File:First vacuum tube AM radio transmitter.jpg
Summary
Apparently the first commercial AM <a href="https://en.wikipedia.org/wiki/Audion" class="extiw" title="en:Audion">Audion</a> <a href="https://en.wikipedia.org/wiki/vacuum_tube" class="extiw" title="en:vacuum tube">vacuum tube</a> <a href="https://en.wikipedia.org/wiki/transmitter" class="extiw" title="en:transmitter">radio transmitter</a>, built in 1914 by <a href="https://en.wikipedia.org/wiki/Lee_De_Forest" class="extiw" title="en:Lee De Forest">Lee De Forest</a> who invented the Audion (<a href="https://en.wikipedia.org/wiki/triode" class="extiw" title="en:triode">triode</a>) in 1906, from a short announcement in Electrical World magazine. It was not the first AM (sound) transmitter; short-lived technologies like the <a href="https://en.wikipedia.org/wiki/Poulsen_arc" class="extiw" title="en:Poulsen arc">Poulsen arc</a> and <a href="https://en.wikipedia.org/wiki/Alexanderson_alternator" class="extiw" title="en:Alexanderson alternator">Alexanderson alternator|</a> had been transmitting sound since 1906. But the vacuum tube <a href="https://en.wikipedia.org/wiki/electronic_oscillator" class="extiw" title="en:electronic oscillator">feedback oscillator</a>, invented in 1912 by Edwin Armstrong, replaced them, and has remained the key technology used in radio transmitters to the present day.
Licensing
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 16:02, 3 January 2017 | | 448 × 360 (45 KB) | 127.0.0.1 (talk) | Apparently the first commercial AM <a href="https://en.wikipedia.org/wiki/Audion" class="extiw" title="en:Audion">Audion</a> <a href="https://en.wikipedia.org/wiki/vacuum_tube" class="extiw" title="en:vacuum tube">vacuum tube</a> <a href="https://en.wikipedia.org/wiki/transmitter" class="extiw" title="en:transmitter">radio transmitter</a>, built in 1914 by <a href="https://en.wikipedia.org/wiki/Lee_De_Forest" class="extiw" title="en:Lee De Forest">Lee De Forest</a> who invented the Audion (<a href="https://en.wikipedia.org/wiki/triode" class="extiw" title="en:triode">triode</a>) in 1906, from a short announcement in <i>Electrical World</i> magazine. It was not the first AM (sound) transmitter; short-lived technologies like the <a href="https://en.wikipedia.org/wiki/Poulsen_arc" class="extiw" title="en:Poulsen arc">Poulsen arc</a> and <a href="https://en.wikipedia.org/wiki/Alexanderson_alternator" class="extiw" title="en:Alexanderson alternator">Alexanderson alternator|</a> had been transmitting sound since 1906. But the vacuum tube <a href="https://en.wikipedia.org/wiki/electronic_oscillator" class="extiw" title="en:electronic oscillator">feedback oscillator</a>, invented in 1912 by Edwin Armstrong, replaced them, and has remained the key technology used in radio transmitters to the present day. |
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