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The entire wiki reimagined as a visual magazine with video discovery · Watch your interests come alive
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National Association of Educational Broadcasters
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The National Association of Educational Broadcasters was a US organization of broadcasters with aims to share or coordinate educational programmes. It was founded as the Association of college and Uni
1960's reel-to-reel magnetic tape player
1960's reel-to-reel magnetic tape player
Amplitude modulation
Videos
Amplitude modulation is a signal modulation technique used in electronic communication, most commonly for transmitting messages with a radio wave. In amplitude modulation, the instantaneous amplitude
National Association of Educational Broadcasters
…1945, the FCC reserved five of the 40 channels in new high-frequency band for Non-commercial educational stations. There were initially planned to be AM services; however, they eventually manifested as FM ones. NAEB's station members began an ad hoc tape exchange network in the fall of 1949. The director…
One of the crude pre-vacuum tube AM transmitters, a Telefunken arc transmitter from 1906. The carrier wave is generated by 6 electric arcs in the vert
One of the crude pre-vacuum tube AM transmitters, a Telefunken arc transmitter from 1906. The carrier wave is generated by 6 electric arcs in the vertical tubes, connected to a tuned circuit. Modulation is done by the large carbon microphone (cone shape) in the antenna lead.
One of the first vacuum tube AM radio transmitters, built by Meissner in 1913 with an early triode tube by Robert von Lieben. He used it in a historic
One of the first vacuum tube AM radio transmitters, built by Meissner in 1913 with an early triode tube by Robert von Lieben. He used it in a historic 36 km (22 mi) voice transmission from Berlin to Nauen, Germany. Compare its small size with the arc transmitter above.
Figure 3: The spectrogram of an AM voice broadcast shows the two sidebands (green) on either side of the carrier (red) with time proceeding in the ver
Figure 3: The spectrogram of an AM voice broadcast shows the two sidebands (green) on either side of the carrier (red) with time proceeding in the vertical direction.