WHAT IS OSCILLATION?

Radio Record, Volume I, Issue 5, 19 August 1927, Page 3

WHAT IS OSCILLATION?

~ New Zealand cities are suffering from a plague of howling valves, lf a neutrodyne or Browning-Drake is not correctly neutralised when the yalyes oscillate howling and interference with neighbouring listeners will result, Unless controlled, oscillation will continue until the saturation point or climax is reached, the valve then being said to be in a state of oscillation. When a receiving set is in oscillation it causes howling and squealing in your own and your neighbour’s reccivying sets if you are using an incompletely neutralised set or a 3-coil set. Regeneration should tix’ ‘ore never be allowed to proceed this point, as it then constitutes a .ablic nuisance. On commercial receivers, regeneration is not always described by this /name, and the dial which controls this feature of the equipment may be designated by way of the following terms: Regeneration; reaction; tickler; feedback ; amplification; sensitivity. When a radio receiving set in a state of oscillation is being tuned to a broadcast station: 1-It causes whistles in radio receiying sets of all types which are tuned to the same station, This interference may be heard up to a distance of sever- al miles. ‘ 2-It distorts the quality of your own music. 3-It uses more *B’" battery power and therefore the life of the "B" battery power is reduced, . . 4-It tends to reduce the of the detector tube. . When a radio receiving set, in a state of oscillation, is exactly tuned to a broadcast station it is said to be in the state of zero beat, This distorts the broadcast reception and also interferes with the neighbouring receiving sets which are tuned to the same station. . . In a word, to oscillation causes great annoyance to your neighbours, as well as poor recep. . tion and expense to yourself, and has no advantages whatever,