US2419569A - Radio receiver - Google Patents

Radio receiver Download PDF

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Publication number
US2419569A
US2419569A US488181A US48818143A US2419569A US 2419569 A US2419569 A US 2419569A US 488181 A US488181 A US 488181A US 48818143 A US48818143 A US 48818143A US 2419569 A US2419569 A US 2419569A
Authority
US
United States
Prior art keywords
circuit
pulse
oscillating
multivibrator
impulses
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
US488181A
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English (en)
Inventor
Labin Emile
Donald D Grieg
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.)
STC PLC
Federal Telephone and Radio Corp
Original Assignee
Standard Telephone and Cables PLC
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
Priority to BE480693D priority Critical patent/BE480693A/xx
Priority to FR57767D priority patent/FR57767E/fr
Priority to BE481275D priority patent/BE481275A/xx
Priority to NL137189D priority patent/NL137189C/xx
Priority to NL137188D priority patent/NL137188C/xx
Priority to US488181A priority patent/US2419569A/en
Priority to US488183A priority patent/US2419570A/en
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB20199/44A priority patent/GB600255A/en
Priority to GB1233/45A priority patent/GB600259A/en
Application granted granted Critical
Publication of US2419569A publication Critical patent/US2419569A/en
Priority to FR951075D priority patent/FR951075A/fr
Priority to ES0182493A priority patent/ES182493A1/es
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K9/00—Demodulating pulses which have been modulated with a continuously-variable signal
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B13/00—Special devices for ventilating gasproof shelters

Definitions

  • This invention relates to radio receiving circuits and more particularly to radio circuits for translation of radio frequency pulses.
  • intelligence may be transmitted through wire or space by modulating a carrier wave in the form of a train of pulses wherein the intelligence is represented by variation in time such, for example, as Variations in the time interval between pairs of pulses called double pulse modulation.
  • the duration of th'e pulses of the double pulse modulated wave are usually constant and small compared with the time intervals between adjacent pulses.
  • the pulses are preferably of equal amplitude and the modulation is deter-v mined solely by time displacement.
  • Another object of our invention' is to provide a radio receiver for time modulated pulse reception which is relatively simple and which requires only a small number of parts.
  • Still another object of ourinvention is to provide a single translation stage for translating time modulated pulse carrier waves into a train of time modulated impulses having an unusually large gain and a high signal-to noise ratio.
  • a triggerable oscillating circuit having an output of impulses corresponding in occurrence to the pulse occurrence of a time modulated carrier wave or other time modulated pulse source applied thereto.
  • the oscillating circuit is adjusted for normal interval operation at a frequency lower than the unmodulated frequency of a given carrier wave or other pulse source.
  • the pulses of the source control the oscillation intervals of the circuit, and by providing a local pulse generator such as a multivibrator which is in turn controlled by the oscillation intervals of the oscillating circuit, rectangular impulses of constant predetermined duration having occurrence variations corresponding to th'e pulse occurrence of the carrier wave are produced.
  • the rectangular impulses of the multivibrator may in turn be applied to the control circuit of the oscillating circuit to increase the sensitivity and stability thereof during the operating intervals thereof.
  • T. M. (time modulation) demodulator such, for example, as disclosed in U. S. Patent to Reeves 2,266,401, or the copending application of D. D. Greig Serial No. 459,959, led September 28, 1942.
  • the demodulation of the pulses translates the intelligence represented by the time variations thereof into corresponding amplitude variations which' may b
  • Fig. 1 is a block diagram of one form of T. M. (time modulation) receiver in accordance with our invention
  • Fig. 2 is a schematic wiring diagram of the oscillating trigger circuit of the embodiment shown in Fig. 1;
  • Fig. 3 is a graphical illustration showing the translation operations of the circuit of Fig. 2;
  • Fig. 4 is a schematic wiring diagram of another embodiment of our invention showing a simplied translating circuit
  • Fig, 5 is a graphical illustration showing the operating steps of the circuit in Fig. 4.
  • the T. M. receiver therein shown for purposes of illustration includes the usual antenna I Il, an oscillating trigger circuit I'2, a multivibrator circuit I4 and a T. M. (time modulation) demodulator I6.
  • the oscillating circuit I2 controls operation of the multivibrator I4 and the multivibrator furnishes a feed-back voltage to the oscillating circuit.
  • the normal operation of the oscillating circuit produces intervals or groups of oscillations and the occurrence of each group operates to trigger the multivibrator I 4 from a rst state of operation to a second state of operation from which it is adapted to return to the rst state after a predetermined interval.
  • This operation of the multivibrator produces a voltage impulse of rectangular form which is fed back to the oscillating circuit to increase the sensitivity and stability thereof during its operating intervals.
  • the multivibrator pulses correspond in occurrence with the pulse occurrence of the modulated carrier wave and their duration may be controlled independently of the operating interval of the oscillating circuit. Either the multivibrator pulses'or the average voltage pulse of the operating interval of the oscillating circuit may be applied to the demodulator I 6 by selective operation of the switch I'I with respectto connecljtions i9 and 31.
  • an L-C resonant circuit is tuned to a particular carrier wave the R. F. energy of which is obtained from the antenna coupling coil lo.
  • the oscillating circuitlZ is provided with a vacuum tube having an anode 2l, a control grid 22, a cathode 23 and a screen grid 24. Gne side of the L-C circuit is oonnected through a blocking condenser 25 to the grid 22. The opposite side 2l of the L-C circuit is grounded.
  • the cathode 23 is connected to the coil L at 28.
  • the screen grid 24 is connected to ground through a condenser 3E! for by-passingthe radio frequency energy.
  • the screen grid isV alsoconnected to a movable contact of a potentiometer 32l which is supplied with' positive energy from a battery terminal 34.
  • the plate output circuit 35j is ⁇ fconnected across a load resistance S to the battery terminal 34.
  • 'I he multivibrator I4r is of known character having onestate of operation from which it is capable ot beingY triggered to-a secondstatey of operationfrom'which it will return after a given intervalof time to the rst stateof operation.
  • the 'output ofthe multivibrator is preferably used asthe time modulation output impulses since the duration thereof can-be controlled independently O'th'eoperating interval of the oscillating circuit o f tube 2G.
  • the sensitivity of thetube is greatly increased during the operating interval thereof.
  • the resistorY R1 is preferably high to-providea'high impedance to the R. F. energy of the grid circuit. I'fndvesiredthe feed-back connectionV maybe made to the screen grid 24 in place of grid- 22;
  • curve ciA represents a period A ofvnor mal operation in absence of input signals and a, ⁇
  • Curve b representsgenerally the gridvoltage of gridNZZ during the periods representedV by curve a.
  • Curves c, eiland e represent respectively, the
  • the operation ofthe oscillating circuitl ⁇ mand the multivibrator I4 may loe described v as-follorws. ⁇
  • oscillationsr will be initiated by thermail orrandom-noise voltage fluctuations such as indicated lat 4i..
  • the oscillations build-up rapidly as indicated by curved and trigger themultivi'- brator ⁇ ⁇ 4g-from one statelof operation-to a second state of operation thereby producing at the outputthereof a pulse 42' (curve c) of rectangularv 45- of! curvee.
  • The-oscillating yinterval and' there- I fore the envelopes 45 are termnatedby the buildi ing-up of a negative charge on the condenser 26 to a value represented by the negative level 46.
  • a period free from oscillation follows the occurrence of each envelope during which the grid voltage becomes gradually less negative by leakage through resistors Ri, R2 until the grid voltage again reaches the critical level lill.
  • the initiation of oscillation is dependent upon random noise voltage fluctuations as indicated at 4i and therefore the normal period To of the oscillation intervals may vary.
  • this frequency of operation is lower than the unmodulated pulse repetition frequency ofl the-carrier wave (see period Ts), the signal pulses of' the carriery wave will operate to initiate the oscillation intervals prior to the grid voltage reaching thecritical level 4B.
  • the pulse modulation of the carrier wave is represented in curve a by the signal pulses 5I, 52 and 53, 5d wherein the signal pulses :are in pairs as indicated andthe maximum degree of modulation is represented by the difierence in the intervals t1 and t2.
  • This double pulse modulation is chosen for purposes ofA illustration, it being understood that other forms of pulse modulation may received where the translation is'made into voltage impulses oi a selected width according. ⁇ to Iadjustment of the multivibrator. shown, the pulse Elfoccurs prior to thegrid voltage reaching the levellliif andthe energyof the pulse. when superimposedA on the grid voltage, (curve b) increases the grid voltage sharplyvabove the level 453i thereby initiating the oscillation-interval incoincidence with the leading edgeof'the.
  • pulses 52V; 53 and 5.4 synchronize the operation ofthe oscillatingtrigger circuit tov pro-.-v
  • the circuit of Fig. 4f comprises the usual antenna iii which is ⁇ applied to anin'- ductance; coil 621 through a ccuplingcondenser Si and-*an adjustable contact 63.; is connected inparallel with an adjustable condenser Sill tunable toftl'i'e R.
  • A" further tuning ofl the carrier wave detecting circuitv 62, ⁇ 64.7is .proe vided by a second'ad-justablecondenser lwhch is connected betweeny oneA side ⁇ of the resonant circuit andv ground.
  • the side 67 ofv the resonant circuity is connected ⁇ to tliey anode iiipiofk arvacuum tubes l
  • The. side 'of the resonant circuit is connected through ablocking condenser 72 tov
  • the cathode 74 is connected-LA a control grid i3. tog'round; An adjustable grid/leak! resistorl 15 Asv It is readily apparent from an inspection,
  • the plate circuit of the tube is supplied with apositivel potential from a battery terminal'l through a resistor 'l1 and an R. F. isolating inductance coil 'I8 to the side 69 of the resonant circuit. Connected to this circuit between the resistor 'I1 and the coil 'I8 is an output connection 19 which is applied to the T. M. demodulator Sii.
  • the negative value of the grid potential during the intervals between input signals is such as to maintain the circuit non-responsive to most noise voltage fluctuations thereby providing a high signal-to-noise ratio for the receiver.
  • the feed-back feature of the embodiments herein disclosed greatly increases desirably the gain of the triggering circuit.
  • a radio receiver for time modulated pulse reception comprising an oscillating trigger circuit having normal interval operation at a lower frequency than the unmodulated pulse repetition frequency of a given time modulated pulse source, means controlled by the oscillations occurring in the oscillating circuit for each operating interval to produce a voltage impulse, means to apply energy received from said pulse source to said circuit to synchronously control the operation thereof, whereby the impulses produced correspond in occurrence to the pulse occurrence of said source, and means for demodulating the impulses.
  • the radio receiver dened in claim 1 wherein the means for producing said impulses includes a multivibrator having a mode of operation initiatable by the occurrence of oscillations in said oscillating circuit.
  • the means for producing said impulses includes a condenser-resistor combination adapted to build-up a blocking voltage in response to oscillations in said circuit and to control the dissipation of the blocking voltage at a given rate selected in accordance with the unmodulated pulse repetition frequency of said pulse source.
  • the means for producing said impulses includes a multivibrator, means to apply the output of said oscillating trigger circuit to said multivibrator whereby the occurrence of oscillations causes the multivibrator to chan-ge from one state of operation to a second state of operation from which the multivibrator returns after a predetermined operation, and means to apply the impulse output of said multivibrator to the oscillating trigger circuit to increase the sensitivity thereof during the oscillating interval thereof.
  • the oscillating trigger circuit includes a vacuum tube having plate, grid and cathode electrodes, said grid and cathode electrodes being connected to the means for applying energy of said pulse source, means connected to the plate electrode for supplying the output impulses in response tov oscillations established in the tube circuit, and means adjustable to control the bias of said tube.
  • a multivibrator controlled by the occurrence of oscillations in said circuit for producing for each interval of operation an impulse of given duration, and means to apply energy of said given source to said circuit to synchronously trigger the operation thereof whereby the impulses produced by said multivibrator correspond in occurrence to the pulse occurrence of said source.
  • a circuit for translating the pulses of a time modulated pulse source into an equivalent train of time modulated impulses comprising an oscillating trigger circuit, means adjustable to establish the normal interval operation of said oscilating trigger circuit at a lower frequency than the pulse repetition frequency of said given source, said circuit having a vacuum tube with plate, grid and cathode electrodes, an inductance-capacitance circuit tunable to receive energy of said given source, said inductance-capacitance circuit being connected across certain of the electrodes of said tube to provide a tube circuit in which initiation of oscillations is caused by the pulse energy of said source, and means controlled by the oscillations occurring in the tube circuit for producing an impulse, whereby the occurrence of pulses in said source operate to generate through the medium of said oscillating trigger circuit a train of impulses which correspond in occurrence to the pulse occurrence of said source.
  • the means for producing the impulses includes a multivibrator having a, mode of operation initiatable by the occurrence of oscillations in said tube circuit, the plate electrode of said tube circuit being connected to the input of said multivibrator, and feed-back means connecting the output of said multivibrator to one of the electrodes of said tube.
  • the tube includes a, screen grid electrode and means to apply a source of voltage to said screen grid to control the normal operating frequency of the oscillating trigger circuit
  • the means for producing the impulses includes a multivibrator havmem-aaai ingfia, moda of operation initiatableby the: occur+ rencei of; oscillations in said: tubetcircuitand 'iced-- build-up a negative: charge during: oscillations in;
  • mea-ns. for. producing said: impulses. includes: a
  • the means forY producing said impulses includes a condenser-resistor combination adapted no-buildupa blockingvoltagein response to oscillationsin said'v circuit and to control the dissipation of" the blocking Voltage at a given rate selected in aocordancewith the pulse repetition-frequency of said ⁇ carrier wave.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Circuits Of Receivers In General (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Electric Clocks (AREA)
  • Near-Field Transmission Systems (AREA)
  • Electrotherapy Devices (AREA)
US488181A 1943-05-24 1943-05-24 Radio receiver Expired - Lifetime US2419569A (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
BE481275D BE481275A (sv) 1943-05-24
NL137189D NL137189C (sv) 1943-05-24
NL137188D NL137188C (sv) 1943-05-24
BE480693D BE480693A (sv) 1943-05-24
FR57767D FR57767E (sv) 1943-05-24
US488183A US2419570A (en) 1943-05-24 1943-05-24 Receiver circuit
US488181A US2419569A (en) 1943-05-24 1943-05-24 Radio receiver
GB20199/44A GB600255A (en) 1943-05-24 1944-10-18 Improvements in or relating to receivers for time modulated pulses of radio waves
GB1233/45A GB600259A (en) 1943-05-24 1945-01-15 Improvements in or relating to receiving circuits for time modulated electric pulses
FR951075D FR951075A (fr) 1943-05-24 1947-08-05 Montages récepteurs d'impulsions radioélectriques
ES0182493A ES182493A1 (es) 1943-05-24 1948-02-20 Mejoras en radorreceptores

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US488181A US2419569A (en) 1943-05-24 1943-05-24 Radio receiver

Publications (1)

Publication Number Publication Date
US2419569A true US2419569A (en) 1947-04-29

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ID=23938645

Family Applications (1)

Application Number Title Priority Date Filing Date
US488181A Expired - Lifetime US2419569A (en) 1943-05-24 1943-05-24 Radio receiver

Country Status (6)

Country Link
US (1) US2419569A (sv)
BE (2) BE480693A (sv)
ES (1) ES182493A1 (sv)
FR (2) FR951075A (sv)
GB (2) GB600255A (sv)
NL (2) NL137188C (sv)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2511409A (en) * 1947-10-22 1950-06-13 Hallicrafters Co Superregenerative circuit
US2515282A (en) * 1945-02-17 1950-07-18 Everard M Williams Portable interference transmitter
US2520136A (en) * 1944-09-15 1950-08-29 Int Standard Electric Corp Superregenerative receiver for electromagnetic waves
US2525634A (en) * 1945-12-07 1950-10-10 Rca Corp Pulse communication system
US2532221A (en) * 1945-01-16 1950-11-28 Philco Corp Pulse modulated echo ranging system
US2552496A (en) * 1942-11-30 1951-05-08 Rinia Herre Receiver for modulated radiofrequency pulses
US2553219A (en) * 1946-04-02 1951-05-15 Philco Corp Superregenerator
US2588730A (en) * 1947-05-02 1952-03-11 Wayne R Johnson Method and apparatus for frequency response measurement
US2623173A (en) * 1947-06-05 1952-12-23 Gen Teleradio Inc Television phase-actuated control equipment
US2656465A (en) * 1948-05-12 1953-10-20 Zenith Radio Corp Synchronizing system
US2704812A (en) * 1949-05-26 1955-03-22 Gen Electric Synchronizing system
US2966953A (en) * 1955-11-14 1961-01-03 Jersey Prod Res Co Apparatus for presenting seismic data
US3195069A (en) * 1960-07-20 1965-07-13 Itt Signal generator having a controllable frequency characteristic

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1919985A (en) * 1931-07-23 1933-07-25 Gen Electric Cathode ray oscillograph sweep circuit
US2266401A (en) * 1937-06-18 1941-12-16 Int Standard Electric Corp Signaling system
US2323596A (en) * 1941-06-17 1943-07-06 Rca Corp Frequency modulation receiver

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1919985A (en) * 1931-07-23 1933-07-25 Gen Electric Cathode ray oscillograph sweep circuit
US2266401A (en) * 1937-06-18 1941-12-16 Int Standard Electric Corp Signaling system
US2323596A (en) * 1941-06-17 1943-07-06 Rca Corp Frequency modulation receiver

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2552496A (en) * 1942-11-30 1951-05-08 Rinia Herre Receiver for modulated radiofrequency pulses
US2520136A (en) * 1944-09-15 1950-08-29 Int Standard Electric Corp Superregenerative receiver for electromagnetic waves
US2532221A (en) * 1945-01-16 1950-11-28 Philco Corp Pulse modulated echo ranging system
US2515282A (en) * 1945-02-17 1950-07-18 Everard M Williams Portable interference transmitter
US2525634A (en) * 1945-12-07 1950-10-10 Rca Corp Pulse communication system
US2553219A (en) * 1946-04-02 1951-05-15 Philco Corp Superregenerator
US2588730A (en) * 1947-05-02 1952-03-11 Wayne R Johnson Method and apparatus for frequency response measurement
US2623173A (en) * 1947-06-05 1952-12-23 Gen Teleradio Inc Television phase-actuated control equipment
US2511409A (en) * 1947-10-22 1950-06-13 Hallicrafters Co Superregenerative circuit
US2656465A (en) * 1948-05-12 1953-10-20 Zenith Radio Corp Synchronizing system
US2704812A (en) * 1949-05-26 1955-03-22 Gen Electric Synchronizing system
US2966953A (en) * 1955-11-14 1961-01-03 Jersey Prod Res Co Apparatus for presenting seismic data
US3195069A (en) * 1960-07-20 1965-07-13 Itt Signal generator having a controllable frequency characteristic

Also Published As

Publication number Publication date
GB600255A (en) 1948-04-05
FR951075A (fr) 1949-10-14
NL137189C (sv)
GB600259A (en) 1948-04-05
BE480693A (sv)
BE481275A (sv)
NL137188C (sv)
ES182493A1 (es) 1948-04-16
FR57767E (sv) 1953-09-09

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