Show sets work raj miracle iracle with small of power the en iriv M Ss sg of tho the ordinary receiving set of fir today Is a maracle of radio energy its effle leacy compared alth that oti oti ti the lie broadcasting transmitter affords probably the most striking contrast in radio engineering commissioner cald cala 1 1 well la in charge of technical a advances vances for the radio board says an eight hundred millionth ot of a watt a power so faint as to bo be bt be yond lie the gra grasp p of the mind Is sufficient energy to operate an ordinary receiving set mr caldwell lias has figured ue he says the power taken by an electric iron would operate such sets the ordinary set will receive fair programs with a signal intensity of 60 50 per meter assuming nn an antenna height of five meters giving available potential and as aming an antenna resistance of 50 ohms ohma ohms law shows that the tha primary energy received out of tho the ether ethe by the set would be e one eight hundred millionth of one watt tills this tiny power Is however a perfect abrl fabric of all the complex frequencies quen cies cles tones and shades of the orchestra clie or quartette it carries anti and when amplified produces produce i the rich and compelling sound pictures we know ro fo well and beitin even this amplified energy in ll 11 the e loud speaker Is small us as power goes registering less than one watt on dis other hand band the average broadcast transmitter requires a guard area surrounding jt it at wast least times a or large as its dependable ice area and probably less than 1 loosli of 1 per cent radiated energy Is received usefully by nil all the radio seta in its range mr caldwell says ne ile declares it Is doubtful it if even a watt station actually delivers a cotal total of buo ouo on watt to its audience the ether watts are wasted in since space metal structures structure sand and earth deposits |