US1465962A - Wireless signaling system - Google Patents

Wireless signaling system Download PDF

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Publication number
US1465962A
US1465962A US244839A US24483918A US1465962A US 1465962 A US1465962 A US 1465962A US 244839 A US244839 A US 244839A US 24483918 A US24483918 A US 24483918A US 1465962 A US1465962 A US 1465962A
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US
United States
Prior art keywords
current
circuit
source
amplitude
frequency
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
US244839A
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English (en)
Inventor
Ernst F W Alexanderson
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 NL15249D priority Critical patent/NL15249C/xx
Priority claimed from US92156A external-priority patent/US1465961A/en
Application filed by General Electric Co filed Critical General Electric Co
Priority to US244839A priority patent/US1465962A/en
Priority to FR499212A priority patent/FR499212A/fr
Application granted granted Critical
Publication of US1465962A publication Critical patent/US1465962A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H04B7/12—Frequency diversity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20207—Multiple controlling elements for single controlled element
    • Y10T74/20238—Interlocked
    • Y10T74/20244—Push button

Definitions

  • One of the objects of my invention is to provide a means for prolonging" the time during which the signal can act with accumulative etl'ect 'on the receiving device considerably beyond the time during which disturbances can act.
  • I make use of e tuned circuit of lower then radio frequency, but above audibility for effecting the prolongation of the time during which the signal and disturbances may be compared.
  • the desired lower frequency is provided by means of interference heats between two radio frequencies. Both of these frequencies may be produced at the sending station, or one of theni may be produced at the receiving station.
  • I also provide means for producing. trans-- initting and receiving both radio frequencies.
  • An arrengernent'of this kind is more effective than one employirig a single radio frequency because it is more selective and proof against interference, both frequencies being necessary to produce an impression. in the receiver.
  • any invention is to provide means for efiiciently producing signals of the desired character.
  • l iese branches connect the windings cf'lwe' magnetic CQHlZX'OllfiZS o3 amplifiers 4 and 5.
  • Each of tlieee crunch circuits include half of the secondary tz'ensfomer 3., the mid.- d e point of which is grounded.
  • the megne tic ccnti'ollei's or amplifiers which I p17eto use in the present case, both as to their construction and method of operaicn, are described in detail in my Letters extent of the Uniiecl States, 1,328,797.
  • Each controller comprises e reactive Wincllug" consisting of two coils 6 and '7 Wound upon independent magnetic cores 8 and 9.,
  • the two cells of each winding are connected in parallel with each other in me circuit and are so arranged that their magnetizing- Eucli magnetic cenecollci is also provided Willi two controlling windings l and 11. wound around the magne'ilcceres S and 9 as N magnetization pl'oducecl by currents in the controlling windings will be in the same clireclion in berth cores.
  • onlrrolling windings 11 are both supplied from llie same source of ⁇ cuIlBlll, which in the pi esent case may be en elternecor 12 of much lower frequency than that, of elcernator 1, yet liaving'u froquency above the range of auclibility.
  • Coueroll ng windings are supplied with direct current irom any suitable source, such, loc
  • the controlling windings 10 are connected to the generalcr 13 time theii magnetic effects upon the two controllers are opposite with respect to the instantaneous cmgnetic reactions set up in the controllers by current from generator 12.
  • the controllingwindings 10 and 11 are so proportioned and the current sour-es l2 and 13 so chosen and adjusted that the maximum ampere turns of Winding 11 is zipuioxim'lely equal to the ampere turns of comm. conliollci 4- .will have a maximum of controlling ampere turns when the controlling ampere turns of controller 5 are practically zero and vice versa.
  • the cl arecteriscic of inleqpc see an impedance substantially "elcnl; to an open curcuitun the ccnnectlcn indicated so that 1 ng winding 10.
  • the enciceeion varies jfmm zerc to maximum.
  • llic'curi'eni Wave of controlling ul ielrimtor 12 is a maximum one of the contljollcl's eels a.
  • the wave thus produced in the antenna may be esolved into two waves of constant amplitude, one having alcequency greater than that of the alternator l by an amount equal to the fifequeney of alternator 12 end the olncr having :2, frcquemy us lllllCll lower than that of u'hc alternator 1. l1? either one of glue magnetic 11111)) cm 4; and 5 were used alcne it would lie pos ils-lc to transmit from a single antenna aves of any one of three li'requencies and by providing; multiple ⁇ cunlug of the antenna-Waves cf two or more requencics may be transmitted simulc-Lmco'usly.
  • variable inductance 1 may provide for one tuning and We variable coir denser 15 in shunt to inductance 16 may pr0- Vide for a second tuning at a different "frequency. If, for example, alternator 1 has a frequency of 75,000 cycles and alternate: 12., 5000 cycles, the antenna may be tuned for 80,000 and ;000 cycles; 80,000 and 70,000 cycles, or 75,000unc1 70,000 cycles. By pi'0Vi(l--' ing a third curled circuit in multiple we the antenna all three frequencies may be transmitted simultaneously.
  • variable condensers 17 may be connected in series with the windings 6 and 7 of the controllers to neutralize the leakage inductance in the windings thereof so to bring the minimum value of the impedance as near as possible to ashort circuit. It may also be desirable to employ condensers 18 in series with each.
  • the output delivered by the alternator 1 to the antenna must be periodically varied between a maximum and a minimum.
  • the energy outputwhich can be obtained from the alternator is less than it would be if it delivered full power continuously.
  • an oscillating circuit may be pro vided which is capable of storing up considerably more energy than the alternator must give out during one period of the amplitude pulsations.
  • energy may be stored up in the oscillating circuit when the energy taken by the antenna is a minimum and when the energy taken by the antenna is a maximum energy may be drawn niomentarily from the oscillating circuit at a greater rate than the alternator is able to deliver.
  • the oscillating energy storage circuit may be made up of the primary of transformer 3 and condenser 19.
  • a key 20 may be inserted in the circuit of alternator 12.
  • this key When this key is open the impedance of the two con- (rollers 4 and 5 will be equal and since they are connected in opposition to each other no current will be supplied to the antenna.
  • the key When the key is closed currents having amplitude pulsations will be supplied to the antenna in the manner described. I
  • Fig. 2 I have shown an organization in which a single magnetic controller 21 is em ployed to secure the desired frequency split-- ting.
  • a single controlling winding 22 is shown and the alternator 12 is connected tothe winding in series with a battery 23 having a potential substantially he same as that of alternator 12.
  • the controlling windings 6 and? of this controller are connectedin shunt to the se ondary of trans former 3 instead of in series as in the rangement shown in Fig. 1.
  • An oscillating energy storage circuit comprising inductance 23 i and condenser 25 connected in shunt to In Fig. 3 I have illustrated another modi fication in which the circuit which provides the second tuning for the antenna is also utilized as an energy storage circuit.
  • Controller 5 in thistcase is connected in series with the antehnaand controller at in a circuit in shunt to the secondary or transformer '3.
  • the main antenna tuning is made by means of variable inductance and the second tuning by variable condenser 31.
  • This condenser in connection with inductances 32 forms an energy storage circuit.
  • the method of transmitting signals which consists in producing currents of two diliicrent radio frequencies from a single source of current of radioirequency first producingfrom said source 21 currcntjhcv ng amplitude pulsations of uniform character in which corresponding impulses of uni; two adjacent groupsof amplitude pulsations arc opposite in phase and-then conducting;- the current thus produced through a circuit haw ic zm branches which are resonant to the arm requcncics desired whereby the current i is resolved into two currents of con- ,mplitudc and the frequencies and utilizing the two currents thus produced for'the tr'onsmission of signals. 4
  • si usls which consists in. producin currents or different rudio frequencies from as single source of current of radio frequency by delivering currentv from said source to a suitable electric circuit, uniformly varying the amplitudes of the impulses of current thus delivered to produce, u current Wave having amplitude pulsations 0)? s lower fro quency than that of the source shove audibility, and then conducting the current thus produced through a circuit having two branches which are resonant to the two frcquencies desired wherchy tho current wave Will he resolved into two currents of cow stout amplitude and of the frequencies deand utilizing the two currents thus produced for the transmission 'o'l' signals.
  • the niethodot producing currents of two different frequencies from single source of current of radio frequency which consists in. dclivcring current from. said source to a suitable electric circuit, uniformly varying: the amplitude of the rim-- puls'cs of current thus delivcrcd to produce a current wave having amplitude pulsations of a lower frcqucncy than that of the source but above audihility, storing up energy from the current source in a second resonuuhcircuit when the amplitude of the currcntds livcred is smaller than that which the source amplitude pulsotious of tho is cupublc of delivering normoliy, delivcn ingthc stored up energy to the firstcircuis When'thc amplitude of the.
  • the amplitudes of the impulses. of currcnt'dclivercd to said circuit means periodically reversing with respect to currentsource sud with corresponding to the: desired frequency oi the issue, the di motion of current .llow in circuit.
  • second res-count circuit associated with the first circuit for storing u energy irom the con rent source when no.
  • Means for producing on ul'sctrio cur--- c uivalcnt or two rent Wave which is the electric current Waves oioifiurcht lircqucncies and or" constun sinplisudcs, comprising a source of continuous cucrcul; of radio frequency, on electric circuit ossociutcd therewith, mucus for uniformly varying the amplitudes of the pulsctions supplied to said circuit in such o way as to produce u current wave with regularly recurring amplitude pulsations, and as second resonant circuit ussocistc'd with the.
  • first circuit for storing up energy from the current source when the amplitude of the current delivcrcd therefrom to the first circuit is smaller ihoh that which the sourcc is capable of dciivcr ing normally, and delivering" energy to the first circuit when the amplitude? the current flowing therein isgrester than that nor mally furnished by 'thccgxrreht source.
  • -prising means for producing currents of two different frequencies comprising a single source of current of radio frequency, on electric circuit associated therewith, means for deliver-in to said'circuit a current having amplitude pulsations of uniform character in which corresponding impulses of any two adjacent amplitudebeltions are opposite in phase, said electric cir- Ell cuit having two branches which are resonant to the two frequencies desired whereby the current furnished thereto may be resolved into two currents of constant amplitude and of the frequenciesdesired and means for utilizing said currents for the transmission of signals.
  • Means for transmitting signals comprising means for producing currents of two different radio frequencies comprising a single source of current of radio frequency, an electric circuit associated therewith, means for uniformly varying the amplitudes of the impulses of current delivered to said circuit to produce a current wave having amplitude pulsations of a lower frequenc than that of the source but above audibility, said circuit comprising two branches which are resonant to the two frequencies desired whereby the current Wave stant amplitude of the frequencies desired and means for utilizing currents thus produced for the transmission of signals.
  • Means for producing currents of two different radio frequencies comprising a single source of current of radio frequency, an electric circuitassociated therewith, means for uniformly varying the amplitudes of the impulses of current delivered to said circuit to produce a current wave having amplitude pulsations of a lower fre quency than that of the source but above audibility, said circuit comprising two branches which are resonant to the two frequencies desired, whereby the current wave may be resolved into two-currents of constant amplitude and of the frequencies desired, and a second circuit associated with the first which is resonant to the frequency of the current source for storing up energy from said source when the amplitude of the current delivered is smaller than that which the source is capable of deliverin norm-ally, and delivering energy to the rst circuit when the amplitude of the current flowing therein increases beyond that normally furnished by the current source.
  • a magnetic controller associated with each of said parallel paths, means for varying the impedance of each of said magnetic controllers in accordance with variations in said controlling current, and a signaling device in circuit with said source of controlling current.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Superheterodyne Receivers (AREA)
US244839A 1916-04-19 1918-07-15 Wireless signaling system Expired - Lifetime US1465962A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NL15249D NL15249C (oth) 1916-04-19
US244839A US1465962A (en) 1916-04-19 1918-07-15 Wireless signaling system
FR499212A FR499212A (fr) 1916-04-19 1919-05-08 Perfectionnements aux systèmes de radiosignalisation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US92156A US1465961A (en) 1916-04-19 1916-04-19 Wireless signaling system
US244839A US1465962A (en) 1916-04-19 1918-07-15 Wireless signaling system

Publications (1)

Publication Number Publication Date
US1465962A true US1465962A (en) 1923-08-28

Family

ID=26785336

Family Applications (1)

Application Number Title Priority Date Filing Date
US244839A Expired - Lifetime US1465962A (en) 1916-04-19 1918-07-15 Wireless signaling system

Country Status (3)

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US (1) US1465962A (oth)
FR (1) FR499212A (oth)
NL (1) NL15249C (oth)

Also Published As

Publication number Publication date
FR499212A (fr) 1920-02-04
NL15249C (oth)

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