US1743106A - Radio system - Google Patents

Radio system Download PDF

Info

Publication number
US1743106A
US1743106A US134975A US13497526A US1743106A US 1743106 A US1743106 A US 1743106A US 134975 A US134975 A US 134975A US 13497526 A US13497526 A US 13497526A US 1743106 A US1743106 A US 1743106A
Authority
US
United States
Prior art keywords
frequency
circuit
coupling
antennae
transmitting
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
US134975A
Other languages
English (en)
Inventor
Clarence A Boddie
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.)
Westinghouse Electric Corp
Original Assignee
Westinghouse Electric Corp
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
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US134975A priority Critical patent/US1743106A/en
Priority to GB23421/27A priority patent/GB277329A/en
Application granted granted Critical
Publication of US1743106A publication Critical patent/US1743106A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/56—Circuits for coupling, blocking, or by-passing of signals

Definitions

  • My invention relates to communication systems, and more particularly to communication systems of the type in which high ⁇ frequency oscillations are guided along wire conductors to convey intelligence or to convey 4energy for effecting the operation of electric signalling, controlling and communicating apparatus located at geographically separated points in the system.
  • One object of my invention is to provide a system wherein eiiicient communication may be maintained at a plurality of frequencies, one frequency being used for transmission froin a given station vand a .different frequency being employed for reception from distant stations. .I
  • Another object of my invention 1s to provide in a system of the type described, means whereby duplex communication may be maintained without the necessity of changing the apparatus at any given station from the transmitting to the receiving' state.
  • Another object of my invention is to provide, in a system of the type described, an efficient antenna for phase-to-phase coupling, such antenna being provided with tuning means whereby it may be rendered simultaneously resonantv to a pluralityl of frequencies.
  • Still another, and more s eciicobject of my invention is to provide,in a wired-radio system, an antenna-coupling system comprising only two coupling conductors, intsead of the usual three.
  • the line-supporting poles are not sufficiently strong to carry the weight of the additional coupling antennae, and it has become desirable to reduce the number of such antennae to the lowest number compat-ible with eiicient operation.
  • Fig. 1 is adiagrammatic view ofa communicationsystem according to my invention
  • FIG. 2 is a diagrammatic view of a pre-V tennae, 6 and 7, while the station 5 is similarly equipped with two antennae 8 and 9. These antennae are electrostatically, coupled to the power lines, being supported in proximity t creto on poles (not shown).
  • the antenna 6 is connected, through a variable inductor 11, a
  • ' tuned circuit comprisingan inductor 12 and a condenser 13, va portion 14. of the secondary of, a radio-frequency coupling-transformer 15, ,the primary of which is connected to the transmitting apparatus (not shown), to' a] grounded conductor 16.
  • the antenna 7 is connected, through a variable inductor 17, a tuned circuit comprising an inductor 18 and a condenser 19, a portion 21 of the secondary of the radio-frequency coupling-transformer 15,A and a coupling inductor 22, to the grounded Avconductor 16.
  • a circuit, Dcomprising a condenser 23, an inductor I24: and the armature 25 of a wave-change relay 26, is connected in shunt to the coupling inductor 22.
  • a secondinductor 27 ' is so arranged that it may be substituted for the inductor 24, upon actuation of the wave-change relay.
  • the series circuit has zero reactance at the resonant frequency, when l At a lower frequency the capacity reactance predominates, and this reactance is called negative. At a frequency above resonance the inductive reactance is greatest, and the reactance in this'case is called positive.
  • the reactance of a parallel resonant-'circuit is given by the formula wL X1-a2ac; if the ohmic resistance of the circuit is neglected. Were it not for the resistance of the circuit, the reactance would be lntimte at the rfrequency which makes ⁇ the term l mL, v ((L w0$ lw2lp0p ois satisfied by two distinct and separate values of w or, in other words, by two values controlled by the ratio of Ls, the series inductance, to Lp, the parallel inductance.
  • aseries circuit may be traced to include the condenser 28, the inductors 11 and 17, the radio-frequency coupling-transformer secondaries 1 4 and 21, and the inductor 22.
  • a parallel resonant circuit comprises the inductors 12 and 18 and the condenserslfand 19. The component parts of both theparallel and seriesresonant circuits have been divided equally between the two antennae, in order that the center point therebetween may be grounded, and the current in each antenna may be made equal to that in the other.
  • the elements of the series and parallel circuits are so chosen that-the two frequencies to Awhich they are resonant, when considered as a whole,”are the transmitting and receiving frequencies to be employed in the operation of the entire system.
  • the output from the transmitting set is fed into the couplingantennae through the radio-frequency coupling-transformer and causes an oscillatory current in the circuitvv which includes the capacity between antenna 6 and antenna 7 Power is taken from the antennae by theflines 1 and 2 by virtue of the capacity coupling such' lines to each antenna.
  • rIhis capacity is represented by condensers 37 and 38, in Fig. 1.
  • Energy received from a distant transmitting station is fed into the receiving set through the inductors 22 and 34, the couplingantenna system being tuned to the receiving frequency, as explained previously.
  • vIn order-:that'the locally generated transmitting frequency may be prevented from affecting the receiving set,the shunt circuit, including thecondenser. 23 and the inductor 24:, is tuned'to be series'resonantto the transmitting frequency-,andcarries all, or nearly all, of the-transmitting energy circulating Yin the antenna System...l
  • the c1rcu1t including the resistance-shouted condenser 31 and the inductor 29 is so arranged that it induces a variable amount of energy at the transmitting frequency, and 180 out of phase therewith into the receiving apparatus 33. This balances out the voltage applied across the receiver due to the ohmic resistance of the shunt-circuit condenser 23 and inductor 24 or inductor 27, as the case may be.
  • a wave-change switch is provided which actuates a relay 26 to connect either of the shunting inductors 24 and 27 A in the circuit.
  • the condenser 23 and the inductor 24 are tuned together to the normal transmitting frequency, while the shunt circuit, comprising the condenser 23 and the other inductor 27, is tuned to the normal receiving frequency. It is lthus obvious that, when the appropriate inductor is connected in circuitl by the wave-change relay armature 25, the frequency to which it is tuned will be bypassed and prevented from affecting the receiver 33.
  • the use of the radio-frequency couplingtransformer to transfer the power from the transmitterl to the tuned circuit has the advantage of materially reducing the interference caused by the radiation of harmonics.
  • a plurality of conducting channels a transmitting set, a receiving set, an antenna coupled to each channel and to each of the transmitting and receiving sets, and 'means whereby said antennae together constitute a single circuit that is resonant simultaneously to a plurality of frequencies.
  • a communication system a plurality of conducting channels, an oscillation generator, an oscillation detector", an antenna coupled to each channel, said antennae being so connected together as to constitute a single circuit simultaneously resonant to a plurality of frequencies, and means for coupling said generator and said detector to both of said antennae.
  • aplurality of conducting channels means for generating oscillations, means including a plurality of antennae con stituting a single circuit resonant to a plurality of frequencies for introducing said oscillations into said channels, oscillation detecting means coupled tosaid antenna system, and means including a plurality of reactors, for preventing the generated oscillations from affecting the oscillation detecting means 5.
  • means for transmitting at one frequency means for receiving at another frequency
  • said plurality of means mutually including a coupling device tuned simultaneously to both frequencies
  • said antennae including a parallelresonant circuit and a plurality of inductors, the antennae being so disposed that capacitive coupling exists therebetween, whereby the anf said antennae including a parallel-resonant tenna system is resonant to a plurality of frequencies, means for setting up oscillations at one-of said frequencies in said antenna system, a receiving device coupled to one of said inductors, and a circuit series-resonant to said oscillations connected in shunt to the inductor to which said receiving device is coupled.
  • a plurality of antennae sol disposed as to be capacitively coupled to one another, a connection between circuit and a plurality of inductors, whereby said antennae system is resonant to a plurality vof frequencies, means for introducing oscillationsat one of said frequencies into said antenna system, aI receiving device coupled to one of said inductors for rendering apparent signals received by said antenna system at another of said frequencies, and means' for at Will luy-passing around the inductor to which said receiving device is coupled, oscillations at either of said frequencies.
  • a communicationsystem a plurality of conducting channels, a plurality of antennae so disposed as to be capacitively coupled to one another and to said channels, a connection between said antennaeJ including a parallel-resonant circuit and a plurality of inductors, a source of oscillations coupled to said antenna system, a receiving device coupled to said antenna system ⁇ and means for preventing said oscillations from adecting said receiving device, said last-named means including alphase-adjusting device.
  • a communication system a plurality of conducting channels, a plurality of antennae so disposed as to be capacitively coupled to oneanothez ⁇ and to said channels, a connection between said antennae including a parallel-resonant circuit and a plurality of inductors, a source of oscillations coupled to one of said inductors, a receiving device coupled to another of said inductors, a seriesresonant circuit connected in shunt to the inductor to which is coupled said receiving device, for by-passing therearound oscillations at the frequency to which said circuit is tuned, and additional means for preventing said oscillations from affecting said receiving device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Near-Field Transmission Systems (AREA)
  • Transmitters (AREA)
US134975A 1926-09-13 1926-09-13 Radio system Expired - Lifetime US1743106A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US134975A US1743106A (en) 1926-09-13 1926-09-13 Radio system
GB23421/27A GB277329A (enrdf_load_stackoverflow) 1926-09-13 1927-09-06

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US134975A US1743106A (en) 1926-09-13 1926-09-13 Radio system

Publications (1)

Publication Number Publication Date
US1743106A true US1743106A (en) 1930-01-14

Family

ID=22465903

Family Applications (1)

Application Number Title Priority Date Filing Date
US134975A Expired - Lifetime US1743106A (en) 1926-09-13 1926-09-13 Radio system

Country Status (2)

Country Link
US (1) US1743106A (enrdf_load_stackoverflow)
GB (1) GB277329A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2564615A1 (fr) * 1984-05-18 1985-11-22 Baylou Pierre Dispositif de filoguidage de vehicule automoteur par fil passif

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2564615A1 (fr) * 1984-05-18 1985-11-22 Baylou Pierre Dispositif de filoguidage de vehicule automoteur par fil passif

Also Published As

Publication number Publication date
GB277329A (enrdf_load_stackoverflow) 1927-11-03

Similar Documents

Publication Publication Date Title
US1743106A (en) Radio system
US2135037A (en) Antenna system
US2064400A (en) Duplex radio aerial system
US1770705A (en) Railway-traffic controlling apparatus
US1924303A (en) Phase shifting reactor
US2375722A (en) Carrier-current control system
US2554248A (en) Dephased inductive-interference prevention
US1765438A (en) Space-radiation antenna
US1723908A (en) Ignition system
USRE19854E (en) Duplex radio aerial system
US1928610A (en) High frequency signaling system
US1715701A (en) Inghottse electric
US2253393A (en) Method of connecting carrier frequency to a double circuit
US1657248A (en) Carrier-wave coupler
US1750347A (en) Antenna system
US1506742A (en) Modulating system
US1865952A (en) Line protecting and message transmitting system
US2839751A (en) Transmitting apparatus for inductive prospecting
US2049154A (en) Process for communicating with trains in motion by a high frequency current and applications
US2117154A (en) All-wave antenna and coupler system
US1862137A (en) Signaling system
US1797039A (en) Radio signaling system
US1800820A (en) Thkee-phase wired radio receiving circuits
US2854665A (en) Duplex radio communication systems
US1861437A (en) High-frequency supply