US2334011A - Radio transmission system - Google Patents

Radio transmission system Download PDF

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Publication number
US2334011A
US2334011A US380021A US38002141A US2334011A US 2334011 A US2334011 A US 2334011A US 380021 A US380021 A US 380021A US 38002141 A US38002141 A US 38002141A US 2334011 A US2334011 A US 2334011A
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US
United States
Prior art keywords
frequency
wave
signal
transmitter
intensity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US380021A
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English (en)
Inventor
Halsey W Kline
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE482543D priority Critical patent/BE482543A/xx
Priority to US22884D priority patent/USRE22884E/en
Application filed by General Electric Co filed Critical General Electric Co
Priority to US380021A priority patent/US2334011A/en
Application granted granted Critical
Publication of US2334011A publication Critical patent/US2334011A/en
Priority to FR952147D priority patent/FR952147A/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/005—Control of transmission; Equalising
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas

Definitions

  • This invention relates to a signal transmission system, and more particularly to a carrier Wave systemior transmitting signals in lWhich fading 4is ⁇ minimized or eliminated.
  • the skip Y distance The Width of ⁇ such yazone in Which the transmitted wave cannot be received is commonly termed the skip Y distance. Itv isusuallyassumed that this skip exists because' a radio Wave from a transmitter z noves near the ground only for a short distance before it becomes attenuated to an intensityftoo flow VtolteV received, while ionized'v layers in the upper atmosphere reflect theV waveV from the transmitter. to positions much farther removed than those to which the ground Wave reaches.
  • I utilizeV a system' in Awhich a' radioL Wave, for example, is radiated in sucha way that a directional characteristic may ⁇ be changed.
  • VIi the' radiation is in theior'mv of ⁇ a"beam, the direction of propagation of the' beam 'maybe alteredperiodically.
  • Asthe beanidiffer:L tion is periodically altered, reection from Athe 'ionizedlayers varies in direction and position,
  • Thedipole antenna i3 liesf ara el to the fabel of the ser-th and-a1; :.asdlsienel @bore-:tbe surface of the eartlrequal toI onequarterwave ,lengthpf the waveiinpressed vonthe antennaJl A Similar; dirmi@ antenna A2,3.- is piaced parallel l t5 from Athe antenna l3and one-guarterwave length abovetlfie vsurface oi the-earth -If'he dipole an: term@Y 213 is interrupted @brits *Der ⁇ @i the-ineffupiien'iS-bidged seessfre'su., n.tlgfcuii comprising an inductane; @j condenserZpos; electron dwellers@ devise 21%;y lhe dipolefantenna 23:15 arrangedl t0 ad'. este reflector of the waves radiated fr camtlie antenna I
  • onant circuit is adjusted to a'frequencydiierent from'that of the waves radiated kfrom 4the. an;
  • 3,.the reflecting antenna 23 is effectivelyv interrupted at its center,y and does not 'reflect waves of such' frequency.
  • the antenna system radiates waves-upward from the antenna I,3,'because of 'the reflecting'fpower of the surface of th'eearth.
  • the screen electrode "34 is supplied withfoperating potential through a resistance 35 from the positive yterminalv oi source 29;and isfbypa'ssed through'a bypassing condenser "36 toapointl between the choke coil 30 and-the resistance
  • Av potential is'supplied from the anode of d'e- Y circuit" including inductance 24, condenser ⁇ 2i, and discharge vdevice V26,1. changes With .aconcur- 'rent change in the, ⁇ directionloi: 'maximum radintionlfro'rn kthe antenna'. I3.
  • y'i'he output cirjcuit 'o'fiamplier 43 includes 'a switch '41'. having ,three positions Stance 'ItS' :operation L when. 1 1 the' other 6r its positions Wm-later be mmcatgd. i, i t
  • the 'potenciar lsource 4l may befrna'de oLJsuch yvalue as .to make Ithe series. .resonant circuit resonant lat aA frequency-removed fromthe. frequency" waves furomthe I3 by an amount ⁇ equ ⁇ al .to.the shift otresonant-he- A quencycausedby theaverage-fpealcintensityof I t6 ⁇ signals"from theL microphone 42.. .'Suli signalent peak ⁇ intensity then make the series eircuitresonate'atf'the freduencyof waves fromantenna I3, I@ .y f
  • Intlmtifui'trans- .mission which comprises varying the y.of propagation of4 theV rradiationz.causes the .dilltantgfreceiver to rreceive more or energy in accordance with thalintensityfog signal :from the -microphonef-Theli'reoswed waveA therefore appears-to in* vnal be higher than the highest frequency of the ⁇ dinary typereceives ⁇ the carri .tently, as l explained in connec ble.
  • An ordinaryreceiver which comprises varying the y.of propagation of4 theV rradiationz.causes the .dilltantgfreceiver to rreceive more or energy in accordance with thalintensityfog signal :from the -microphonef-Theli'reoswed waveA therefore appears-to in* vnal be higher than the highest frequency of the ⁇ dinary typere
  • An antenna I the carrier wave as it P,9S Se -With' the fblades ofthe switch 41 in the abQve mentionedjdownward position,l the ⁇ blade :45j is l connectedto ground, and the blade 45 is';con nected through a conductor
  • the ratefa't which the beam is swept up and down in the ,absenceof ⁇ a sigsignal whichit is desired to transmit For example, if it ybe desired to transmit an audio' signal Q havingr frequenciesextending, for.I example, y to 10,000 cycles, itis preferredthat the discharge device 8
  • the voltage across the resistance -I I5, therefore, Avg5 corresponds to the output -voltagenof the tuned l circuit 82, 83,
  • the frequencyof theyoltage f acrossv t-he Vresistance I I54 is, therefore, constant" Y inthe'absence ofv asignal from the microphone l2, Aandvaries in req'uencyefrom this constantw'm frequency when asignal n is transmitted from ⁇ the microphone 42.
  • ⁇ may be of the-order 993013129 ,t0 .50:510-
  • H51 has., a" value ⁇ atEallivialluesr 'f Volta'gejacross 'theresistance
  • circuit whichzis'o'poected 4 resistance -I ⁇ I5comprises apair 'of diode recti-Y ⁇ r ners
  • 22 'iand” l,23,vwhich component is inpha'se'with voltage 'across ith'e 're'sistanoe I I5; jThdSelatf Y,ter components; are ,applied throughvja coupling l gconjclcaser,4 lz connected, betweeo'thecenter tap of "a vtra'.'n ⁇ sioreiner A'I' ISjand a 'point between1 resinjanoe "i I 5' and detector Ijl dqTo the secondaryfof this; transfor
  • 9 impresses -a voltageon one of the diode rectifiers, which Voltage leads Lby substantially 90 the voltage across the resistance I I5.
  • The,tuned transformer applies across the other diode rectifier a voltage of equal magnitude, which voltagelags-by substantially 90,y the voltage across the resistance I5.
  • .ey furtheradjustment 'of mesme-Cn time y* Y transmitter illustrated in Fig. l may be utilized for a third type of transmission in which the b eamfrom the antenna
  • 40 is. coupled through a coupling condenser
  • 43 is connected through a resistance 4
  • a suitable phase shifting network appliesan alternating potentialfto the control electrode
  • Thisnetwork comprises l a series combination of a condenser ,
  • Ihecontrol electrode 52 isv connected to a pointrbetween the condenser
  • 40 transmitslleading current between its anode
  • the tunedcircuit I0 comprises anelectrondischarge deviceMD, which K odev
  • the transmitter when so connected, cyclicallyvaries the directionpf radiation from theantenna
  • the carmen wcyfein' the. transmitter or 'i is impressed directly on the dipoletantenna i fromV thejhigh frequency :carrier transmitter-H;
  • oscillations from the'vcarrie'r lwavenlenerator are similarly transferredto the inputcircuit of the, discharge device' ⁇
  • 62I may betraced fromvthe control electrode f 1
  • 60,1butfn have substantial reactance at the 'highest frequency of l signals Vfrom the lili- ⁇ cr'ophone
  • the planeet polarizationv of the radiatedv wave (rather "than the'A direction lof the' props# :2,3345011 gatedlbearnl 1, islvaried at a frequency which v is modulated from' a mean value in accordance with ⁇ - ⁇ tlie-intensityoff ⁇ ⁇ the' modulating signal.
  • anyreceiverfor amplitudemodulat'ed' waves havq l 'ing' an: antenna lprim arily' responsive to carrier vwawes'polarized1in one particular plane may be used'.- ⁇ W ith'y thelswitch
  • a radio transmitter a radio receiver, said receiver being spaced from said transmitter by'suiiicient distance that the path of transmissionv of Waves between said vtransmitter and receiver may be adversely affected by disturbances- ⁇ to which said path is subject, means to Y radiate'flrom said transmitter--a Wave having its L ,plane of polarization modulated ata 4frequency "modulated, in response .to-a desired signal, said frequency Abeing"v substantially ⁇ rhigher than the highest frequency ,ofy said ⁇ signal, means-for causing said receiver't'o respond predominantly to said wave when polarized in a particular plane, Whereby amplitude modulations of said Wavecaused by said disturbances produce minimum effect on said receiver and said receiver receives said wave with modulations of intensity in accordance with a function of said signal, and means in said receiver responsive to said modulations of intensity for reproducing said signal.
  • a signal source means for radiating a carrier wave, means for modulating the axis of polarization of said carrier Wave at a frequency modulated in accordance with the intensity of said signal, and means responsive to modulations of the axis of polarization of said wave to receive said wave and reproduce said signal.
  • aradio receiver *comprisingl meansy toj receive @carrier Wave at different intensities as a cyclicallyvvary'- .ing directional; characteristic; thereof ⁇ varies,k the frequencyI of variation-'of said-rcharacteristic ⁇ l varying from a predetermined frequency in ac ⁇ cordancewith the intensity-.decia signal, means' vfor detecting said received car-rierwave to produce a voltage of which theintensityfvariesat a frequency corresponding -to the frequency at ⁇ .which said directional characteristcvares, and -means responsive to valfiationsof the frequency: of said Y reproducesaidfsignaL oltage: from said predetermined A'frequency to '7.
  • In asignal ,transmission transmitter comprising ⁇ a carrier-,wave Isource. a signal source; an antenna energizedfrom-snid carrier wave. source and arranged to radiate 1a .carrier wave fromfs'aid-source, means for reectingtlie ⁇ radiated carrierrwave in different directions,- Vand means for adjustingfrsaid reecting ⁇ means to alter the direction of refiection'of carrierfwave cyclllyat affrequency modulated Y yin accordance with' a function of the intensity 'of Y a signal fromsaid signal source.- f Y 11.y

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Burglar Alarm Systems (AREA)
US380021A 1941-02-21 1941-02-21 Radio transmission system Expired - Lifetime US2334011A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE482543D BE482543A (OSRAM) 1941-02-21
US22884D USRE22884E (en) 1941-02-21 Ramo transmission system
US380021A US2334011A (en) 1941-02-21 1941-02-21 Radio transmission system
FR952147D FR952147A (fr) 1941-02-21 1947-08-19 Système de radio-émission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US380021A US2334011A (en) 1941-02-21 1941-02-21 Radio transmission system

Publications (1)

Publication Number Publication Date
US2334011A true US2334011A (en) 1943-11-09

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Family Applications (2)

Application Number Title Priority Date Filing Date
US22884D Expired USRE22884E (en) 1941-02-21 Ramo transmission system
US380021A Expired - Lifetime US2334011A (en) 1941-02-21 1941-02-21 Radio transmission system

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US22884D Expired USRE22884E (en) 1941-02-21 Ramo transmission system

Country Status (3)

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US (2) US2334011A (OSRAM)
BE (1) BE482543A (OSRAM)
FR (1) FR952147A (OSRAM)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2631280A (en) * 1949-08-31 1953-03-10 Rca Corp Remote-control system for radio receivers and the like
US2867276A (en) * 1955-04-14 1959-01-06 Wales Strippite Corp Self-contained perforating implement

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2756418A (en) * 1953-01-23 1956-07-24 Bell Telephone Labor Inc Multiplex system employing polar modulation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2631280A (en) * 1949-08-31 1953-03-10 Rca Corp Remote-control system for radio receivers and the like
US2867276A (en) * 1955-04-14 1959-01-06 Wales Strippite Corp Self-contained perforating implement

Also Published As

Publication number Publication date
BE482543A (OSRAM)
USRE22884E (en) 1947-05-27
FR952147A (fr) 1949-11-09

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