US2294182A - Tuning indicator for carriersignal receivers - Google Patents

Tuning indicator for carriersignal receivers Download PDF

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Publication number
US2294182A
US2294182A US326149A US32614940A US2294182A US 2294182 A US2294182 A US 2294182A US 326149 A US326149 A US 326149A US 32614940 A US32614940 A US 32614940A US 2294182 A US2294182 A US 2294182A
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United States
Prior art keywords
receiver
cathode
tuning
signal
frequency
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
US326149A
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English (en)
Inventor
Robert T Hintz
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.)
BAE Systems Aerospace Inc
Original Assignee
Hazeltine Corp
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Filing date
Publication date
Priority to BE441000D priority Critical patent/BE441000A/fr
Application filed by Hazeltine Corp filed Critical Hazeltine Corp
Priority to US326149A priority patent/US2294182A/en
Priority to FR871036D priority patent/FR871036A/fr
Application granted granted Critical
Publication of US2294182A publication Critical patent/US2294182A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/12—Electrically-operated arrangements for indicating correct tuning
    • H03J3/14—Visual indication, e.g. magic eye

Definitions

  • the present invention relates to improved tuning indicators for carrier-signal receivers and, particularly, to tuning indicators of the cathode-ray tube type especially suitable for use in tunable frequency-modulated carrier-signal receivers.
  • Carrier-signal receivers conventionally -are provided with an adjustable tuning means for tuning the receiver toa desired carrier signal which may comprise either conventional adjustable tuning elements or preselector tuning elements which may be selectively connected into the receiver circuit and a vernier tuning element to procure more precise tuning.
  • an adjustable tuning means for tuning the receiver toa desired carrier signal which may comprise either conventional adjustable tuning elements or preselector tuning elements which may be selectively connected into the receiver circuit and a vernier tuning element to procure more precise tuning.
  • the tuning indicators of the prior art have been devised in large part for amplitude-modulation carrier-signal receivers and generallyv have consisted of some device for indicating theimagnitude of a unidirectional current or voltage derivedfrom, and varying with, the signal-carrier which, in turn, varies in accordance with the accuracy of tuning of the receiver to a signalcarrier wave of constant frequency. 'Ihe strength of the amplitude-modulated signals translated by the receiver, in general, is greatest when the receiver is accurately tuned to the de- Asired signal-carrier wave and the indication of over a broad frequency band.
  • tion is derived from the signal energy appearing in the signal channel of the receiver at some Point ahead of the limiter devices. While it is possible to provide a special signal-translating channel through which signal energy can be supplied to a tuning indicator or the prior art type, such special channel necessarily has relatively sharply-tuned circuits and it is dimcult to maintain these circuits properly ahgnecl with the tuned circuits oi' the receiver at the high carrier frequencies commonly used for frequency-modulation transmissions.
  • a tuning indicator for a carrier-signal receiver including an adjustable tuning means comprises a cathode-ray tube, an input circuit adapted to have applied thereto a unidirectional control potential, the magnitude and polarity of Whichvary in accordance with the degree and direction, respectively, of mistuning of the receiver on either side of the received signal.
  • the tuning indicator also includes means for deriving from the unidirectional potential two unidirectional controlsignals varying in accordance therewith in opposite senses, and means responsive to the control signals for deflecting the ⁇ cathode ray of the tube to produce on the' screen of the cathode-ray tube two luminous areas, the positions of which on the screen' 2 visually indicate the degree and direction ci the mistimins.
  • Fig. l is a circuit diagram, partly schematic,7 or a complete carrier-signal receiver embodying the invention
  • Fig. 2 illustrates the deflection patterns produced under various tuning conditions oi the receiver upon the screen of the cathode-ray tuning indicator tube employed in the Fig. l embodi ment
  • Fig. 3 is a circuit diagram of a modified form of the tuning indicator circuit of the invention
  • Fig. 4 illustrates schematically a .modined cathode-ray tube construction which may be employed with any of' the forms, of tb" invention shown in the several ngures.
  • the receiver includes a tunable radio-frequency amplier lI having its input circuit connected to an antenna system II, I2, and having its output circuit com nected to a tunablefrequency changer or oscil lator-modulator I3.
  • a tunable radio-frequency amplier lI having its input circuit connected to an antenna system II, I2, and having its output circuit com nected to a tunablefrequency changer or oscil lator-modulator I3.
  • an intermediate-frequency amplifier of one or more stages Connected in cascade with the oscillator-modulator I3, in the order named, are an intermediate-frequency amplifier of one or more stages.
  • anamplitude limiter I5 a frequency detector and tuning indicator system IS, more fully described hereinafter, an audio-frequency ampliner I1 of one or more stages, and a sound reproducer I8.
  • the tuning indicator of the invention comprises a cathode-ray tube 32 of the type having a pair of defiecting electrodes 33 and 34, each adapted and arranged to deflect in diierent di- .36.
  • y anode has a truste-conical shape and the cathode is an elongated cylinder coaxially positioned with rections a beam of electrons emitted by a cathode 35 and attracted to a fluorescent screen or anode the respect to the anode.
  • the defiecting electrodes are generally rods of i a diameter appreciably smaller than that of electrodes being positioned .with their axes parellel to each other and to the axis of thecathode ybut spaced. from the cathode on opposite sides thereof.
  • the circuit of deiiecting electrode I3 is connested through a pair of tandem-connected direct current ampliners 31 and 4l and through an audio-frequency filter, comprising a shunt condenser 43 and a series resistor 41, to the highpotential terminal of the resistors 22 and 23 in series.
  • the deflection electrode 34 is similarly connected through a single direct current amplifier l and through the audio-frequency lter Atti, it to the high-,potential terminal of the resistors 22 and 23 in series. Operating current tor the amplifiers and 4I is supplied through load. resistors 38 and 42, respectively, from a ,source of operating potential +B as indicated.
  • the frequencyresponsive network I9 and frequency detector are, in general, similar to conventional frequency-discriminating networks utilized in automatic frequency control systems of the prior art and utilize the principle of rectifying separately the sum and diderence of the voltages across the primary and secondary of a double-tunedcircuit and combining differentially the rectified voltages so obtained to provide a unidirectional voltage the magnitude intermediate-frequency carrier signal in the esfcillator-modulator I3, amplified in the interina diate-frequenoy ampliiier I4, limited to a pre determined substantially constant ampiitude by the limiter I5, and detected by the frequency detector I6, thereby to derive the audio-fretniency modulation components.
  • the audio-frequency' components are, in turn, amplified in the audiofrequency amplifier i1 and are reproduced by the Y sound reproducer circuit including a condenser 24 and an inductor 23 inductively coupled to an inductor 25 of a secondary circuit tuned
  • intermediate-frequency carrier signal has a mean carrier frequency equal to the mean resonant frequency of the intermediate-frequency selectors oi the receiver.
  • the unidirectional potentials produced across the resistors 22, 23 are oi equal magnitude but of opposite polarity.
  • the audio-frequency filter 43, #il removes the audio-frequency modulation components from this unidirectional potential and there is, therefore, nopotential supplied through the audio-frequency lter 46, 41 to the amplifiers 31, 4I. ⁇
  • the normal operatingv currents oi these amplifiers cause a normal potential drop to appear across the load resistors 33 and 42, respectively, thereby biasing. the deilecting electrodes 33 and 34 to their normal operating potentials.
  • Each of the de- Y the equal luminous areas are represented by the light portions C and D.
  • the frquency-responsive network I9 now operates to I supply a larger potential to one of the diodes 2U, 2l than to the appears across the resistors 22, 23.
  • the deilecting electrodes 33 and 34 constitute a pair of deecting 32, which pairpattern is symmetrical or cordance with the equality or inequality, tively, of the two unidirectional control to the defiecting electrodes 33 respecsi resistor 41.
  • the magnitude and polarity of which vary in accordance with the degree and ⁇ direc-v electrodes 33, 34l are thus included for applying to the detiecting means 33 and u the control signals for delecting the cathode ray oi the tube to produce a deflection pattern,- the symmetry-of which visually indicates the condition of tuning of nal.
  • the deiiection pattern produced on the screen of the cathode-rayl tube includes two lumithe relative areas and the nous areas in which indicate the degree and mean positions visually direction of mistuning.
  • FIG. 3 A modied form of the invention is'shown in Fig. 3, wherein elements corresponding to like elements of Fig. 1- are indicated by like reference characters.
  • a single pentode vacuum tube 48 is employed to provide and phase inversion of the unsymmetrical inacv 23, this inputl circuit is the receiver to the received sigofthe tube 48, comprising a suppressor electrode means for deriving from said unidirectional po- 49 and a cathode 5t, are connected through the tential two unidirectional control signals varying audio-frequency filter 45, si across the resistors n in accordance therewith in opposite senses, and 22, 23;
  • the anode 5i and the screen lic both means responsive to said control signals for deserve as output electrodes, each being connected 5 fleeting the cathode ray of said tube to produce to one o the delecting ,electrodes 33 and 3s of Lon the screen of said cathode-ray tube two lumithe cathode-ray tube 32.
  • the output electrodes are not areas, the relativemean positions of which 5
  • the resistors 53 and 54 10 2.
  • a tuning indicatorfor a carrier-signal rehave values such that equal potentials are supceiver including an adjustable tuning means plied to the deflecting electrodes 33, when the comprising, a cathode-ray tube, an input circuit receiver isnot receiving any carrier signal and adapted to have applied thereto a unidirectional the characteristicsof tube A8 are such that concontrol potential, the relative magnitude and trol signals of equal and opposite values are depolarity of which vary in accordance with the veloped across resistors 53 and 54 in response to degree and direction, respectively or mistuning a control potential appliedV toits suppressor of said receiver on either side oi said received grid.
  • Such'amplifying and phase-reversing cirsignal, means for deriving from said unidireccuit is disclosed and claimed in United States tional potential two unidirectional control sig- Letters Patent No. 1,997,665, granted April 16, ynals varying in accordance therewith in opposite 1935, upon the application of Harold A. Wheeler. senses. and means responsive to said control sig-
  • the operation ofthe arrangement of Fig. 3 is nais for deecting the cathode yray of said tube identical to that of Fig.
  • a tuning indicator lor a carrier-signal reusually positioned 180 degrees apart on oppositek
  • the deflecting electrodes 3c adapted to have applied thereto a imidire'ctional may be spaced a lesser angle than 180 degrees, ycontrol potential, the relative magnitude and as illustrated in Fig. 4.
  • the signals 'for deflecting the cathode ray ⁇ or said position of the line M for exact tuning oi the re- 40 tube to produce on the screen of said cathode-ray DC to a received carrier signal may be indi tube two luminous areas, the relative areas and cated by a fixed indicator 51. Detuning the remean positions of which visually indicate the deceiver on one side of thepreceived signal has the gree and direction of said mistuning.
  • a tuning indicator for a, carrier-signal reone side of the indicator 51 to a degree depend- 45'ceiver including an adjustable tuning means ing upon the degree of mistunng o the receiver. comprising, a cathode-ray tube, an input circuit Similarly, mistuning the receiver to the opposite adapted to have applied thereto a unidirectional side of the received signal shifts the luminous potential, the magnitude and polarity o1.' which line M", Fig.
  • the lower halt oi the cathunidirectional potential two unidirectional conode-ray tube screen may be mashed or denuded trol signals the relative magnitudes of whicl of fluorescent material to eliminate the luminous vary in accordance with the degree and direcareas N, N', and N", thereby leaving only the 5 tion of said mistuning, and means responsive t4 movement of the luminous line M to provide the said control signals for defiecting the cathod ⁇ visual tuning indication.
  • tuning indicator for a carrier-signal r4 cations may be made therein without departing
  • Cithode-ray tube input circu the appended claims to cover all such changes adapted to have applied thereto a unidirection and modifications as fall within the true spirit potential, the magnitude and polarity of 'whia and scope of the invention. vary in accordance with the degree and dire What is claimed is: tion, respectively, of the mistuning of said r l.
  • a tuning indicator for a carrier-signal receiver on either side of said received sign DC including an adjustable tuning mans means for deriving from ⁇ said unidirectional t Comprising, a cathode-ray tube, an input circuit ,m teni-,iai two unidirectional control signals the r adapted to have applied thereto a unidirectional ative magnitudes of which vary in accorda! control potential, the magnitude and polarity with the degree and direction of said mistuni of which vary in accordance with the degree and and means responsive to said control signals direction, respectively, of.
  • a tuning7 indicator for a carrier-signal receiver including an adjustable tuning means comprising, a cathode-ray tube, an input circuit adapted to have applied thereto a unidirectional potential, the magnitude and polarity of which vary in accordance with the degree and direction, respectively, of the mistuning of said receiver on either side of said received signal, means for utilizing said unidirectional potential to produce two unidirectional control signals the relative magnitudes of which vary with the magnitude of said unidirectional potential and the sense of the relative magnitudes of which varies with the polarity of said unidirectional potential, and means responsive to said control signals for deecting the cathode ray of said tube to produce on the screenof said cathode-ray tube two luminous areas which visually indicate the degree and direction oi said mistuning.
  • a tuning indicator for a carrier-signal receiver including an adjustable tuning means comprising, a cathode-ray tube, a pair of deecting means for said cathode-ray tube adapted and arranged to produce a symmetrical or an unsymmetrical deflection pattern according to the relative magnitudes of control signals applied to said deecting means, an input circuit adapted to have applied thereto a unidirectional'potential, the magnitude and polarity of which vary in accordance with the degree and direction, re-
  • a tuning indicator for a carrier-signal receiver including an adjustable tuning means comprising, a cathode-ray tube, a pair of deiiecting means for said cathode-ray tube adapted and arranged to produce a symmetrical or an unsym metrical deection pattern according to the equality or inequalit respectively, of two unidirectional control signals applied to said deflecting means, an input circuit adapted to have applied thereto a unidirectional potential, the magnitude and polarity of which vary in accordance with the degree and direction, respectively, of

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US326149A 1940-03-27 1940-03-27 Tuning indicator for carriersignal receivers Expired - Lifetime US2294182A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE441000D BE441000A (enrdf_load_stackoverflow) 1940-03-27
US326149A US2294182A (en) 1940-03-27 1940-03-27 Tuning indicator for carriersignal receivers
FR871036D FR871036A (fr) 1940-03-27 1941-03-24 Indicateur d'accord

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US326149A US2294182A (en) 1940-03-27 1940-03-27 Tuning indicator for carriersignal receivers

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US2294182A true US2294182A (en) 1942-08-25

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BE (1) BE441000A (enrdf_load_stackoverflow)
FR (1) FR871036A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2513786A (en) * 1945-02-14 1950-07-04 Rca Corp Receiver system
DE950946C (de) * 1940-07-23 1956-10-18 Lorenz C Ag Spannungsvergleichsanzeigeroehre

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE975723C (de) * 1951-12-06 1962-06-28 Telefunken Patent Schaltung zur Abstimmungsanzeige
DE1103995B (de) * 1959-09-23 1961-04-06 Philips Patentverwaltung Schaltungsanordnung zur Abstimmanzeige

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE950946C (de) * 1940-07-23 1956-10-18 Lorenz C Ag Spannungsvergleichsanzeigeroehre
US2513786A (en) * 1945-02-14 1950-07-04 Rca Corp Receiver system

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Publication number Publication date
FR871036A (fr) 1942-04-03
BE441000A (enrdf_load_stackoverflow)

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