SHARPER TUNING

Radio Record, Volume I, Issue 11, 30 September 1927, Page 4

SHARPER TUNING

BY BROADCAST STATIONS. Mr. &. G. Beard, the well-known ‘Sydney radio engineer, in the course of a newspaper controversy, writes: "Tt would give me great pleasure to exe plain how broadcast station sidebands can be reduced, and how it has been done at Rugby and 2GB, Sydney, and why it cannot be done continuously at Australian broadcasting stations until the present regulations are altered, due to the loss of power entailed and not permitted to be used. Also, I may be able to explain, with the aid of quotations from various alleged experts in other parts of the world, why the unmodulated carrier wave of a broadcast. ing station may possess a large decre« ment, and so render its tuning broad. (At a later time, this could be demon strated. at one of the Sydney broad casting stations.) If any time is then available, I will then show how the magnitude of the sidehands is abso lutely independent of the depths of modulation, and only depends on the modulating freqnency.’* '