WIRELESS INVENTIONS

Evening Post, Volume CIX, Issue 119, 22 May 1930, Page 24

WIRELESS INVENTIONS

Badio inventors have not finished their work. During the last year more than 1000 applications for patents on improvements were filed in the U.S.A. Patent Office, and more than 500 patents were issued. Inventors have sought to provide means, especially in connection with refinements in the use of the Piezo-olectric crystal to keep the frequencies at tho broadcasting stations more nearly constant, so that different stations can approachi more closely to one another's frequency without interference, to the end that more stations may broadcast simultaneously. Efforts have been directed, and with a fair.degree of success, to getting rid of the '' hum" in the power tube of the receiving set, Where the energy for the set is supplied from the lighting current source in the home. Inventors are still seeking a clearer reproduction in the loud speaker; also the further elimination of so-called "fading." Static has been the subject of much study, especially along.the lines of neutralisation of such disturbances, and particularly if they have no constant frequency, by arrangements for tuning them out, or by splitting their energy and making each portion destroy the other.

Some effort has been made by inventors, but so far with indifferent success, to eliminate the effects of absorption of the cuergy of. the radiating waves by the metal framework of very tall buildings in the cities. Some in-teresting-work has been done by inventors in connection with what' is termed "wired wireless" or wire-guided electric wave transmission of intelligence. Many refinements are so ingenious sis to partake of the nature of inventions. While an up-to-date receiving set of a year ago seemed almost all that could be desired, manufacturers, following in the wake of inventors, are able to offer to-day better sets than ever before, and the end of the inventor's work is not yet.