. Bell telephone magazine . er are ten push but-tons, which take the place of the usualcalibrated tuning dials. These repre-sent ten different radio frequencies orwave lengths, and are used for thesame purpose as the push buttonsfound on some home radios. By de-pressing one of these buttons, theoperator automatically tunes thetransmitter or receiver to the fre-quency desired—and in a fraction ofa second he can change the frequencyand talk on a different radio channel. Behind a cover on the front of thetransmitter are ten small quartz wa-fers, each enclosed in a plastic crystals dete
. Bell telephone magazine . er are ten push but-tons, which take the place of the usualcalibrated tuning dials. These repre-sent ten different radio frequencies orwave lengths, and are used for thesame purpose as the push buttonsfound on some home radios. By de-pressing one of these buttons, theoperator automatically tunes thetransmitter or receiver to the fre-quency desired—and in a fraction ofa second he can change the frequencyand talk on a different radio channel. Behind a cover on the front of thetransmitter are ten small quartz wa-fers, each enclosed in a plastic crystals determine the exactfrequencies on which the set will op-erate, and keep it from interferingwith other transmitters. A drawerin the cabinet contains 70 additionalcrystals, each one made for a different radio frequency. By plugging in anyten of these in the crystal compart-ment, the transmission band ischanged completely. A special mounting which holds thetransmitter and receivers and securesthem to the tank chassis is more im-. Ten of these tiny quartz crystals oper-ate in each FM radio. In each tank set70 more, and in each artillery set nomore, are available to change bands portant to the successful operation ofthe set than its appearance a moving tank, lunging and buck-ing over rough ground and levelingtrees as large as telephone poles, eventhe crew must wear helmets and heavypadding to avoid injury. An unpro- 58 Bell Telephone Magazine SPRING tected radio set would be quicklydamaged, no matter liow strong itsparts and connections. Tlie mount-ing which is used was designed by theBell Laboratories and is furnished byWestern Electric as a part of theequipment. With the help of a lead-ing rubber company, a special absorb-ent pad was developed which pro-vides the necessary protection and isunaffected by extreme between the set and the tankframe, these prevent shocks and vi-bration from reaching the radio appa-ratus. To discover just how muchpunishment
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License: Licensed
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Keywords: ., bookauthoramerican, bookcentury1900, bookdecade1920, bookyear1922
