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Armstrong won the first case, lost the second, stalemated at the third, and then lost the final round at the Supreme Court. [32] [33] At the time the regenerative receiver was introduced, vacuum tubes were expensive and consumed much power, with the added expense and encumbrance of heavy batteries. So this design, getting most gain out of one ...
There was an optional vacuum tube detector, type DT-3-A, available for the SCR-54. It used a VT-1 vacuum tube powered by a BA-2 battery. The type number was originally SCR-55, later changed to DT-3, then DT-3-A. The crystal proved more popular in field use. [3]
By 1912, vacuum tube operation was understood, and regenerative circuits using high-vacuum tubes were appreciated. While growing up, Armstrong had experimented with the early temperamental, "gassy" Audions. Spurred by the later discoveries, he developed a keen interest in gaining a detailed scientific understanding of how vacuum tubes worked ...
The non-linear characteristic of the transistor or tube also demodulated the RF signal to produce the audio signal. The circuit diagram shown is a modern implementation, using a field-effect transistor as the amplifying element. Armstrong's original design used a triode vacuum tube. Meissner oscillator schematic, original 1913 vacuum tube version
A high vacuum tube needs a gridleak resistor parallel to the gridleak capacitor. In Fig. 3, the LC circuit L and C select the receiver frequency. C2 is the gridleak capacitor and helps to demodulate the received signal. B1 is the A-battery or heater battery and B2 is the B-battery or anode battery. In Fig. 8, L, C, B1 and B2 are as in Fig. 3.
Vacuum tube transmitter "Glowbugs" are a related aspect of vintage radio and harken back to the early days of amateur radio, when the majority of hams hand-crafted their own equipment. Smaller in size than "boat anchors", "glowbug" is a term used by US amateurs to describe a simple home-made tube-type radio set.
English: Single vacuum tube Armstrong regenerative receiver circuit, invented in 1913 by American engineer Edwin Armstrong when he was a 22 year old college student. It was widely used until the 1930s when it was replaced by TRF and superheterodyne receivers. In the regenerative receiver, the gain of the tube is increased by feeding back some ...
A 5-tube superheterodyne receiver manufactured by Toshiba circa 1955 Superheterodyne transistor radio circuit circa 1975. A superheterodyne receiver, often shortened to superhet, is a type of radio receiver that uses frequency mixing to convert a received signal to a fixed intermediate frequency (IF) which can be more conveniently processed than the original carrier frequency.
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