Class Information
Number: 331/92
Name: Oscillators > Retarding field tube-type oscillators (e.g., barkhausen kurz)
Description: Subject matter wherein the oscillator comprises an electron tube having at least three electrodes, i.e., a source of electrons (cathode), control electrode (grid) and an anode or plate electrode, the control electrode being biased positively with respect to the other electrodes. The bias potentials of the electrodes are so chosen that the electrons attracted from the cathode by the positive grid pass through the grid and are slowed down by the repelling effect of the negative anode field and are returned back to, or through the grid. This phenomenon is repeated again and again so that a cloud of electrons is caused to sweep back and forth through the grid, giving up energy to the grid at a frequency which is a function of the transit time of the electrons. Usually a frequency determining network is associated with the electron tube so that the frequency of the generated oscillation is a function of both the electron transit time and the network parameters.
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