US1466263A - High-frequency signaling system - Google Patents

Description

Aug. 28, 1923. 1.466263 E. F. W. ALEXANDERSON HIGH FREQUENCY SIGNALING SYSTEM Filed April 10 1922' 3 1 WNW 3 AP' His A'C'Cor'qfay Patented Aug. 28, 1923.

ire states titans ERNST F. W. ALEXANDERSON, OF SCHENECTADY, NEW YORK, ASSIGNOR TO GENERAL 7 ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

nronrnnennncv srenemne SYSTEM.

Application filed April 10, 1922. Serial No. 550,948.

To all whom it may concern:

Be it known that I, ERNST F. W. ALEX- ANDERSON, a citizen of the United States, residing at Schenectady, in the county of Schenectady State of New York, have invented certain new and useful Improvements in High-Frequency Signaling Systoms, of which the following is a specification.

My present invention relates to high-frequency signaling systems and more particularly to systems for producing interrupted continuous high frequency signalingfcurrents. l

The object of my invention is to provide a simple and eiiicient method and apparatus 7 for producing interrupted continuous waves which will be particularly adapted for effective transmission of radio telegraphic signals.

In carrying my invention into effect, I employ an electron dischargedevice of the well known three electrode type and arrange this in-such a way that it will be capable of producing oscillations of both audio and radio frequency. The apparatus is further adjusted and'arranged in such a way that high frequency oscillations will be produced only during a portion of each cycle of the audio frequency oscillal'atus the high frequency oscillations produced may be made of substantially constant amplitude during the period when they are being produced, High frequency oscillations produced in accordance with my invention because of the fact that they have a high decrement are more etlicient for the transmission of signals than modulated high frequency oscillations such as have been produced in ways heretofore proposed for producing modulated high frequency oscil-' lations bywaves of an"electron discharge device.

The novel features which I believe to be characteristic of my invention are set forth with particularity in the appended cla ms,-

my invention itself however both as to its organization and mcthoduof operation will best be understood by reference to the following description taken'in connection with istics By proper adjustment of the appa-' the accompanying drawing in which I have indicated diagrammatically one way of 'carrying'my invention into effect.

I have indicated in the drawing an electron discharge dcvlce 1 of the usual threeelectrode" type. A supply circuit which in cludes a source of current 2 and inductances 3 and L is connected between the cathode 5 and anode 6. A highfrequency oscillating circuit associated with the device 1 comprises an inductance 7 in circuit with the" 12. The grid circuit also includes a low frequency oscillating circuit made'up of capacity 13 and inductance 1 1, "which is" It will be apparent that with the arrange-' mentdcscribed when so adjusted as to produce low frequency oscillations the potential of the grid varies at the audio frequency'of the low frequency oscillations generated. character- If the device has suitable or the normal grid potential is adjusted to the proper value high frequency oscillations will be produced only during a portion of each cycle of the low frequency oscillations, I by suitable adjustment be made to be all of the positive half cycle, a part only of the positive half cycle.v or all of the positive half cycle and part of the negative.

point at which high frequency oscillations start may be made quite critical and the high frequency 'OSClllltlOflS will quickly build up to their maximum amplitudeand continue at substantially constant amplitude during theentire period during which they are produced. A high frequency wave- I am aware that it has heretofore been proposed to produce modulated high frequency oscillations by means of a single 'electron'discharge device. In none of the This 7 portion may lVith the arrangement which I have described the Cir systems which have been proposed for this purpose of Which- I am aware, however, have any means been provided for limiting the amplitude of the audio frequency oscillations in proportion to the amplitudeof the radio frequency oscillations and there has been a general tendency in such systems for the audio frequency oscillations to rise in.

amplitude at the expense of the high fre quency oscillations. In the system which I havedescribed, however, .it is apparent that the amplitude of the audio frequency oscil lations will be limited bythe amplitude of the radio frequency oscillations as the am plitude'of' the audio frequency oscillations is entirely dependent upon the amount of energy which is supplied to the tube and the greater part of this energy is converted into high frequency oscillations.

l/Vhi-le I have shown and described the preferred embodiment of my invention it is apparent that many modifications in the circuit arrangement employed for carrying out my invention may be made without de parting from the-scope of. my invention as set forth in the appended claims.

What I claim as new and desire to secure by Letters Patent of the United States, is

1. Av system for producing interrupted continuous Waves comprising an electron discharge device having a cathode, an anode, andia grid, a supply circuit connectingthe cathode and anode-and containing a source of current, a high frequency oscillating circuit in shunt to said supply circuit and coupled by capacity to a grid circuit, and a I of current, a radiating antenna,

quency oscillating circuit associated with a low frequency oscillating circuit associated with the grid circuit and inductively coupled to the supply circuit.

2. A system for producing continuous waves comprising interrupted an electron discharge device having a cathode, an anode and a grid, a supply circuit connecting the cathode and anode and containing a source a high frothe cathode and anode independent of said supply circuit, and with said antenna and coupled by capacity to a grid circu t and a low frequency oscillating circuit associated 4 with the grid circuit and inductively cou- 1 low frequency oscillations.

pled to the supply circuit.

3. The'rnethodof producing interrupted continuous waves by means of an electron discharge device which consists in generating low frequency continuous oscillations by means of said device and generating high frequency oscillations during the positive portions only of the individual cycles of the 4. The method of producing an electron in generatillations by discharge device. which consis s, i-ng low frequenc continuous means or said dc interrupted as ria frequency oscillations during a portion only of each individual cycle of the low frequency oscillations.

5. The method of producing interrupted continuous waves by means of an electron discharge device which consists in generating low frequency continuous oscillations by means of said device and generating h gh frequency oscillations during a portion only c discharge oscillation generator which, consistsin generating both high frequency and low frequency oscillations thereby.- and limiting the amplitude of the low frequency oscillations by the amplitude ofthe high frequency oscillations.

.- 7]. The method of; operating an electron discharge oscillation generator which con-.

sists. in generating high frequency oscillations thereby and generatinglow frequency oscillations thereby which are limitedin amplitude by the amplitude'of the high frequency oscillations.

8. A system for producing interrupted? continuous waves comprising an. electron discharge device having a cathode, an anode and. a grid, a supply circuit connecting the cathodeand anode and containing a source during the PGIIOClS' of current, a high frequency oscillating cir- (-iiit in shunt to said supply circuit, a grid circuit, and a low frequency oscillating circuit associated-withthe grid circuit and inductively coupled to the supply circuit.

9.1%, system for producing interruptedcontinuous waves comprising an electron discharge device having a cathode, an anode and a grid, a supplycircuitconnecting the cathode and anode and containing a source oiicurrent, a radiating antenna, a high he quencyoscillatingcircuit associated with the cathode and anode independent of said supply circuit, and with said antenna, av grid circuit and a low frequency oscillating ciruit associated with the grid circuit and inductively coupledto the-supply circuit.

10. ii system. for producing high frequency oscillations coiuprising an electron discharge device having a cathode, an anode and a grid, a supply circuit connectingthe:

cathode and anode, a high frequencyosrillating circuit associated with said device in such a Way that high frequency oscillations will be produced therein, and low frequency oscillatingcircuit associated with. said supply circuit n such a Way that low frequency oscillations wilhbe produced therein of an amplitudeproportional 'to the energy supplied to thedevice.v

ii; A s stem for producing highquency; 939 i"i.iiiin fiiiiilfil)ii"i31g"; an

iven free discharge device having a cathode, an anode frequency oscillations will be produced and a grid, a supply circuit connecting the therein of an amplitude proportional to the 10 cathode and anode, a high frequency oscilamplitude of the high frequency oscillations lating circuit associated with said device in produced.

- such a Way that high frequency oscillations In Witness whereof, I have hereunto set Will be produced therein, and a low fre my hand this 8th day of April, 1922. quency oscillating circuit associated With said supply circuit in such a Way that low ERNST F. ALEXANDERSON.

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