US1766047A - Radio transmission system - Google Patents

Description

June 24, 1930. A. H. TAYLOR RADIO TRANSMISSION SYSTEM Filed Dec. 15, 1926 INVENTOR 02' Y 7&%/ I wfiM *ATTORNEY '5 erence characterl' designatesan electron tube v Patented June 24, 1939 "AL ERT n. TAYLOR, F, WASHINGTON, msriicjr be panama; Assrdrioitjii news:

ASSIGNMENTS, 'ro "FEDERAL mme rm onrn Y} ,FORNIA 3 o f RADIO rrvAnsivnssioir'jsYsrnivt :1 H 7 Application filed December 15, Serial "No. i j i V Mydnvention relates .obroadlyto high fre quencysignal transmission systemsand-more particularly to a multiwave piezoelectric ter. o I One of the objects, of my. invention is to crystal "controlled high frequency transmit- 7 provide a circuit arrangement for a piezo electric crystal controlledv transmitter by Y which a plurality of signaling frequencies 7 maybe transmitted simultaneously from the same transmissionapparatus'.

Another object of my invention is to provide a circuit arrangement for piezoelectric crystal controlled transmittercircuits' in which a, plurality of predetermlned frequencies are sustainedi by" a 'piezo electric crystal element and simultaneously transmitted.

Another object of'jm'y invention is to pro vide a transmission system' n which a high frequency piezo electric crystal controlled oscillator is arranged to excite a power am-- plifier or frequency multiplier in such, manner that more than one frequency may be derived each related to the frequency of the piezo electric crystal element for the simultaneous transmission of signals at the plurality'of'separate frequencies.

Still another object :of' myinventiono is to i provide" a high frequency signal transmiss1on circu t includlng a piezo BlGCtI'lC' crystal x controlled oscillator witha -plurality'of separate antennae systems each arranged to be I excited at different-frequencies derived from crystalcontrolled oscillathe piezo electric. tor clrcuit. a I i yMy invention will be more clearly understood from'the following specification by ref- 1 erence to the accompanying "drawing which diagrammatically illustrates, the application of the circuit arrangementof my invention 7 vto a. high frequency. piezoelectric crystalcontrolledtransmission system. Referring to the drawingin more detail ref- .7 having its input andoutput circuitsarranged -cillations at the frequency of piezoelectric crystal element 2, the piezo electric; crystal is electromagnetically vare usuallythesecofnd and 'third harmonics,

element 2 positionedbetween conduchighwfrequency power amplifier; orin such 'manner'othat the tube functions siinultaneo'us z: sly as a high frequency power amplifierand 'frequencymultiplier,

*"Theoutp ut circuit of'the' 16; is designatedz'at 8 asincluding a pair: of indev pendently V tuned sections 9'} and 10 separated f y byawfari'able inductance 11. Tuned circuit 9 is constituted by inductance; 9 shunted by such manner that the tubexfunctionsas a1 variablei'condenseri 9?. Tuned circuit 110 ineludes inductance lOirsshunted" by variable tun 1 ing. condenser 10%, Z: -Thetun'ed circuit:9:,is adjusted to. one selected frequency? while the tuned circuit .10 is adjusted to a difl'erent se lected frequency; vBy supplying a high negative biasing voltage t across the leads 12 the tube: 6 operates} as a frequency -multiplier circuit; Tube '6' is "suppliedflwith high fre-V the frequency F of the piezoelectric crystal element-:2; ju'stedto a harmonic frequencyfF Joy-Chang;

sition of tuned condenser; 10

ferredthrough anytypeof coupling with the transmission circuit. Ihave illustrated{sepa I ratefanteiinae lorfradiajtfing'systems, at 15' and v quency excitation through-condenser 14 which 7 v connects with the outputcircuit 'Z of tube 1 at hevtunedcircuit; 9 maybe rad we I, I "itheiimsition r ble condenser; 9 f? The tuned; circuit; lomayj be adj e t {their}: v

harmonicyfrequencyF3changing e po 16' each independently tuned as represented at 17 and 18 and including inductances 19 and 20. Inductance 19 is electromagneticall 1 coupled with inductance'e Inductance ance 10.

coupled "with induct o i be any desiredharmonic of the-frequency F ofthe piezo electriccrystal device 2 but which respectively, can be controlled by slight ad? justments of condensers 9 and 10 and by the adjustment of the inductance 11 which is located between the tuned circuits 9 and 10.

'Modulation of the transmitter maybe ef- 5 fected by suitable circuits associated With 'the biasing circuit represented at 12. 111- stead of exciting 'circuit antennae systems the a. power amplifier may deliver energy to the r same antennae systems at different frequenv 0 cites; The. simultaneous transmissionati sep f ara'te frequencies largely reduces the loss of I signals'arising by reason of the phenomena of 1 V fading. The antennae 15 and 16 may possess diiferentcharacteristicsforthepropagation I ,0f energy, at the separated frequenciesin such'm-anner, that fading at therdiii'erent fine-1 -quencies.isicoinpensatedat a distant receiver.

' Other and further inodificationsof the, Oil? cuit; arrangement of my invention may be 'zomade. 31161110 limitations upon my inventi-on, are'intendedwother than are imposed by the. scope of theappended claim; v *WhatIiclaimas new 'and'desireto secure f t V by Letters Patent of the United States isas followsz'ig 7 Y Ahigh frequency transmission systemcom? prisin g a piezo electric crystal e lementgian electron tube oscillator circuit for sustaining oscillations developed by :said .fpiezo electric V sofcrystallelement, an electro'n'tube hating input 7 and output circuits With the input circuit 7 thereof connected with said t'e'lectrontubeos-H; cil'lator circuit a' pair'of independentl yr'tuned v7 circuitsgconnectediniseries insaidoutputcirsicuit, a" tuning device located betweensai'd I pair of independently tuned .-circuits and separate; antennae systems independently coupledto' each offsai d tuned circuits one of lsaid" antennae systems being arranged to '4 radi ate signaling energy at-ajfrequency which is ha-rinonicof theifrequency iof said piezo electric; crystal device: and the other of said antennae circuits -be'ing arranged toradiate V sign al'lin'g energy which is a different-hair .monicofthefrequencyof said'piezoelectric 7 crystal device, said tuning device operating to regulate the relative amount of energy supp'li ed-"rto said antennaeuat said diif-erent'fre quencies, said signaling;'energy'being main 1 tainejd in predetermined frequency displacej V Inentby operation of said piezo electric crystal device. ALBERTH; TAYLOR.

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