| Electrical Communication is a free textbook on the basics of communication technology. See the editorial for more information.... |
|
Home  Electronic Applications in Communication Oscillators Positive-Grid Oscillators |
|
 Search the VIAS Library | Index
|
  |
Positive-Grid OscillatorsIn certain oscillators for ultrahigh and superhigh frequencies, special triodes are used with the grids positive and the plates negative. Some of the electrons emitted by the cathode and attracted toward the positive grid do not strike the grid wires but pass between them and travel on toward the plate. The negative plate repels these electrons, and they travel back toward the positive grid, where some of them strike grid wires and some pass between and travel toward the cathode. Here again they are repelled and once again travel toward the positive grid. These oscillations by some of the electrons between the electrodes induce voltages of extremely high frequency in the electrodes. The frequency is controlled by the electrode voltages. Such devices are called Barkhausen oscillators. When arrangements are made to control the oscillations with short transmission lines they are called Gill-Morell oscillators.
|
|
| Home Electronic Applications in Communication Oscillators Positive-Grid Oscillators |
|
Last Update: 2011-05-30