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- Neutrodyne abstract "The Neutrodyne was a particular type of tuned radio frequency (TRF) radio receiver, in which the instability-causing inter-electrode capacitance of the triode RF tubes is cancelled out or "neutralized". In most designs, a small extra winding on each of the RF amplifiers' tuned anode coils was used to generate a small antiphase signal, which could be adjusted by special variable trim capacitors to cancel out the stray signal coupled to the grid via plate-to-grid capacitance.The circuit was developed in the early 1920s by Harold Wheeler who worked in Louis Hazeltine's lab at Stevens Institute of Technology, so Hazeltine is usually given the credit. Hazeltine's invention effectively neutralized the high-pitched squeals that had plagued early radio sets. A group of more than 20 firms known as the Independent Radio Manufacturers Association licensed the circuit from Hazeltine and manufactured "Neutrodyne" receivers throughout the 1920s. At the time, RCA held a virtual monopoly over commercial radio receiver production due to its ownership of the rights to the Armstrong regenerative and superheterodyne circuits. The Neutrodyne broke this stranglehold, allowing competition in the radio market. Compared to the technically superior Superheterodyne the Neutrodyne was cheaper to build. Also, as basically a TRF receiver, it was also considered easier for non-technical owners to use than the early superhets. After manufacture each tuned amplifier stage had to be neutralized, adjusted to cancel feedback; after this the set would not produce the parasitic oscillations which caused the objectionable noises. By 1927 some ten million of these receivers had been sold to consumers in North America.By the 1930s, advances in vacuum tube manufacturing had yielded the tetrode, which had reduced control grid to plate (Miller) capacitance. These advances made it possible to build TRF receivers that did not need neutralization, but also made Edwin Armstrong's superheterodyne design practical for domestic receivers. So the TRF circuit, including the Neutrodyne, became obsolete in radio receivers and was superseded by the superheterodyne design. The Neutrodyne neutralization technique continues to be used in other applications to suppress parasitic oscillation, such as in RF power amplifiers in radio transmitters.".
- Neutrodyne thumbnail First_neutrodyne_radio_receiver.jpg?width=300.
- Neutrodyne wikiPageExternalLink 03_2004.html.
- Neutrodyne wikiPageExternalLink lookaround_techspot.html.
- Neutrodyne wikiPageExternalLink neutral.htm.
- Neutrodyne wikiPageID "2991563".
- Neutrodyne wikiPageRevisionID "600435324".
- Neutrodyne align "center".
- Neutrodyne caption "Modified Neutrodyne circuit in which the feedback is taken from the secondary of T2 instead of the primary.".
- Neutrodyne caption "Original Neutrodyne circuit. CN applies a second feedback signal to the grid which is 180° out of phase with the first, canceling it, to prevent oscillations. The signal is taken from an opposite phase winding on the interstage coupling transformer T2.".
- Neutrodyne caption "Tuned RF amplifier stage used in TRF receivers. Cgp, the internal capacitance between grid and plate in the tube, creates a positive feedback path from output to input which can cause the stage to oscillate, producing noises in the loudspeaker.".
- Neutrodyne direction "horizontal".
- Neutrodyne hasPhotoCollection Neutrodyne.
- Neutrodyne image "Neutrodyne circuit - modified.png".
- Neutrodyne image "Neutrodyne circuit.png".
- Neutrodyne image "Tuned RF amplifier stage.png".
- Neutrodyne width "222".
- Neutrodyne width "224".
- Neutrodyne width "234".
- Neutrodyne subject Category:History_of_radio.
- Neutrodyne subject Category:Radio_electronics.
- Neutrodyne subject Category:Receiver_(radio).
- Neutrodyne comment "The Neutrodyne was a particular type of tuned radio frequency (TRF) radio receiver, in which the instability-causing inter-electrode capacitance of the triode RF tubes is cancelled out or "neutralized".".
- Neutrodyne label "Neutrodyne".
- Neutrodyne label "Нейтродин".
- Neutrodyne sameAs m.08j65c.
- Neutrodyne sameAs Q6739971.
- Neutrodyne sameAs Q6739971.
- Neutrodyne wasDerivedFrom Neutrodyne?oldid=600435324.
- Neutrodyne depiction First_neutrodyne_radio_receiver.jpg.
- Neutrodyne isPrimaryTopicOf Neutrodyne.