US1347328A - Radiosignaling system - Google Patents

Radiosignaling system Download PDF

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US1347328A
US1347328A US1347328DA US1347328A US 1347328 A US1347328 A US 1347328A US 1347328D A US1347328D A US 1347328DA US 1347328 A US1347328 A US 1347328A
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amplifiers
pliotron
current
modulator
grid
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation

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  • My present invention relates to the production of radio frequency continuous electrical oscillations for use in a. signaling system, and to ymeans for controlling theamplitilde of such oscillations in accordancewith the variations fin the amplitude ofia signaling current such, Afor examplepas a current produced by sound waves.
  • an velectron discharge device ⁇ of the type known as pliotron consisting of a filamentaryelectron emitting cathode, an anode and a discharge controlling grid inclosed 4in an envelop evacuated to such a degree .
  • That ythe device is operatively independent of positive gas ionization at voltages above tlus ionization voltage characteristic of whatever ⁇ residual gas remains Vwithin the envelop, may be utilized to advantage for the reduction of radio fre uency continuous oscillations.
  • Devices of t is type have been described by D1'. Irving Langmuir in a paper published in the Prooeed'n s ⁇ of the Institute of Rad-o Engineers of eptember 1915.
  • a pliotron ma also be used to advantage as an amplifier o variable currents since by reason of its property of being operable at high voltages the energy output which maw he obtained from a single device is much greater than that obtainable from previously known electron discharge devices in which gas ionization takes place and affects the operation even at low voltages.
  • One of the objects of my invention is to provide an improved system in which pliotrons are used for supplying modulated radio frequency currents to a radiating system.
  • a further object of my invention is to provide a circuit arrangement in which a Single source of energy may be utilized for Specification of Letters Patent.
  • an electron discharge device which is preferably a pliotron, for producing radio frequency oscillations
  • I impress an oscillating potential obtained from this oscillator upon the secondary o f a transformer which is connected to the grid circuits of a lurality of pliotrons connected in para lel in order to produce an amplified radio frequency current which will supply the desired amount of energy for the operation of the radiating system.
  • the radio frequency potential which is supplied to the grid circuits of the amplifiers is modulated by means of another pliotron whose plate circuit includes the transformer secondary.
  • the resistance of the modulating pliotron is varied by varying the potential of its grid in accordance with variations in the signaling current.
  • the pliotron 1 comprising the usual filamentary cathode 2.
  • anode 3 and grid 4 inclosed in an evacuated envelop is employed turns which may siderable amount radio frequency oscillations, and l term this the master oscillator.
  • 'l ⁇ lie anode and grid of the master oscillatorI are connected to'a circuit which comprises an inductance 5 and a variable condenser (i by means ol which the circuitl isA tuned to the frequency of the oscillations which are to he produced.
  • Energy for the operation ofthe lmaster oscillator is supplied to the plate circuit by thedlrect cufrren't gem erator 7 which is connected to the cathode :ind'ariode','r the cathodeA being grounded atS.
  • ⁇ )ondfrnserltl 'prevents the direct current component of the plate current from flowing through inductance.
  • An indncta'nce 1t) 1n series with the generator ianda condenser- 11 in parallel therewith serve to smooth out any irregularities in the current suppl-y and a choke coil 12 which 1 term a radio frequency chokel coil prevents the radio frequencyxicyy component of the plate current from owing through the generator 7.
  • .It has been Vcustomary heretoore to" regard any large inductance as achoke coil for radio frequency currents.
  • rEhe direct current generator 17 with an induetance 18 in series therewith furnishes current for heating the cathode ofthe master oscillator and also lier the cathodes of thecther pliotrons as indicated.
  • lV'hile the circuit which l have the grid a definite podesmihed above For producing oscillations is the one which l prefer other circuit arrangements may be used without departing from the scope of my invention. ⁇
  • the indnctance 5 forms theI primary of a rad-io freqaiency transformer, one end of the secondary 19 of which is connected to the cathodes of a series of amplifying pliotrons 20, 2l, 22, which are all connected in multiple. Wliule l. have indicated only three pliotrons thus connected, as many may he used in this way as desired or as may be ynecessary to secure the desired output in the radiating system.V A suitably selected point 23 in the secondary 19' is connected to the grids of the amplifiers through a con'- dcuser 24 and a resistance 25.
  • llhe grids of' these ampliliers are maintained ata definite potential with respect to the cathodes by means Aof the battery 14, a radio frequency choke coil 26 in series therewith pre venting radio frequency currents from flowing through the battery and the condenser lpreventi'ng the Short circuitingof the battery through secondary 19 of theitransformer.
  • a radio frequency choke coil 26 in series therewith pre venting radio frequency currents from flowing through the battery and the condenser lpreventi'ng the Short circuitingof the battery through secondary 19 of theitransformer.
  • the ⁇ generator T furnishes Vcurrent for the operation of the plate circuits of the amplifiers and the anodes of the amplifiers in the present case are connected through a condenser 2 and a variable contact 28 to in dnetance 29 which is included in circuit with the antenna 30.
  • a condenser 2 By connecting the plate circuit of the amplifiers to the antenna in this way a definite best impedance may be secured as a load on the amplifiers. It has been found that the amplifiers operate most eliiciently when the impedance of the load circuit has a particular value, this value de pending u on the characteristics of the amplifiers. ince the antenna system as a Whole may not. have the desired impedance l include in the load circuit only enough of the antenna impedance to give the desired value. It will of course be lapparent that the output of the amplifiers may be supplied to other load circuits than an antenna if desired.
  • the output of the amplifiers is a function of the voltage impressed upon their grids from the transformer secondary 19, this voltage being due to the alternating current o f radio4 frequency produced in inductance 5. If the transformer secondary 19 be shunted by a variable resistance the voltage across it will vary as a Jfunction of the value of the resistance. For a very high resistance the voltage will be practically the same as for ail open circuit and the output of the amplifier will be a maximum. l* or a short circuit the input voltage'and high frequency output of 'the amplifier will both be zero. For intermediate values'of resistance the amplifieroutput will depend uponthe particular value of the resistance.
  • Ethe potential of the ,modulator grid is varied 7in accordance wfitlrvariation's in a telephone'current produced byn'vthe.telep'honetransmitter 34 which is included in a local circuit v'with lbattery 35 and the ⁇ primarily 36 ofan audio frequency transformer.
  • he telephone current thus produced 4is amplified by impressing the potential of the transformer ⁇ secondary 37 upon the ii-id of a pliotron amplifier 38.
  • the modulator is connected across all of transformer secondary 19 ⁇ while only a portion of secondary 19 is connected in the grid circuits of the amplifiers. This arrangement may be reversed if desired or both connections may be made to the same point in secondary 19.
  • the object et varying the points of connection is to secure the most eiiicient operating voltages late circuit and the amplifier gridA circuits. It will usually he found desirable to connect the circuits in the manner indicated, as by this connection the modulator plate circuit will operate at u higher voltage than that applied to the amplifier grids and this condition will be most suitable for efficient operation.
  • seid connection being variable in order to adiustthe impedance in the lood circuit of the amplifiers to n value suitable for the most eiicient operation of the s stem.
  • pliotron modulator having its cathode and anode connectedv to Sndseconrl inductunce, means for varying the grid potcntial of said modulntor, in accordance with variations in s signaling current, an earth connection tothe cathodes of seid oscillator, amplifiers and modulator, e common direct current source of glass for supplying energy to the plate circuits of seidv oscillator und said amplilier, and e common direct current source of potential Jfor fixing the normal potential of the grids of said oscillator, am pliers and modulator.
  • pli'otron modulator having its cathode and anode connected to said second inductance, means for varyin the grid potential of seid modulating p otron in accordance with variations in a signalin current, an earth connection to the catho es of said oscillator, amplifiers and modulator, a

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US1347328D 1917-03-29 Radiosignaling system Expired - Lifetime US1347328A (en)

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US520939XA 1917-03-29 1917-03-29

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FR (1) FR520939A (fr)

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FR520939A (fr) 1921-07-04

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