. 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 . lled at theNaval Radio Stations at San Diego and Englewood, Cali-fornia, have given rise to some trouble. If the arc har-monic beats with the radio carrier and side frequencies ofthe radio telephone station at either an audible or nearlyaudible rate, the quality of the speech over the c
. 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 . lled at theNaval Radio Stations at San Diego and Englewood, Cali-fornia, have given rise to some trouble. If the arc har-monic beats with the radio carrier and side frequencies ofthe radio telephone station at either an audible or nearlyaudible rate, the quality of the speech over the circuitmay be affected materially. This is in effect the sameresult which obtains when speech signals are received onan ordinary heterodyne receiver when the local oscillatoris not adjusted to the same frequency as that of the trans-mitter. Although this trouble can be eliminated as soonas it is discovered by shifting the carrier frequency of theradio telephone transmitter a few thousand cycles, it isobvious that in the future, when many stations may beexpected to be operating, this difficulty must be eliminatedin a more elaborate manner. The radio link also provides for a full duplex radio tele-graph circuit, capable of sending and receiving messagesin two directions at the same time. Ordinary telegraph. Special form of switchboard and radio controls for connectingthe radio link with the regular telephone system. 318 RADIO FOR EVERYBODY instruments are used at the terminals and ordinary tele-graph lines lead to the radio installation. This duplextelegraph service operates simultaneously with the radiotelephone with no interference whatsoever. The Radio Links at Sea The day is not far distant when every passengersteamer at sea will be just as much within reach of theregular telephone system and just as much an integralpart of that system as the modern city apartment. Thereis nothing new in this prophecy: it has been talked aboutand virtually promised ever since radio telephony c
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Keywords: ., bookcentury1900, bookdecade1920, bookidradioforever, bookyear1922
