USRE14380E - Ments - Google Patents

Description

E. H. COLPITTS.

SYSTEM FOR THE TRANSMISSION OF INTELLIGENCE.

APPLICATION FILED APR.9. 1917- Reissued Oct. 23, 1917.

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' cordance with the low e UNITED STATES PATENT OFFICE.

EDWIN H. GOLPITTS, OF EAST ORANGE, NEW JEnsEY', .essronon, BY MESNE ASSIGN- mnnrs, 'ro AMERICAN TELEPHONE & :rELEenAPn oomPAnY, A- CORPORATION OF NEW YORK.

SYSTEM! FOR THE TRANSMISSION-OF INTELLIGENCE.

Specification of Reissued Letters Patent, B,eissued Oct, 23, 1917.

Original No. 1,137,884, dated April 27, 1915, Serial no. 839,318; filed May 18, 1914. Application for reissuefiled April 9, 1917.

and State of New Jersey, have invented certain new and useful Improvements in Systems for the Transmission of Intelligence.

This invention relates to systems for the transmission of intelligence, in which the amplitudes of successive electricalnoscillations of high frequency are varied in acr frequency forms of the messages delivered. I

Its object is to simplify the mechanism and to strengthen the efiectiveness of the" apparatus required for the production of the modulated oscillations.

- To these ends the invention embodies a repeater which serves not only as a generator of high frequency oscillations, but also as a means for modulating the oscillations in accordance with the low frequency signaling impulses to be transmitted.

The invention is adapted for embodiment in systems of wireless telegraphy and telephony in so-called high frequency wired systems, and in general wherever a receiving devlce s rendered sensltlve to signaling 1mpulses'or waves of low frequencies by means of sustained electric. or electromagnetic waves of high frequency transmitted from the sending station.

The single device used to perform the two functions referred to may be a repeater, preferably a repeater of the audion type,

wherein the output circuit is connected with resulting in the production of sustained high the input circuit, this arrangement, with proper adjustment of devices in the circuit,

frequency oscillations. By varying the potential in the input circuit, asforexample by connecting a transmitter or other device for sending a message in-circuit with one of the electrodes, say the grid, of the audion, the sustained oscillations, it has been found, are then modulated in accordance with the message to be sent. The message may be" received or recorded in any desired manner:

at the distant station. I Y

Several embodiments of the invention will be set forth in the following detail description taken in connection with the accompanying drawings, wherein a Figure 1 illustrates a system of circuits Serial No. 160,871.

' embodying the invention; and Figs. 2, 3 and ated vessel, as usual, is arranged with its output anode or plate 2 connected through the primary windings 3 and, 4 of repeating coils-5 and 6 to the negative'terminal ofthe heated filament or cathode 7 of the audion. Included in this output circuit 'may be-located a battery 10 and, as required, adjust ,able devices such as the condensers 8 and 9.

Bridged across the circuit, to feed battery current to the plate 2, is a coil of high impedance 11. The filament 7 isheated by current from the battery 12. The input electrode or grid 13 of the audion is connected I through the secondary winding 1 1 of a repeating coil 15to the negative terminal 0M the filament 7, and included in this, the input circuit, there may be located a battery- 16. The secondary winding 17 of the repeating-coil 6 isconnected through an adjustable condenser 18 with the input circuit,

one wire leading to the grid 13 and the other wire to the negative terminal of the filament 7.

The primary-winding 19 of the repeating, coil 15 may be connected in circuit with the,

secondary winding 20 of another repeating If coil 21, the primary winding 22-01? which,

.is connected in circuit with a battery 23 and a sendingdevice, which, as shown, may be a telephone transmitter 24:. The repeating coil 5 has a secondary winding 25, the tor- ,minals of which lead to the antenna of a wireless system or to the line of a wire circuit, according to the particular use .to which the apparatus is put.

. The operation of the system illustrated in Fig. 1 is as follows: The audion 1 is rendered active by the heated filament 7, which emits a stream of negative ions across the space interyening between it and the positive] charged plate 2. This stream passses throng the interspaces of the grid. The battery 10,

acting through the resistance of the coil 11,

tends to'maintain a steady flow of current 'in the output circuit, including the ionized I the amplitude of the sustained oscillations condensers in the circuit.

frequency.

fluctuate at a very high frequency,by reason of the :interaction between the input and output circuits through the repeating coil 6. The frequency of the sustained oscillations produced by this arrangement may bevaried by adjusting the capacities of the various The high frequency currents in the output circuit are transmitted by the repeating coil 5 into the line or antenna to which the secondary winding, 25 may be connected.

By means of the telephone transmitter 24,

is modified or modulated in accordance with sound waves which are of a lowerorder of This may be explained as follows At the normal potential of the battery '16 impressed on the grid 13, the sustainedv oscillations are produced at a constant amplitude. At a higher potential, due to a positive impulse from the winding 14, the current in the output circuit is increased, and theamplitude of the high frequency oscillations is greater. Conversely, at a lower potential, due to a negative impulse,

the oscillations become lesser in amplitude than normal. Thus each pulsation of potential, caused by speaking into the transmitter 24, is effective in producing a cor-" responding variation in the amplitude of oscillations of current, and .therefore of energy in the output circuit and likewise in the line or antennii.

In Fig. 2 is shown an arrangement differing from that of Fig. 1 in that the battery 10 thereof, corresponding to the like numbered battery in Fig. 1, is connected in se ries with the high impedance coil 11 in bridge of the output circuit. Thearrangement is also different in that the battery 16 is included in a bridge of the input circuit in series with an adjustable resistance 26.

In Fig. 3 is illustrated a modified circuit in which the battery 10 is included in series with the high'impedance coil 11 as it is in Fig. 2, but primary windings 3 and 4 of the repeating coils 5 and 6 are connected in parallel with relation to each other instead the battery 10 is connected to a central point in the winding of the high impedance coil 11, the outer terminals of which are connected to the two platesfl and 2", respectively, a

of the two audions. Battery 16 is likewise connected to a midpoint of an adjustable resistance 26, the outer terminals of which are connected to the two grids 13 and 13".

In the system of Fig. 4, therefore, the battery "10 tends to supply a steady how of current through both a-udions from the plates 2* and 2 to the .two filaments 7 and 7", respectively. The battery 12 supplies'current to. both of the filaments 7 and 7 The ophigh produced;

1. The combination with a vacuum tube having a filament, a plate and a grid, an input circuit connected with the grid and an output circuit connected with the plate; of means for impressing sustained high frequency oscillations on said input circuit; and

a source of low frequency potential variations connected to said input circuit, said output circuit comprising means for supplying modulated high frequency oscillations.

2. The combination with a vacuum tube, I,

having a filament, a plate and a grid, an input circuit connected with the grid and an .output circuit connected with the plate; of

means for impressing sustained high frequency oscillations on said input circuit, and signaling means associated with said tube, said output circuit comprising means for supplying high frequency oscillations modulated in accordance with the signal.

3. The combination with a generator of high frequency oscillations, comprising a repeater of the feed-back type and an input and an output circuit connected to each other to produce sustained high-frequency with low frequency signaling impulses.

oscillations, of means for modulating said" 4'. The, combination with. a generator of high frequency oscillations, comprising a vacuum tube repeater of the audion type and input and an output circuit therefor arranged to react upon each other to produce sustained high-frequency oscillations, of" a means for modulating said high frequency oscillations in accordance with low frequency signaling impulses, and a transmission circuit for receiving the modulated frequency oscillations.

peater having an input andan output cir- The combination with a generator of high frequency oscillations, comprising a re- .cuit. connected with each other for produc-- ing sustained high-frequency oscillations, of

a source oflow frequency potential variations, and circuit connections by which said low frequency potentialvariations vary the amplitude of said high frequencybscillaj tions.

f 6. The combination of a vacuumtube repeater of the audion type adapted to gencrate sustained high frequency oscillations,

with means for modulating said oscillations in accordance with a telephone signal to be transmitted, and means for transmitting the modulated high frequency oscillations so 13v quency oscillations, a thermionic device of the audion type for modulating high frequency oscillations in accordance with low frequency signals, said device having an input and an output circuit, said'inp'ut circuit comprisinga heated filament and a controlling electrode, means for generating low frequency signals, and means for impressing 19 said low frequency signals upon the input circuit of said device. 8. In a system for signaling by high frequenc oscillations, a thermionic devlce for modu ating said high frequency oscillations in accordance with low frequency signals, said device comprising an evacuated vessel containing a filament, an auxiliary electrode and a plate element, and means for changing the potential of the auxiliary electrode 13 with respect to the filament in accordance with low frequency signals to be transmitted.

9. In a system for signaling byhigh frequency oscillations, a thermionic device for modulatingsaid high frequency oscillations in accordance with low frequency signals,.

10. In a system for signaling by high he quency oscillations, a thermionic device for modulating said high frequency oscillations in accordance with low frequency signals,

said device comprising an evacuated Vessel containing a filament, a grid and a plate element, means for generating low frequency signals, and means for-simultaneously impressing on said grid the high frequency oscillations and the low frequency signaling impulses.

v 11. A signaling system comprising an audion having filament, 'd and plate electrodes, means for suppdy ing high frequency oscillations to said audion, signaling means associated with said audion, and a "'circuit connected to said plate and said filament electrodes for leading off from said audion high frequency oscillations modu- .lated in accordance with said signal.

12. A signaling system comprising an audion having filament, grid and plate electrodes, means for supplying high frequency oscillations, means for supplying signaling oscillations, means comprising said audion for modulating said high frequency oscillations in accordance with said signaling 05- cillations, and a circuit connected to said 'filament and plate electrodes for leadin off the modulated oscillations from said audion. 13. The combination with a generator of high -frequency current, comprising a re- 6 peater and an input and an output circuit each other; of means included in said cirtherefor united with each other, said repeater having an electrode located in said input circuit; of a transmission line united with said output circuit, and a source of 'low frequency potential variations connect-v ed to said electrode.

14:. The combination With an audion havinga' filament, a plate and a grid, aninput circuit connected with the grid and an output circuit connected with the plate; of an 5 inductive connection between said output and said input circuits'ada ted to the production by said audion o sustained high frequency oscillations, and a sending device, adapted for producing signaling impulses 30 of low frequencies, connected with said input circui p 15. The combination with a generator of high frequency current, comprising a repeater, an input and an output circuit there- 5 for and a connection between said circuits; of a transmission line united with said output circuit,-- and a sending device, adapted for producing signaling impulses of low frequencies, connected with said input cir- 0 cuit.

16. The. combination with a generator of high frequency current, comprising an evacuated vessel, means for producing a state of ionization in said vessel, and an input and an output circuit interconnected to react upon each other; of means connected with said input circuit for producing low frequency potential variations in said input circuit.

17 The combination with a generator of high frequency current, comprising an evacuated vessel, means for producing a state of ionization in said vessel, and an input and an output circuit inductively connected with each other; of a source of low frequency potential variations connected with said input circuit for controlling the amplitude of the high frequency currents developed by said generaton 18. The combination with a generator of high frequency current, comprislng an evacuated vessel, means for producing a state of ionization insaid vessel, and an input and an output circuit connected with cuits for adjusting the frequency of said current; and a source of low frequency potential variations connected with said input circuit for controlling the amplitude of the high frequency currents developed by said generator.

19. In apparatus of the kind described, the combination of an evacuated vessel and means, including a cathode, for producing a state of ionization in said vessel;'of an input anode and ,an output anode in said vessel; an output circuit connected to said output anode and including an adjustable condenser and a source of continuous current, an input circuit connectedtosaid input anode and inductively connected to said output circuit, and means connected with said input circuit for producing low fre- 5 quency potential variations in said input circuit.

20. The combination with an au'dion hav ing an input circuit and anv output circuit inductively connected with each other; of

means connected with said input circuit for 15 producing low frequency potential viiriht ions-in said input circuit. I

In witne$ whereof, I hereunto subscribe. I my name this 12th day of March,19l7.

' EDWIN H. COLPITTS.

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