. Radio for everybody; being a popular guide to practical radio-phone reception and transmission and to the dot-and-dash reception and transmission of the radio telegraph, for the layman who wants to apply radio for his pleasure and profit without going into the special theories and the intricacies of the art . is a duplex system: one message maybe sent in each direction simultaneously. For transmit-ting, a fair-sized aerial is employed, while for receivinga loop antenna is used at each end. These loops are ofthe solenoidal or helical type, six feet square, and consistof only four or five turn
. Radio for everybody; being a popular guide to practical radio-phone reception and transmission and to the dot-and-dash reception and transmission of the radio telegraph, for the layman who wants to apply radio for his pleasure and profit without going into the special theories and the intricacies of the art . is a duplex system: one message maybe sent in each direction simultaneously. For transmit-ting, a fair-sized aerial is employed, while for receivinga loop antenna is used at each end. These loops are ofthe solenoidal or helical type, six feet square, and consistof only four or five turns each. To make the duplexoperation a success, it goes almost without saying thatexceptional measures had to be taken, otherwise the trans-mitter at one end would drown out the incoming signalson the loop antenna but a short distance away. The elimi-nation of such interference was attained by the use ofdifferent carrier frequencies for transmission in the twodirections. Great things can be expected of the radio link. Whereasit would otherwise be necessary for a person, desiringto telephone by wireless, to have a radio telephone trans-mitter of his own or to visit a radio telephone station, itnow becomes possible to employ a distant radio telephonetransmitter through any Bell system telephone. It is only. 58 RADIO FOR EVERYBODY a matter of time when we shall talk over our telephonelines to our friends at sea, thanks to the radio link,although this service will always of necessity be expensive. How Radio-Phone Broadcasting Came About But the average reader of this book will no doubt bemore interested in the radio-phone broadcasting develop-ment, which is a later-day phase. Before this broadcast-ing service became a regular thing, there were spasmodicefforts to send out musical programs, made by severalradio companies, but these were intended rather as teststhan as entertainment for tens of thousands of present form of radio-phone broadcasting dates backto the latter
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