836,531 "Means for receiving intelligence communicated by electric waves" diagram US Bureau of Standards 1922 Circular 120 "A simple homemade radio receiving outfit" taught Americans how to build a crystal 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.
Homebrew is an amateur radio slang term for home-built, noncommercial radio equipment. [1] Design and construction of equipment from first principles is valued by amateur radio hobbyists, known as "hams", for educational value, and to allow experimentation and development of techniques or levels of performance not readily available as commercial products.
English: Circuit of the simplest possible crystal radio receiver. Circuits of this type were used in the first experimental crystal radio receivers in the pioneering days of radio, just after 1900. It consists of a crystal detector (semiconductor diode) DI connected between a long wire antenna and ground, with a sensitive earphone E1 attached ...
Crystal radio receivers are a very simple kind of batteryless radio receiver. They do not need a battery or power source, except for the power that they receive from radio waves using their long outdoor wire antenna. Sharp Electronics' first electrical product was a batteryless crystal radio introduced in 1925.
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 ...
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.
A simple crystal radio with no tuned circuit can be used to listen to strong AM broadcast signals. An early form of envelope detector was the crystal detector, which was used in the crystal set radio receiver. A later version using a crystal diode is still used in crystal radio sets today.
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