Crystal Radio 1920S. The 1.5” diameter coil and variable capacitor form a resonant circuit to select the frequency and a diode rectifies (demodulates) the modulated radio frequency carrier. A crystal radio is basically a high q resonator tied to an antenna and an envelope detector. These days the envelope detector is a point contact diode such as a 1n34. Even after the vacuum tube came into use, and modulated (voice and music) radio was perfected, many could not afford the expensive receivers. Demonstration by volunteer curator rod viveash of an early 1920s crystal radio set. The video shows a number of crystal radios from the 1920s and 1930s focussing in on the. Early crystal radios used a natural galena crystal instead of a germanium diode to detect the audio modulation. Crystal radios were quite popular and played an important role in communication from 1920s to 1940s. Crystal sets became widely used in the 1920's with their crystals, cat's whisker and point contact providing hours of amusement, and that before the broadcast station was picked up!
from fineartamerica.com
These days the envelope detector is a point contact diode such as a 1n34. The 1.5” diameter coil and variable capacitor form a resonant circuit to select the frequency and a diode rectifies (demodulates) the modulated radio frequency carrier. Early crystal radios used a natural galena crystal instead of a germanium diode to detect the audio modulation. Crystal sets became widely used in the 1920's with their crystals, cat's whisker and point contact providing hours of amusement, and that before the broadcast station was picked up! Demonstration by volunteer curator rod viveash of an early 1920s crystal radio set. A crystal radio is basically a high q resonator tied to an antenna and an envelope detector. The video shows a number of crystal radios from the 1920s and 1930s focussing in on the. Even after the vacuum tube came into use, and modulated (voice and music) radio was perfected, many could not afford the expensive receivers. Crystal radios were quite popular and played an important role in communication from 1920s to 1940s.
1920s Crystal Radio Sepia Photograph by Greg Hjellen Fine Art America
Crystal Radio 1920S Early crystal radios used a natural galena crystal instead of a germanium diode to detect the audio modulation. Early crystal radios used a natural galena crystal instead of a germanium diode to detect the audio modulation. A crystal radio is basically a high q resonator tied to an antenna and an envelope detector. The video shows a number of crystal radios from the 1920s and 1930s focussing in on the. Crystal radios were quite popular and played an important role in communication from 1920s to 1940s. Crystal sets became widely used in the 1920's with their crystals, cat's whisker and point contact providing hours of amusement, and that before the broadcast station was picked up! Demonstration by volunteer curator rod viveash of an early 1920s crystal radio set. These days the envelope detector is a point contact diode such as a 1n34. The 1.5” diameter coil and variable capacitor form a resonant circuit to select the frequency and a diode rectifies (demodulates) the modulated radio frequency carrier. Even after the vacuum tube came into use, and modulated (voice and music) radio was perfected, many could not afford the expensive receivers.
