Radio Round the World

Radio Record, Volume IV, Issue 32, 20 February 1931, Unnumbered Page

Radio Round the World

‘HE highest broadcasting station in the world is that of.La Paz, Bolivia, 10,500 feet above sea-level. Ser ok Tis probable that the American Federal Radio Commission will permit the remainder of the twenty cleared channels designated for high power to be filled by stations selected from those applying to use 50 k.w. power. American DX-ing will be a simple | business shortly: . 2 ; * _* . ee MBPRICAN radio salesmen are noth-~ ing if not: ingenious. One recently advertised :-"Moving to the country; will‘ exchange electric radio for a battery set." What he wanted to know was the names and addresses of people who desired to have up-to-date receivers! "oe * HE Italian authorities are making strenuous efforts to suppress unlicensed receivers and transmitters, Not only have the police the right to search private dwellings if they suspect that they harbour unlicénsed receivers, but it is stated that a wireless dealer may not even sell a battery to a customer unless he can -produce his listener’s license. Co. * a . = (TELEVISION experimenters in An erica are to be allotted the ultrashort wave-lengths for their experiments. It is understood that the Fedcral Radio Commission is consenting to the allocation of 6.97 metres to the Milwaukee Journal, which has already experimented with 18 metres, and intends to discover whether still shorter Waves are not more suitable for. television. s *s * ADIO principles are being ‘applied as aids to the hard ‘of ‘hearing through the use of sound waves pitched _ so high as to be inaudible to--persons ° with normal ears. Heretofore most appliances to aid the partly deaf. have depended on some form of sound, amplification. Research ,enginecrs, kowever, observed that the hard of hear\ag seemed to hear much better on bry street corners, or in other places where there was a constant noise or roar. They decided this was due to the fact that this noise kept the ear-drums in vibration and that the vibrating drums were more sensitive to sound than when when set in motion from a state of rest. In order not to annoy normal persons, a method was developed for sending out sound waves of a frequency beyond the range of the ear. These waves are not heard, but keep the ear-drums vibrating, thus making it easier for the partly deaf to pick is used to create the inaudible pite and a reed operated by compressed" air to supply: body or volume and frequency. up audible sounds. A radio ible