US2189282A - Receiver tuning control - Google Patents

Receiver tuning control Download PDF

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Publication number
US2189282A
US2189282A US55749A US5574935A US2189282A US 2189282 A US2189282 A US 2189282A US 55749 A US55749 A US 55749A US 5574935 A US5574935 A US 5574935A US 2189282 A US2189282 A US 2189282A
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United States
Prior art keywords
tuning
disc
selector
station
receiver
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Expired - Lifetime
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US55749A
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English (en)
Inventor
Dudley E Foster
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RCA Corp
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RCA Corp
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Publication date
Priority to NL51884D priority Critical patent/NL51884C/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US55749A priority patent/US2189282A/en
Priority claimed from US57354A external-priority patent/US2217293A/en
Priority to FR813746D priority patent/FR813746A/fr
Priority to GB35294/36A priority patent/GB487687A/en
Priority to DER98153D priority patent/DE658977C/de
Priority to GB214/37A priority patent/GB488266A/en
Application granted granted Critical
Publication of US2189282A publication Critical patent/US2189282A/en
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/02—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings
    • H03J5/04—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings operated by hand
    • H03J5/08—Settings determined by a number of separately-actuated positioning means
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
    • H03J1/06—Driving or adjusting arrangements; combined with other driving or adjusting arrangements, e.g. of gain control
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/023—Neutralization of the automatic frequency correction during a tuning change

Definitions

  • AFC Automatic frequency control
  • the invention is ⁇ to ⁇ provide an 'instantaneous selector device in mechanicalassociation with the tuning condenserY mechanism, and wherein the selector may )be adjusted to y positions corresponding to.' predetermined station settings ofthe tuning condenser;
  • the AFC'mustfbe ren-j ⁇ deredinoperative during the portion of the tuning operation just priorto the tuning condenser setting atQWhichl the desiredfsignal would be ob-v l, ⁇ rtained 'with' the AFC in inoperative condition-e30
  • the AFC is again .rendered operative and i completes 4the tuning operation.
  • Such a corref" lation ofAFC operation'and ⁇ tuning adjustmenta not' only ⁇ results in aycomplete simplication of the tuning operation, and accuracy of station selec'ting, but further gives rise to quie tuning.
  • Still another object offrny present invention is o to provide a simplified and accurate station se-$55.
  • the lector device for a radio receiver of the superheterodyne type, and which receiver is equipped with AFC of the local oscillator;
  • the station selector generically comprising a rotatable dial provided with a series of spaced openings; the openings corresponding to different desired -stations; and a shiftable-stop element being positioned in such relation with respect to the selector dial that the receiver tuning device has its motion of adjustment arrested at the same location regardless of Whether the rotation of the dial is clockwise or counter-clockwise.
  • Another object of this invention isV to provide a radio receiver of the superheterodyne type with an AFC network, as well as a station selector dial for simply and accurately adjusting the tuning condensers of the receiver; the dial being provided with adjustable spaced station buttons provided with elements adapted to mechanically co operate with a dial rotation stop member in order to limit the rotation of the Vdial in accordance ⁇ with selected station buttons; and the selector dial being further associated with a control mem- ;ber for the AFC network with the result that the AFC isoperative at all times except when a selected button is adjusted into mechanical cov'operation with the stop mechanism.
  • Fig. 2 is a front view ⁇ of the station selector :mechanism, of the type shown in Fig. Las* viewed from the front of the radio receiver operating lpanel, v
  • Fig. 3 is a partial sectional view of the-'station selector mechanism, taken along line 3 3 of Fig.
  • Fig. i8 is an 4end view'ofthe selector modification in Fig. 6,
  • Fig. '9 isafront viewof still another modified formvof selector mechanism
  • Fig. 10 is an end view,A partly in section, of the selector'modication of Fig. 9,v
  • V vanother modification, Vviewed from V-Vthe receiver panel, of they type of selector Vrnechyanism yshown in Fig. ⁇ 9, Y
  • FIG. 1 is a conventional representation of the system shown in detail in Fig. 4 of application Serial No. 45,413, filed October 17, 1935 by S. W. Seeley, patented June 21, 1938 as U. S. P. 2,121,103.
  • the usual signal carrier energy collector A such as a grounded antenna; a radio frequency distribution line; or the conventional collector used on an automobile radio receiver; is coupled to the tunable input lcircuit of :Le receiver.
  • the tunable input circuit usual ⁇ y comprises a variable tuning condenser I, and it is to be clearly understood that the first stage of the receiver may be a radio frequency amplier.
  • ⁇ the numeral 2 designates the rst detector.v e
  • the output circuit 3A of the iirst detector is resona-ted to the operating intermediate frequ'ency. which may have a value, for example. ofy 'to465 k. c. (kilocycles). .
  • plifier has its inputcircuit 5 resonated to they operating I. F. and coupled to the first detector output circuit 3.
  • the I. F. amplifier It is followed by ai double diode tube, as in the 6H6 type tube.
  • This type of tube is provided with independenty diode electrodes, and the common resonant input circuit l' has one side thereof 'connected to the diode anode 8. while the opposite side of the circuit is connected to the diode anode 9.
  • the condenser i4 is connected between cath @des 8 and 9', and the cathode 9 is grounded.
  • the input circuit I is tuned to the operating I. F is reactively coupled to ythe circuit E. as designated by the reference letter M.
  • the audio component of detected I. F. energy is impressed upon one or more audio amplifier stages, followed by a reproducer. through lead I5 and condenser I6. the latter being connected to the junction of resistors l2 and i3.
  • the automatic volume control (AVC) connection i? is employed to apply the direct current voltage component of rectified yI. F. energy to the signal grids of controlled tubes and 1i.
  • the AVC connection il is made tothe junction of resistors l2 and i3, and of course, the
  • directcurrent voltage component is transmitted through appropriate lter resistors before being' applied to the gain control grids of the controlled tubes.
  • the AFC network involves the tunable tank circuit I8 of the local oscillator I9.
  • the variable lcondenser 2Il in the tank circuit ⁇ I8 has ⁇ its rotors mechanically uni-con trolled with therotors of the variable tuning condensersj of the tunable signal circuits feeding the rst detector. ⁇ The'dottedline 2I represents such mechanical uni-control..
  • the oscillator I9 is tuned, at any ⁇ setting ofthe tun-l is varied' through the operating frequency range,
  • the locallyproducedoscillations are impressed ⁇ on the first detector 2 in any desired manner, as
  • the AFC connection 26 is madev from the control" grid of tube 22, through an appropriate filter resistor, tothe cathode sideofresistor I2. .
  • the mutual conductance of tube 22 isvaried inde ⁇ pendence upon the magnitude of the direct current component of the differential rectified I. F. energy.
  • the magnitude and polarity of the po tential at the cathodeside of resistor I2 vdeter ⁇ lresonant frequency is applied, are added vecl torially, the absolute magnitude of the resultant ondary circuits I5 ⁇ and] are so related that two vector sum. potentials of thev primary and sec- 5 'ondary voltages may be realized.
  • the magnitude and the polarity ofthe potential at point 4I determines the magnitude of the effective inductance reected across tank circuit I8.
  • the ⁇ AFC voltage applied to the grid of ⁇ tube 22 is positive (thereby overcoming some of the ⁇ initial bias appliedin the cathode circuit of that tube)
  • its mutual conductance is increased.
  • the amount of leading current flowing in connection 25 is thereby increased; which is the same'asl through the lagging current flowing throughthe variable tuning condenser 20 has been decreased.
  • This acts asthough that condenser had been decreased .in value ⁇ thereby ⁇ causing" the tuned frequency of tank circuit I8 to increaseA
  • ⁇ a signal impressed on primary circuit is approaching the I. F.
  • a practical difculty encountered in employ- Aing AFC' in ⁇ a superheterodyne receiver is -the kproblem of dislodging a strong signal to make i way for a weaker one on a closely adjacent channel, without having the weaker station jump right across the "band toV disappear onthe other side.
  • a switch 3D may be employed.
  • 'I'he switch S0 functions to ground the bias voltage derived frompoint 40, and rendersthe AFC network inoperative at the will of the opierator.r This offers a means for correlating the 4operation of the AFC network with the tuning 50 operation so as to render the tuning of the receivingl system not' only accurate, 'but highly simplified.
  • schematiiliary switch 3l which comprises a relatively fixed contact element 32. and a relatively movable contact element ⁇ 33.
  • the contact 32 is connected by lead 34to the AFC line 26, whereas the ⁇ con- ⁇ 30 may be mounted in the rear of the receiver ⁇ chassis, whereas thesupplementary switch kEll maybe mechanically associated with the selector dial as shown'in Fig. 3.
  • the station selector mechanism that is em-f5 l ployed is of the dial type. It generally, comprises a rotatable disc 4H which is provided with a plurality of station selector elements, or ears, 4I.r Each of thesey elements 4I is provided atits outer en@ with sdepressibie button ⁇ 4in/and ati-f7.0 its inner end with 'a threaded screw member 43.
  • the function of members 43 is to adjust each of the selector elementslll ⁇ inany desired radial' position ⁇ alongfthe periphery of the dial disc 40.
  • switch closure member 46 is provided with a widened edge
  • the pin 45 when shifted into through any desired mechanical coupling arrangement.
  • 'Ihis reduction gearing comprises a small vdrive gear '46 which is rotated in unison with vdisc 4D; the driven gear 41 meshing with gear 46,'and in turn having a rigid connection to the tuning velement 2l.
  • the -manually adjustable tuning device of the receivfing system comprises Aa rotatable station selector vvdisc Vprovided with a plurality of independent station selecting buttons 42.
  • the tuning process .involves the insertion of the users finger in the borehousing a button 42, assuming the button has been depressed, and the rotation of the dial The rotation ceases when the particular pin 45 moves into contact with the pivotable closure member y4t, and the latter moves into contact with one .of-the stop pins 4l. This results in the rendering of inoperative at that point, as well .as Aa positive arresting of the rotation of dial 40. The button 42 is releasedthereby withdrawing pin 45, and opening switch 3l.
  • FIG. 2 there is shown the appearance of the station selector mechanism when viewed from the front of the operating .panel of a radio receiver.
  • the disc 40 is provided, concentrically therewith, with an annular Adial bearing scale indicia l which denote the variousfrequencies to be received.
  • this circular dial 50 will bear-a plurality of scale ranges to correspond tothe different frequency bands of the receiver.
  • the scale 5 is rigidly secured to theouter face of disc 4l) in any desired manner; rotation of the disc k4l) therefore also resulting 'in rotation of the dial 50.
  • buttons carrier members 4I Each of the button carrier members 4I is bifurcated at the point of contact with the periph- -ery of disc 40. .As shown in Fig. 3 in greater switch 3l.
  • each ofthe members 4I is rigidlysecured to a predetermined position on the periphery of disc by means of the threaded coupling between screw 43 and the threaded bore provided in one of the legs 5l of the bifurcated portion of each of members 4l.
  • Each of screws 43 is provided with a ball tip 52, the tip being shaped to complement the shape ofthe groove 44. 'I'hat is to say, the cross section of groove 44 will be substantially semi-circular so as to receive snugly the semi-circular contour of the ball tip 52.
  • a member 4I can be substantially rigidly secured to the periphery of disc 4H by the use of a screw driver, which is employed to rotate the desired screw 43.
  • the buttons 42 are disposed within bores provided at the free ends of each carrier member 4 I.
  • a button 42 comprises a shank Si! which is adapted to reciprocate through a narrow bore provided at the rear face of the member 4
  • This rear bore widens into a second bore adapted to receive a spring 6
  • the head 32 of each button is arranged to reciprocate within a third and ⁇ wider bore 63.
  • the head 62 may comprise, as shown in Fig. 3, a comparatively narrow recessed casing within which is disposed a circular station designation plate 64y having its upper face in contact with a transparent protective circular plate 65.
  • the head of each button will, therefore, have exposed to the View of the set user the various station call letters.
  • Those shown in Fig. 2 represent' the various station call letters of broadcast stations encountered in the New York City area.
  • each button device 42 is providedy with a normally protruding pin 1D.
  • 'Ihe portion Aof the pin "lll between shank 50 and the rear tip of the pin is in threaded engagement with a nut il.
  • the latter nut functions as a stop nut, and its face, in contact with the rear face of ear 4l, limits the movement of pin 'l0 in the direction of Vthe operating panel.
  • the AFC switch 3l asr shown in detail in Figs. 4 and 5, comprises the contact elements 32 and 33.
  • the contact element 33 has spaced therefrom a presser strip 13, one end of which is also gripped between insulation spacers.
  • the bolts i4 function to rigidly secure together the various ⁇ insulation spacers, and maintain the ends of strips 32, 33 and 13 in spaced relation.
  • the nxed ends of Contact elements s2 and 33 project beyond'the spacers T2, and numerals 'l5 and i6 designate these projecting ends which act as connecting terminals to the lead 34 and ground.
  • the free end of element 32 is provided with a button Tl, and the free end ofcontact element 33 is provided with a contact pin 78.
  • v y member 46 isvrigidlysecured toa support plate ⁇ 82, the latter being' spaced from the operating upper edge, the bolt 8l.
  • the frontpanel 83 of the receiver is provided vwith a metallicring 84.
  • the disc 48 is disposed concentrically with respect to the ring 84, and as seen in Fig. 2, ⁇ the ring 84 ⁇ servesas anouter setting for the disc and button carrier assembly. Itwill ⁇ be observed that there is a substantial peripheral space between the periphery of the circle of revolution of the button carriers, and the inner circular edgeof ring 84.
  • the spaced plate 82 has secured to it, at a short distance from its 'Ihe stops 41 and 41' are 'secured to the front face of plate 82, the stops being spaced from each other in the manner shown in Fig. 4.
  • the depending portion 46of member 46 has its rear face in contact with the front face of plate 82, so that when member 46 is shifted between the stops 41 and 41', its rear face is in sliding contact with the front face of
  • the plate 82 ' is rigidly secured to the chassis of the receiver inany desired manner, and through the center thereof there is provided an aperture which acts as abearing for the shaft 85, which is integral with the 'rotor condenser shaft 86. ⁇
  • the ⁇ gear 81 is secured ⁇ to the end of shaft 85 in any ⁇ conventional manner, and gear 81 meshes with driving gear 8,8.”
  • the gear 88 is pinned to the in tegral hub 88 of disc 46.
  • the hub 88 ⁇ is provided with a tubular extension 80, the latter extending to the rear of hub 89, and through a second aperture in plate 82.
  • the extension and hub 89 is provided with af bore in which is disposed the,
  • the index arm 92 is formed from a single element, the vertical eX- posed index arm 92 :being maintained in the same fixed position by virtue of a downwardly directed Normally the upper edge i condenser element of the radio receiver.
  • tuning knob 94 may be pro- ⁇ vided inthe lowermost ⁇ portion of circular ring 84,
  • the manually rotatable shaft 95 can be mechanically coupled to condenser shaft 86 in any conventional. fashion; a belt and pulley arrangement 86 being shown by vway of example. It is to be clearly understood,.however, that the tuning knob 94 and its associated mechanical coupling to condenser shaft 86, may be entirely omitted; since it is only'necessary to use the ⁇ station selector dial 40; f i
  • the numeral 91 designates the variable tuning .not believed necessaryto ⁇ describe the construction of this element since those skilled in the art are fully awareof such construction. It is only believed necessary to point out that the numeral 21 ⁇ denotes the conventional gang of variable con ⁇ densers corresponding tothe variable tuning con# densers 28 and I ofFig. 1. It is also pointed out that gears 81 and'88 ofiFig. 3 correspond respectively to gears 41 fand 46 ofFig. l. l It will now ⁇ be .seen that as abutton 42 is depressed, and the dial assembly 48'is ⁇ rotated, the condenservshaft 86 will be rotated by virtuev of the gearing 88--81.
  • ⁇ the rotor" shaft 86 can be adjusted in clockwise or counterrclockwise sense. As iswell known,4 this adjust- ⁇ ment between the ⁇ limitingpositions is ⁇ only it is desired to initially calibratethe selector mechanism, orwhether ⁇ it is desired to re-calibrate 4the selector mechanism when areceiver is moved from one broadcast area into a relatively distant area, ⁇ it is only necessary to rotate the Acondenser shaft 86 by moving the dial 40 ⁇ until a station is heard ywithout appreciable distortion.
  • the calibration may be accomplished by. employing the tuning knob 94, Where one is provided on the receiver. If the receiver is of the multi-range type, and the station selector dial l4I) .is used for the broadcast band exclusively, then it will be desirable to provide the tuning knob S4 for operation in the shorter wave bands. As stated before, the entire 360 of the selector dial 40 is utilized by Virtue ofthe reduction. gearing 88-81; this permits a wider distribution of members 4l on the selector dial.
  • the two members 3l and 46 definitely ⁇ assure reception of a desired station by causing the. AFC to be .rendered inoperative. This is accomplished during the portion of thev tuning operation just prior to the tuning condenser settingl at which the desired signal .would be obtained with the AFC in inoperative condition.
  • the variable. condenser rotation is such/that the condenser shaft 86 has adjusted the rotors of con.- denser 91 to tune the oscillator and signal circuits within the channel of the desired station, then the AFC is again rendered operative and completes the tuning operation accurately.
  • this electrical sequence of tuning steps is accomplished in the following manner.
  • the station indicia on each button 42 may be made of Amaterial vwhich glows inthe dark, such materials being well known; thereby facilitating adjustment of the dial in the darkness, as in the case of an automobile radio receiver employed in night driving.
  • the station indicia may be in braille so .that blind persons may ⁇ easilyy use the mechanism.V
  • the switch so, also comming the Arc net..
  • a slidable, or pivotable, door may be used to. cover the selector dial. From Fig. 2 it will. be seen that there is plenty of space between members 4.I on dial 40 to provide for re calibration when the receiver ismoved from one broadcasting area to an area where entirely different stations are broadcasting.
  • the electrical operation of the AFC will be obvious from the aforegoing description.
  • the AFC will immediately function to adjust the oscillatorfrequency so as to produce I. F. energy substantially equal to the operating I. F. Because of. thisfunctioning of the AFC network, an additional .advantage is secured by virtue of the selector dial construction. Since the receiver is equipped with an AVC network it functions to reduce the sensitivity of the signal selector circuits as long as'signal energy is ⁇ applied to the AVC rectifier.
  • the .AFC network is operative at all times in a receiving system embodying the present invention,. it necessarilyfollows that signal energy will be impressed on. the AVC rectifier at all times.
  • vthe AVC connection Il in Fig. 1 is .practically functioning at all times to reduce the sensitivity of the signal stages preceding. the I. F. network. This is particularly true when tuning from one station position of the selector dial 4! to another position.
  • inter-station adjustment ci. the receiver results in much noise; the present receiving system and its station selector mechanism produces quiet tuning between channels.. Further, it will be seen that this is accomplished without the use of any auxiliary, and well known types of, noise suppressor networks.
  • the AFC network not only :functions to render the tuning operation simple and accurate; but it also cooperates with the AVC network to provide quiet interchannel operation.
  • FIG. 6 A modiiication of the selector mechanism is illustrated in Fig. 6.
  • This latter figure shows the appearance of the selector mechanism as viewed from the operating panel. It will be seen that it comprises a disc Ill provided on its outer face with a plurality ci spaced tubular devices I FHI
  • the outer face of disc HBO is also provided with a concentric scale disc 102, a stationary scale arm IIlS depending from the rear of the operating panel IM, and cooperating with the indicia IUS provided on the disc 162.
  • Fie'. 7 there is shown in detail the manner of constructing one of the tubular finger positioning devices IUI. It willbeobserved that each of the devices IUI comprises a cylindrical casing HIB having a base i which grips the peripheral edge of disc
  • 56 is provided with a rounded periphery at the exposed opening Ii, and a false bot- ⁇ torn discI I Iis provided at an intermediate point along the length of casing 06.
  • the disc III pears on its outer face station indicia,and the latter areclearly shown in Fig. 6.
  • 00 is directly coupled to the condensershaft H2.
  • the numeral H3 designates, in Fig. 8, the gang of-v condensers, and itv will be observed that the rotor shaft H2 is directly coupled to the disc
  • the finger ⁇ positioning devices II can only be arranged along 180 of the exposed face of disc
  • the circuit closing end of contactor H4 is resiliently secured to a bracket Hi8 which depends from the lug H5. ⁇ This is. accomplished by securing spring H9 between the'free end of bracketIlS and the contacting end of the con- 40y tactor H4.
  • The' spring-retained end oi. contactor H4 is provided with opposed'contact points
  • .lattertwo contacts are connected in common, and are provided with a single connection to the AFC network.
  • the ground connection is provdedl'to thefcontactor H4, and a pair of stops
  • 'Ihe upper end ofthe contacter I4 is providedwith a configuration as shown in Fig. ⁇ 6, and it will be observed that this conguration generally comprises a pair of opposed t concave arcs.
  • the lpurpose of this conguration is to adapt the upper opposed edges of the free endof contactor IUI-to the-contourof a'inger ypositioned ina device IOI.
  • the selector mechanism is shown in still' further simplified form in Figs. 9 and 10.
  • the selector mechanism comprises a disc having a bore
  • 33 is pro vided in the body of disc
  • 35 is provided with a plurality of spaced openings
  • the station selectordevices are ⁇ limited to an 180 distribution .along the periph-V ery of the station selector disc.
  • the entire, circumference of the selector rdisc may. be used by providing an additional AFC switch diametrically opposite to that shown ⁇ in Figf. I
  • This form Aof selector mechanism is shown ⁇ in Figs. 11 and 12.
  • the selector disc andnger posi ⁇ tioning devices are similar in construction to the form shown in Figs. 9 and 10. 4Thatis to say, the numeral
  • a supplemental tuning device In combination with the adjustable tuning device of a radio receiver, a supplemental tuning device, a rotatable station selector disc arranged "gto vary said tuning device to different station reception positions, a plurality of independent finger positioning devices mechanically associated with said disc, and means, relatively fixed 1 70,with respect to said rotatable disc for stopping the rotationnof' said disc upon adjustment of a selected *one of said devices to a xed reference point, said stopping means comprising an element. arranged to rock between a pair of stop u; members andmeansrcooperating with the element at its rocking limits to control said supplemental device.
  • a supplemental tuning device In combination with the adjustable tuning device of a radio receiver, a supplemental tuning device, a rotatable station selector disc arranged IiI to vary said tuning device to different station reception positions, a plurality of independent fin-ger positioning devices mechanically associated with said disc, and means, relatively iixed with respect to said rotatable disc for stopping 10 the rotation of said disc upon adjustment of a selected one of said devices to a fixed reference point, said stopping means including a member arranged to rock between a pair of limiting points, means cooperating with said member at 15.- its rocking limits to control said supplemental device, and means mechanically associated with each of said independent devices for 'rocking said member.
  • a supplemental tuning device In combination with the adjustable tuning f device of a radio receiver, a supplemental tuning device, a rotatable station selector disc arranged to rvary said tuning device to diierent station reception positions, a plurality of independent finger positioning devices mechanically ⁇ asso- I ciated with said disc, and means, relatively fixedV ⁇ with respect to said rotatable disc for stopping the rotation of said disc upon adjustment of a selected one of said devices to a iixed reference point, said stopping means being constructed and 3 0 arranged to shift between a pair of limiting posi- ⁇ tio-ns in accordance with the direction of rotation of said disc andv means cooperating withv said stopping means at its shifting limits to control said supplemental device.
  • a line tuning mechanism a rotatable station selector disc arranged to vary said tuning device to different station reception positions, means controlling the effect 40. of said mechanism, a plurality of -independent finger positioning devices mechanically associated with said disc, and means, relatively iixed with respect to said rotatable disc for stopping the rotation of said disc upon adjustment of a selected one of said devices to a fixed reference point, each of said positioning devices comprising a depressible button carrier member, and each depressible button being provided with a pin adapted to contact said stoppingmeansv to actu- 50, ate said controlling means.
  • a rotatable station selector disc arranged'to vary said tuning device to different station reception positions, a plurality of independent ringer positioning devices mechanically associated with said disc, each of said devices comprising a member provided with a bore, a spring-biased button means in each bore, and means, relatively fixed with respect ⁇ to said 60,' rotatable disc for stopping the rotation of said disc upon adjustment of a selected one of said devices to a fixed reference point, each of said independent devices including means for adjusting a device to any desired position on the disc u for calibration thereof, a pin carried by each of said button means, and each button means being responsive to pressure of a linger for projecting a pin from a positioning device in such a manner that a pin comes in contact with the stopping 70.1 means.
  • each of said positioning devices being provided with a bore to receive the nger of the user, and said stopping means including a shiftable element adapted to be ⁇ adjusted between a pair of limiting positions, said shiftable element being included in a switch device for controlling the operation of said control circuit, andthe path of rotation of said disc being suchthat the said usersnger comes into contact with said shiftable element.
  • a ne tuning device in combination with the adjustable tuning device of a'radio receiver, a ne tuning device, means for controlling the operation of the latter, a rotatable station selector disc arranged to vary said tuning device to different station reception positions, said disc being provided ⁇ with a plurality of independent finger positioning devices,
  • a supplemental tuning device for stopping the rotation of said disc and actuating said controlling means upon adjustment-of a selected one of said devices to a fixed reference point corresponding to the position of said stopping means.
  • a supplemental tuning device for stopping the rotation of said disc and actuating said controlling means upon adjustment-of a selected one of said devices to a fixed reference point corresponding to the position of said stopping means.
  • a supplemental tuning device for varying said tuning device toy different station reception positions, said disc being provided with a plurality of independent finger positioning devices, 4and means, relatively fixed with respect said disc vupon adjustment of a selected one of said devices to a fixed reference point corresponding to the position of said stopping means, each of said finger positioning devices comprising an aperture provided in the disc and ⁇ saidstopping means comprising an adjustable element constructed andarranged to be rocked between a pair of limiting positions and means cooperating with the ⁇ element at its rocking limits to control said supplemental device.
  • a circuit for controlling signal reception a circuit for controlling signal reception, a rotatable station selector disc arranged to vary said tuning device to dierent station reception positions, said disc being provided with ⁇ a plurality of independent finger positioning4 devices, and means, relatively fixed with respect to vsaid rotatable disc Vfor stopping the rotation of said disc upon adjustment of a selected "one of said devices to a fixed I reference point corresponding to the position of said stopping means, said stopping means being included as a control switch insaid controlling circuit, and an additional stopping means arranged adjacent said disc ⁇ at a point diametrically opposite the yposition of the first stopping' ⁇ Vsuperheterodyne type, automatic frequency control means, responsive to received signal energy,
  • switch means for 'ngerpositioning devices for adjusting ⁇ the selector to different desired station settings
  • said switch means being positioned in the path of movement of said devicesin such aimarinerI that the switch is actuated when a device is adjusted to apredetermined' reference pointgand additional means for 1renderingsaid switch inactivev to affect the frequency control upon removal ofthe finger from the ⁇ selected device. -i i 13.
  • automatic frequency control means responsiveA to received signal Veriy c ergy, for adjusting the local oscillator ⁇ frequency to said rotatable disc for stopping the rotation ofv to a magnitude such thatthe frequency of the intermediate frequency energy is made to appreach an ⁇ operating Vfrequency va1ueswitch means for rendering thelfrcquency ⁇ control ⁇ inoperative, an adjustable station selector constructed and arranged to ⁇ vary the position of theadjustable device of the receiver,
  • vautomatic frequency control means responsive to received signalenergy, for adjusting the ⁇ local oscillator frequency to a magnitude such ⁇ that ⁇ the frequency ofthe intermediate frequency ⁇ energy is madeitoapproachfan operating frequency value, switch means for renderingvthe frequency control'inoperative, an'adjustable station selector constructedand arranged tovary the position of.
  • the adjustable tuning device ofthe receiver said selector beingprovided with a plurality of independent fingerpcsitioning devices for adjusting the selectorto different desired station settings, ⁇
  • said switch means being mechanicallycy as-Y sociated with said devices in such a manner that the switch is actuated when a device is adjusted toa predetermined reference point, an adjust-1 able elementadapted *to bevaried in ⁇ position switchmeans at each of said limiting pointajsaid adjustable.
  • the adjustable element being mechanically associated with said independent devices in such a manner that the adjustable element is actuated forrectifying the intermediatefrequency energy and a local oscillator adapted to impress locally produced oscillations upon said rst detector, an adjustable -tuning device electrically associated with said first detector and oscillator,y means, responsive to.r a variation of frequency of said intermediate frequency energy from the operating frequency, for adjusting the oscillator frequency in a sense to cause said intermediate frequency energy to approach said operating frequency, a switch device for controlling the operation of said oscillator frequency control means, means for varying said adjustable tuning device to i predetermined positions, and additional means for actuating said switch device to render the frequency control means inoperative solelyv atsaidpredetermined adjusted positions-of the weine device- A176.
  • a superheterodyne receiver provided With-at least a first detector adapted to produce intermediateA frequency energy of a predetermined operating intermediate frequency, means for rectifying the intermediate frequency energy and-alocaloscillator adapted to impress locally produced oscillations upon said first detector, an adjustable ytuning device electrically associated withsaid first detector and oscillator, means, responsive toa variation of frequency of said intermediate frequency energyfrom the.
  • a switchdevice for controlling the operation vof saidoscillator frequency control means, means for varyingsaid adjustable tuning device topredeterminedpositions, and additional means for actuating said switch device to render the frequency -control means inoperative solely at said predetermined adjusted positions of the tuning, device, signal amplification reduction means, responsive to rectified intermediate frequency energy, forautomatically maintaining the signal amplitude substantially uniformat the said rectifier when thev received signalamplitude increases, and said frequency control means acting to cause said intermediate frequency energy tdbe supplied to said signal-rectifier between said tuning. device-.positions'whereby the tuning operation between said positions is quiet.
  • a radio receiver of the type comprisingy amain tuning device and a supplemental signalactuated tuningmechanism for securing accurate tuning at selected station positions of the main device, means for controlling the operation of the .supplemental mechanism, an adjustable station selector constructed and arranged 'to adjust said main device to'selected positions, said selector. being provided with a plurality of independentstation representation devices for positioning ,an index element, and means constructed and arranged simultaneously to stop the adjustmentxof said selector upon adjustment 'of the positioned ,index element to a fixed reference pointcorrespondingpto the .position of said stop.-
  • a-t'radio, receiver-of the type provided withfaflstation selecting circuit including a main tuningelement, an automatic tuning control arrangement for insuring accurate tuning of the receiver at selected positions of the. ⁇ main element, means for rendering said automatic control ineffective, and additional means, responsive to adjustment of said main tuning element, for actu-l ating saidlast means at said selected positions.
  • 1,9.,Selective adjusting mechanism for tuning radioh-receiversA embodying an automatic frequency control circuit comprising a manually shiftable element drivingly connected with a tunable element of said receiver and selectively operable means for ⁇ stopping the means of the Vshiftable element when the same and'said tunable element reach a desired tuned position, and means operatively associated with said stop means for grounding said automatic frequencycontrol circuit momentarily as said desired tuned posi-tion is reached.
  • Selective adjusting mechanism comprising rotatable means including a portion formed with a series of openings adapted to receive the finger of anoperator-when turning the rotatable means,y stopgrneans for each opening including a button portionA extending in an opening and depressible therein bythe. linger of the' operator, said stopmeans being normally'inactive but being adapted upon depressionr of the corresponding button in its, openingv to stop rotation of the rotatable means-whenthesame reaches an adjusted position determinedfby said stop.
  • Selective.k adjusting mechanism comprising amanually 'shiftable element and selective means operable during and as a part ofthe shifting of saidi'elementr to stop the same when. a desired adjusted position is reached, said selective means comprising-av plurality .of ⁇ selectors individually andE selectively depressible on said manually shiftableelement, each depressible selector comprising Vabutton. member 'andl a stem-like stop elementi aXially.-y movable onthe manually shiftablel element, resilient means arranged in contact with said-'button Vmember and applying pressure L.-
  • a rotatable station selector member arranged to actuate said condenser; to different station reception positions, ai. plurality of selectively operable pushbuttons ⁇ mechanically associated with said selec.- tormember,z means relatively-fixed with respect to said rotatable selector member for stopping the: rotation of said member upon adjustmentof afselectedione of said push-buttons to a xed reference point, a control circuit included in said receiverand ⁇ havinga normally open switch, and Ameanscontrolled by .said push-buttons at their limits of .travel for actuating the switch to lclosed position.; l
  • an adjustable tuning condenser of a radio receiver a rotatable station selector member arranged' to adjust said condenser to different station reception positions, a plurality of selectively operable push-buttons carried by said selector member and capable of sliding movement in a direction normal to the direction of rotation of the selector member, a stop pin carried by each push-button, means co- 10 operating with the stoppin of an operated pushber at a desired tuning position upon actuation of a push-button and the simultaneous rotation of the selector member, a control circuit included in said receiver and having a normally open switch, and means controlled by said stop pin at its limit of travel to actuate the switch to closed position.

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Structure Of Receivers (AREA)
US55749A 1935-12-23 1935-12-23 Receiver tuning control Expired - Lifetime US2189282A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NL51884D NL51884C (enrdf_load_stackoverflow) 1935-12-23
US55749A US2189282A (en) 1935-12-23 1935-12-23 Receiver tuning control
FR813746D FR813746A (fr) 1935-12-23 1936-11-19 Perfectionnements aux dispositifs d'accord pour radio-récepteurs
GB35294/36A GB487687A (en) 1935-12-23 1936-12-23 Improvements in or relating to tuning controls for radio receivers
DER98153D DE658977C (de) 1935-12-23 1936-12-24 Empfaenger mit selbsttaetiger Scharfabstimmung und einer Schaltvorrichtung zur Ausserbetriebsetzung der selbsttaetigen Scharfabstimmung
GB214/37A GB488266A (en) 1935-12-23 1937-01-04 Improvements in or relating to tuning controls for radio receivers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US55749A US2189282A (en) 1935-12-23 1935-12-23 Receiver tuning control
US57354A US2217293A (en) 1936-01-03 1936-01-03 Receiver tuning control

Publications (1)

Publication Number Publication Date
US2189282A true US2189282A (en) 1940-02-06

Family

ID=26734587

Family Applications (1)

Application Number Title Priority Date Filing Date
US55749A Expired - Lifetime US2189282A (en) 1935-12-23 1935-12-23 Receiver tuning control

Country Status (5)

Country Link
US (1) US2189282A (enrdf_load_stackoverflow)
DE (1) DE658977C (enrdf_load_stackoverflow)
FR (1) FR813746A (enrdf_load_stackoverflow)
GB (2) GB487687A (enrdf_load_stackoverflow)
NL (1) NL51884C (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422082A (en) * 1943-03-03 1947-06-10 Rca Corp Reactance control circuit
US2487772A (en) * 1945-08-08 1949-11-08 Colonial Radio Corp Signal-seeking receiver for amplitude modulation and frequency modulation signals
US2498954A (en) * 1946-05-07 1950-02-28 Panoramic Radio Corp Panoramic receiver with means for modifying signal pulses applied to indicators
US2666847A (en) * 1949-06-25 1954-01-19 Philco Corp Automatic frequency control for carrier-wave receivers

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422082A (en) * 1943-03-03 1947-06-10 Rca Corp Reactance control circuit
US2487772A (en) * 1945-08-08 1949-11-08 Colonial Radio Corp Signal-seeking receiver for amplitude modulation and frequency modulation signals
US2498954A (en) * 1946-05-07 1950-02-28 Panoramic Radio Corp Panoramic receiver with means for modifying signal pulses applied to indicators
US2666847A (en) * 1949-06-25 1954-01-19 Philco Corp Automatic frequency control for carrier-wave receivers

Also Published As

Publication number Publication date
GB488266A (en) 1938-07-04
DE658977C (de) 1938-04-21
NL51884C (enrdf_load_stackoverflow)
FR813746A (fr) 1937-06-08
GB487687A (en) 1938-06-23

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