US2456016A - Keyed oscillator - Google Patents

Keyed oscillator Download PDF

Info

Publication number
US2456016A
US2456016A US554382A US55438244A US2456016A US 2456016 A US2456016 A US 2456016A US 554382 A US554382 A US 554382A US 55438244 A US55438244 A US 55438244A US 2456016 A US2456016 A US 2456016A
Authority
US
United States
Prior art keywords
grid
pentode
resistor
condenser
ground
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
US554382A
Inventor
Robert P Owen
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.)
Allen B du Mont Laboratories Inc
Original Assignee
Allen B du Mont Laboratories Inc
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 Allen B du Mont Laboratories Inc filed Critical Allen B du Mont Laboratories Inc
Priority to US554382A priority Critical patent/US2456016A/en
Application granted granted Critical
Publication of US2456016A publication Critical patent/US2456016A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/04—Modulator circuits; Transmitter circuits

Definitions

  • This invention relates to a vacuum tube oscillator by which trains or bursts' of oscillations, either sinusoidal or oi othery shapes, can be suddenly initiated and' caused to continue for predetermined intervals of time,Y and their be'suddenly,
  • reference character I indicates the vacuum tube of a transitron oscillator which is provided with a plate 2, cathode 3, and three grids 4, and 6, the grid B being grounded.
  • a resistor I is provided between a source of positive potential B and the plate 2.
  • a resistor 8 is provided between the plate 2 and ground with -a condenser 9 in parallel with the resistor 8.
  • variable resistor IIl is provided between the cathode 3 and ground with a condenser II in parallel with it.
  • a condenser I2 is connected between the grids 4 and 5 and a resistor I3 is located between grid 4 and ground.
  • ⁇ grid 5 constitutes th'e tank circuit of this grid and controls the frequency of oscillations of the tube I in the known way.
  • the output lead from the oscillator I is indicated' by I6.
  • a lead I1 is connected from the lead I6 to the plate I8 of the triode I9 which is the keying tube for the device. It has its cathode 28 biased by resistor 2l with which the condenser 22 is in parallel.
  • the keying pulse 24 is coupled by condenser 25 tothe control grid 26 of the tube I9.
  • This grid 2B is connected to ground through resistor 21.
  • the pentode I is connected yas shown as a transitron oscillator. It has been found, for example, that the device Aoperates very satisfactorily when the resistor ID is adjusted-to be about 300 ohms and the potential B-iis about 85 volts.
  • a wide range of frequencies of oscillation of the oscillator I can be obtained by changing the condenser I4 or inductance I5,r It has been found misst-36 'cause of the low alternating current plate to cathode resistance of tube I9, which isfeflectively acrossfthe tank coil I5.
  • the resistor 2l prevents y:excessive current. through tube I9. fr f, However, when anegative pulse as indicated at 241s. appliedv to the control grid 26 )of tube I8,
  • a device for producing bursts of electrical oscillations which comprises a pentode that has its control grid grounded and its cathode connected to ground through a resistor, a condenser and inductance in parallel connected between a source of positive potential and the screen grid of said pentode, a resistor between the suppressor grid of said pentode and ground and a condenser between the screen grid and suppressor grid of said pentode to cause said pentode to oscillate when positive potential is applied to its plate, a triode adapted to be blocked when a pulse of negative potential is applied to its control grid, the plate of said triode being connected directly to said screen grid and its cathode connected to ground through a resistor.
  • a d evice for producing bursts of electrical oscillations which comprises a pentode that has its control grid grounded and its cathode connected to ground through a resistor, a condenser and inductance in parallel connected between a source of positive potential and the screen grid of said pentode, a resistor between the suppressor grid of said pentode and ground and a condenser between the screen grid and suppressor grid of said pentode to cause said pentode to oscillate ywhen positive potential is applied to its plate, a
  • triode adapted to be blocked when a pulse of negative potential is applied to its control grid, the plate of said triode being connected directly to said screen grid, and separate resistors conbetween the screen grid and suppressor grid of said pentode to cause said pentode to oscillate when positive potential is applied to its plate, a triode adapted to be blocked' when a :pulse of negative potential is applied to its control grid, the plate of said triode being connected directly to said screen grid, and separate resistors connecting the cathodes of said pentode and triode respectively to ground and a condenser in parallel with each resistor.
  • a device for producing bursts of electrical oscillations which comprises aperitode that has its control grid grounded and its cathode connected to ground through a resistor, a condenser and inductance in parallel connected between a source of positive potential and the screen grid of said pentode, a resistor between the suppressor grid of said pentode and ground and a condenser between the screen grid and suppressor grid of said pentode to cause said pentode to oscillate when positive potential is applied to its plate, a triode adapted to be blocked when a pulse of negative potential is applied to its control grid, the plate of said triode being connected directly to said screen grid, a variable resistor between the cathode of said pento'de andg'groudand a re.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Description

Dec. 14, 1948. R.' P. OWEN I KEYED OSCILLATOR Filed sept. 1e, 1944 W INVENTOR.
Patented Dec. 14, 1948 B. DuMont Laboratories, Inc.,Passai'c,
a'corporationfDelawarej 1 Apllicationseptember 16,1?944, serial-Nassijsz This invention relates toa vacuum tube oscillator by which trains or bursts' of oscillations, either sinusoidal or oi othery shapes, can be suddenly initiated and' caused to continue for predetermined intervals of time,Y and their be'suddenly,
stopped. With `this invention.;l the initationiwof the oscillations and the stopping of the'sameis under the control of another vacuum tube and may be done by means of a pulse of electrical energy that may be termed keying pulse.
The invention may be understood from the description in connection with the accompanying drawing, which is a diagram of connections showing an illustrative embodiment of the invention.
In the drawing, reference character I indicates the vacuum tube of a transitron oscillator which is provided with a plate 2, cathode 3, and three grids 4, and 6, the grid B being grounded.
A resistor I is provided between a source of positive potential B and the plate 2. A resistor 8 is provided between the plate 2 and ground with -a condenser 9 in parallel with the resistor 8. A
variable resistor IIl is provided between the cathode 3 and ground with a condenser II in parallel with it. A condenser I2 is connected between the grids 4 and 5 and a resistor I3 is located between grid 4 and ground.
`grid 5 constitutes th'e tank circuit of this grid and controls the frequency of oscillations of the tube I in the known way.
The output lead from the oscillator I is indicated' by I6. A lead I1 is connected from the lead I6 to the plate I8 of the triode I9 which is the keying tube for the device. It has its cathode 28 biased by resistor 2l with which the condenser 22 is in parallel.
The keying pulse 24 is coupled by condenser 25 tothe control grid 26 of the tube I9. This grid 2B is connected to ground through resistor 21.
The operation is as follows:
The pentode I is connected yas shown as a transitron oscillator. It has been found, for example, that the device Aoperates very satisfactorily when the resistor ID is adjusted-to be about 300 ohms and the potential B-iis about 85 volts. A wide range of frequencies of oscillation of the oscillator I can be obtained by changing the condenser I4 or inductance I5,r It has been found misst-36 'cause of the low alternating current plate to cathode resistance of tube I9, which isfeflectively acrossfthe tank coil I5. The resistor 2l prevents y:excessive current. through tube I9. fr f, However, when anegative pulse as indicated at 241s. appliedv to the control grid 26 )of tube I8,
@this tube: .ceases to conduct, thus causingr itsr plate towcathod'e impedance. to become very/ high, whereupon the oscillator I begins to oscillate instantly at the frequency determined by the grid or bursts of oscillation, whether of sinusoidal or l other forms, can be suddenly initiated, prolonged for different intervals of time, and immediately extinguished merely by applying the appropriate signals to the grid of tube I9.
What is claimedy is:
1. A device for producing bursts of electrical oscillations, which comprises a pentode that has its control grid grounded and its cathode connected to ground through a resistor, a condenser and inductance in parallel connected between a source of positive potential and the screen grid of said pentode, a resistor between the suppressor grid of said pentode and ground and a condenser between the screen grid and suppressor grid of said pentode to cause said pentode to oscillate when positive potential is applied to its plate, a triode adapted to be blocked when a pulse of negative potential is applied to its control grid, the plate of said triode being connected directly to said screen grid and its cathode connected to ground through a resistor.
2. A d evice for producing bursts of electrical oscillations, which comprises a pentode that has its control grid grounded and its cathode connected to ground through a resistor, a condenser and inductance in parallel connected between a source of positive potential and the screen grid of said pentode, a resistor between the suppressor grid of said pentode and ground and a condenser between the screen grid and suppressor grid of said pentode to cause said pentode to oscillate ywhen positive potential is applied to its plate, a
triode adapted to be blocked when a pulse of negative potential is applied to its control grid, the plate of said triode being connected directly to said screen grid, and separate resistors conbetween the screen grid and suppressor grid of said pentode to cause said pentode to oscillate when positive potential is applied to its plate, a triode adapted to be blocked' when a :pulse of negative potential is applied to its control grid, the plate of said triode being connected directly to said screen grid, and separate resistors connecting the cathodes of said pentode and triode respectively to ground and a condenser in parallel with each resistor.
4. A device for producing bursts of electrical oscillations, which comprises aperitode that has its control grid grounded and its cathode connected to ground through a resistor, a condenser and inductance in parallel connected between a source of positive potential and the screen grid of said pentode, a resistor between the suppressor grid of said pentode and ground and a condenser between the screen grid and suppressor grid of said pentode to cause said pentode to oscillate when positive potential is applied to its plate, a triode adapted to be blocked when a pulse of negative potential is applied to its control grid, the plate of said triode being connected directly to said screen grid, a variable resistor between the cathode of said pento'de andg'groudand a re..
sistor between the cathode of -said triode and ground.
` ROBERT P. OWEN.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,839,650 Cook Jan. 5, 1932 2,088,229 Braden July 27, 1937 2,213,398 Kircher Sept. 3, 1940 2,273,193 Helsing Feb. 17,1942
OTHERl REFERENCES The Transitron Oscillator, by Cledo Brunetti, Proceedings of the I. R. E., pages 88-93. Copy in Library.
US554382A 1944-09-16 1944-09-16 Keyed oscillator Expired - Lifetime US2456016A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US554382A US2456016A (en) 1944-09-16 1944-09-16 Keyed oscillator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US554382A US2456016A (en) 1944-09-16 1944-09-16 Keyed oscillator

Publications (1)

Publication Number Publication Date
US2456016A true US2456016A (en) 1948-12-14

Family

ID=24213119

Family Applications (1)

Application Number Title Priority Date Filing Date
US554382A Expired - Lifetime US2456016A (en) 1944-09-16 1944-09-16 Keyed oscillator

Country Status (1)

Country Link
US (1) US2456016A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2609512A (en) * 1946-10-30 1952-09-02 Bendix Aviat Corp Frequency meter
US2610294A (en) * 1945-06-13 1952-09-09 Seddon John Carl Vacuum tube keying circuit
US2659009A (en) * 1945-05-17 1953-11-10 Alfred G Emslie Electronic oscillator synchronizing circuit
US2748285A (en) * 1949-04-15 1956-05-29 British Telecomm Res Ltd Start-stop oscillator
US2807781A (en) * 1953-01-08 1957-09-24 Servo Corp Of America Direct-reading frequency meter
US2905907A (en) * 1956-09-04 1959-09-22 Hughes Aircraft Co Gated coherent oscillator
US3150232A (en) * 1961-02-06 1964-09-22 Edward R Schmidt Variable damping circuits

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1839650A (en) * 1926-10-30 1932-01-05 John W Cook Transmitter system
US2088229A (en) * 1933-07-29 1937-07-27 Rca Corp Automatic fidelity control circuit
US2213398A (en) * 1938-07-22 1940-09-03 Bell Telephone Labor Inc Vacuum tube circuit
US2273193A (en) * 1938-10-07 1942-02-17 Bell Telephone Labor Inc Wave transmission and shaping

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1839650A (en) * 1926-10-30 1932-01-05 John W Cook Transmitter system
US2088229A (en) * 1933-07-29 1937-07-27 Rca Corp Automatic fidelity control circuit
US2213398A (en) * 1938-07-22 1940-09-03 Bell Telephone Labor Inc Vacuum tube circuit
US2273193A (en) * 1938-10-07 1942-02-17 Bell Telephone Labor Inc Wave transmission and shaping

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2659009A (en) * 1945-05-17 1953-11-10 Alfred G Emslie Electronic oscillator synchronizing circuit
US2610294A (en) * 1945-06-13 1952-09-09 Seddon John Carl Vacuum tube keying circuit
US2609512A (en) * 1946-10-30 1952-09-02 Bendix Aviat Corp Frequency meter
US2748285A (en) * 1949-04-15 1956-05-29 British Telecomm Res Ltd Start-stop oscillator
US2807781A (en) * 1953-01-08 1957-09-24 Servo Corp Of America Direct-reading frequency meter
US2905907A (en) * 1956-09-04 1959-09-22 Hughes Aircraft Co Gated coherent oscillator
US3150232A (en) * 1961-02-06 1964-09-22 Edward R Schmidt Variable damping circuits

Similar Documents

Publication Publication Date Title
US2185363A (en) Thermionic valve circuits
US2662981A (en) Wave form generating circuits
US2492018A (en) Synchronizing system for sawtooth wave generators
US2409577A (en) Synchronized blocking oscillator
US2456016A (en) Keyed oscillator
US2419772A (en) Pulse generator system
US2596167A (en) Signal generating device
US2461144A (en) Electrical storage device
US2508879A (en) Sweep voltage generator
US2470573A (en) Oscillator modulating system
US2420509A (en) Electron computing device
US2589240A (en) Double pulse generator
US2589807A (en) Electrical integration circuit
US2779870A (en) Amplitude comparison circuit
US2689299A (en) Pulse selector circuit
US2644094A (en) Pulse generator
US2437970A (en) Pulse communication
US2429844A (en) Pulse delay circuits
US3217271A (en) Variable sweep generation amplitude control
US2547523A (en) Electronic pulse generator
US2555175A (en) Automatic frequency control system
US2590836A (en) Plate keyer for radar transmitters
US2775694A (en) Electrical circuit arrangements for effecting integration and applications thereof
US2826694A (en) Free-running multivibrator
US2467834A (en) Oscillograph apparatus