US2251068A - Receiver with automatic tuning - Google Patents

Receiver with automatic tuning Download PDF

Info

Publication number
US2251068A
US2251068A US281025A US28102539A US2251068A US 2251068 A US2251068 A US 2251068A US 281025 A US281025 A US 281025A US 28102539 A US28102539 A US 28102539A US 2251068 A US2251068 A US 2251068A
Authority
US
United States
Prior art keywords
switch
push button
positions
condenser
tuning
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
US281025A
Other languages
English (en)
Inventor
Rinia Herre
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.)
RCA Corp
Original Assignee
RCA Corp
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 RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US2251068A publication Critical patent/US2251068A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • H03J5/12—Settings determined by a number of separately-actuated driving means which adjust the tuning element directly to desired settings
    • 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
    • H03J1/066—Constructional details regarding potentiometric setting of voltage or current variable reactances

Definitions

  • Such a transmission mechanism makes the apparatus more expensive and more bulky and requires high precision construction.
  • the invention has for one of its objects to permit the use of a very simple transmission mechanism between the push buttons and the tuning means.
  • the automatic tuning of one or more oscillatory circuits is efiected by the displacement of a ferro-magnetic body in the field of a self-indu'ction coil connected in the oscillatory circuit concerned.
  • a rectilinear movement of a push-button is converted into a rectilinear movement of one 01' more iron cores which are each arranged in the self-induction coil of an oscillatory circuit.
  • the proportion of the maximum self induc ance to the minimum self-inductance is with iron core coils generally comparatively slight and such is more particularly the case with such a slight displacement of the iron cores in the inductance coils.
  • intermediate wave range may be divided, for example, into two or more portions.
  • This wavelength switch permits the switch of an additional condenser in parallel with the oscillatory circuit.
  • the inductance coil of the oscillatory circuit may comprise two windings which may be connected either in series or in parallel with one another.
  • the condenser or the inductance coil is switchedover. Switching over the condenser is a little simpler than switching over the inductance coil.
  • the impedance of the circuit depends, however, on the capacity of the condenser so that when switching over the inductance coil the impedance of the circuit remains substantially constant from one range to another.
  • one or more push buttons are preferably mechanically coupled with the wavelength switch in such manner that upon pressing in the push button considered the wavelength range desired is automatically selected.
  • the coupling between a push button and the wavelength switch may be made either fixed or adjustable.
  • Fig. 1 represents a portion of a radio receiver which comprises a plurality of push buttons which each correspond to a predetermined station and of which only one, denoted by I, is shown in the figure;
  • Fig. 2 is a section through the guiding cylinder of the push button I at the line AB; and Figures 3A, 3B, and 3C are circuit diagrams which illustrate certain possible connections of the wave band switch shown in Figure 1.
  • the push button 1 In automatically tuning to a station adjusted beforehand, for example the push button 1 is pressed in.
  • a plate 6 common to all the push buttons is thus displaced against the action of a spring which is not shown in the drawing, by a pin 8 which is secured, by means of a screw thread, in the push button I.
  • the plate 6 has secured to it a rod 5 on which are mounted the iron cores of the inductance coils of the oscillatory circuits which are to be tuned.
  • One of these cores, which is denoted by 4 moves, owing to the displacement of the plate 6, into a coil cylinder 3 on which two windings I and 2 are provided. The self-induction of these windings depends on the position of the iron core 4.
  • the two windings I and 2 form an oscillatory circuit which may be tuned to various wavelength ranges with the aid of a switch III.
  • the switch I has three positions in which, respectively, for the long wave range the two windings I and 2 connected in series are connected in parallel with the condenser 9, for the one por-- tion of the intermediate wave range the two windings I and 2 are connected in parallel with the condenser 9 and for the other portion of the intermediate wave range the two windings I and 2, together with a condenser H, are connected in parallel with the condenser 9.
  • the wave length switch It] consists of a stator I2 and a rotor I3 and is shown in the figure in its intermediate position.
  • the stator has two groups of three contacts I4, I5, I8 and IT, IS, IS.
  • the contacts I 4 and I! are connected to one another whilst the condenser II is connected between the contacts l5 and IS.
  • the contact I5 is connected, by means of a conductor 26, to one of the terminals of the condenser 9 and to one of the terminals of the winding I.
  • the contact I9 is connected, through the intermediary of a conductor 2
  • the switch I8 may be removed from its intermediate position by either of two electromagnets 26 and 27 which, upon being excited, draw a piece of soft iron 28 which is secured to the rotor I 3 either to the left or to the right.
  • the contact 29 is interrupted with the result that the magnet coil switched into circuit becomes without current.
  • the exciting current which is taken from a source of voltage located between the terminals 30 and 3
  • the metallic cap 32 of the push-button 1 contains a rod 33 which is resiliently slidable in the longitudinal direction in a guiding cylinder 34 whilst a projecting rim 35 prevents it from falling out.
  • the contacts 36 and 3! with which this red can establish an electric connection are located in saw-notches in the guiding cylinder of the push-button 'I. This is also distinctly shown in Fig. 2 which represents a section through the said cylinder at the line AB in Fig. 1.
  • the cap 32 is connected to ground G through push button I.
  • terminal 3! Cap 32 is constructed so that it may be placed in four different positions by rotation of the same with respect to the frame. Preferably the arrangement is such as to permit four positions which differ from one another by 90".
  • the contact 31 will be connected to ground G through rod 33 when push button I is depressed thereby energizing magnet 2'! through the following circuit: grounded contact 31, conductor 31, winding of magnet 2?, switch 29, arm 28, conductor 36, terminal 3c, source of current (not shown) connected between terminals 30 and BI, terminal 3
  • Energization of the magnet 27 causes the rotor I3 to be rotated counterclockwise due to the pull of magnet 2'!
  • cap 32 If cap 32 is rotated 180 from the position shown in the drawing, then upon depression of push button "I, rod 33 will connect contact 36 to ground.
  • magnet 26 will be energized through the following circuit: grounded contact 35, conductor 35, winding of magnet 36, contact 29, arm 28, conductor 36', terminal 35, source of current (not shown) connected between terminals 39 and 3 I, terminal 31 and ground G.
  • the rotor I3 Upon energization of magnet 26, the rotor I3 will be rotated clockwise thereby relating coils I and 2 and condenser 8,as shown in Figure 3C,
  • the pin 8 may be screwed to and fro so that in the wavelength range selected with the aid of the cap a station may be adjusted.
  • the cap has a position such that the rod 33 does not make contact with either or 31 the switch It] remains in its middle position.
  • the drawing there is shown a direct transmission between the push button and the iron cores. It is also possible, however, to effectuate this transmission with the aid of levers.
  • the preadjustment of the iron cores to a predetermined station is, preferably efiected at the place of the cores since thus greater accuracy is generally obtained than in the case of preadjustment at the place of the push buttons.
  • an adjustable tuning means adapted to be automatically tuned substantially to any frequency within any one of a plurality of wave bands
  • a selectively operable device acting upon operation to adjust the tuning means to a predetermined position operable means coupled for operation with said selectively operable device, said operable means being independently settable to any one of a plurality of different positions
  • operable wave band switching means which when in one position adjust the radio receiver for operation within one of said wave bands and when in another position adjust the radio receiver for operation within another of said wave bands and when in still another position adjust the receiver for operation within a third wave band
  • means controlled by said selectively operable device and said independently settable operable means when set to one of its positions and acting upon operation of said selectively operable device for first placin the switching means in a predetermined one of its positions at the time of operating the selectively operable device and thereafter causing the switching means to assume one of its other positions.
  • said selectively operable device comprises a member adjustable with respect to the tuning means whereby the position which the tuning means assumes upon operation of said selectively operable device may be adjustably predetermined.
  • a tunable radio receiver which is provided with a push button tuning instrumentality and a wave band change-over switch for adjusting the receiver to tune over any one of a plurality of wave bands, at least one of the push buttons of said tuning instrumentality being rotatable about its axis to various angular positions, means connected with said push button for controlling the operation of said change-over switch upon depression of the push button, said means being arranged so as to operate the change-over switch to adjust the receiver for reception of signals in one of said wave bands upon depression of said push button when said push button is in one of its angular positions and to operate the change-over switch for reception of signals in another wave band upon depression of said push button when said push button is adjusted to another of its angular positions.
  • a variable tuning means selectively operable push button devices acting upon selective operation thereof to adjust the tuning means to different predetermined positions
  • a wave-band change-over switching means for adjusting the signalling apparatus for operation within any one of a plurality of different wave bands
  • at least one of said push button devices being provided with means adjustable to different positions and operative upon depression of said push button device for controlling the operation of said change-over switch
  • said adjustable means acting to operate the changeover switch to adjust the signalling apparatus for operation in one of said Wave bands upon operation of said push button device when said adjustable means is in a predetermined one of its positions and to operate the change-over switch to adjust the signalling apparatus for operation within another one of said wave bands upon operation of said push button device when said adjustable device is in another one of its positions.

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Push-Button Switches (AREA)
US281025A 1938-07-14 1939-06-24 Receiver with automatic tuning Expired - Lifetime US2251068A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL211393X 1938-07-14

Publications (1)

Publication Number Publication Date
US2251068A true US2251068A (en) 1941-07-29

Family

ID=19778843

Family Applications (1)

Application Number Title Priority Date Filing Date
US281025A Expired - Lifetime US2251068A (en) 1938-07-14 1939-06-24 Receiver with automatic tuning

Country Status (6)

Country Link
US (1) US2251068A (enrdf_load_stackoverflow)
BE (1) BE435445A (enrdf_load_stackoverflow)
CH (1) CH211393A (enrdf_load_stackoverflow)
FR (1) FR857724A (enrdf_load_stackoverflow)
GB (1) GB531102A (enrdf_load_stackoverflow)
NL (1) NL54001C (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2469189A (en) * 1946-05-03 1949-05-03 Oak Mfg Co Preselector for radio-frequency network
US2534768A (en) * 1948-10-08 1950-12-19 Belmont Radio Corp Television tuner
US2855507A (en) * 1953-07-07 1958-10-07 Blaupunkt Werke Gmbh Radio tuning keyboard with interlocking station and band keys with independently depressable band keys

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2469189A (en) * 1946-05-03 1949-05-03 Oak Mfg Co Preselector for radio-frequency network
US2534768A (en) * 1948-10-08 1950-12-19 Belmont Radio Corp Television tuner
US2855507A (en) * 1953-07-07 1958-10-07 Blaupunkt Werke Gmbh Radio tuning keyboard with interlocking station and band keys with independently depressable band keys

Also Published As

Publication number Publication date
FR857724A (fr) 1940-09-26
GB531102A (en) 1940-12-30
CH211393A (de) 1940-09-15
NL54001C (enrdf_load_stackoverflow)
BE435445A (enrdf_load_stackoverflow)

Similar Documents

Publication Publication Date Title
US2551228A (en) Tuning means for resonant transmission lines
GB559717A (en) Improvements in or relating to variable tuning systems for radio signal receiving apparatus and the like
US2140770A (en) Electrical coupling device
US2251068A (en) Receiver with automatic tuning
US2882392A (en) Receiver tuned by inductors with tracking by initial positionment of coils on cores
US2379284A (en) Radio receiver control means
US2209959A (en) Radio receiving system
US3559075A (en) Tuning circuit for multi-band receiver using variable capacitance diodes
US2430886A (en) Electrical selector switching apparatus
GB571836A (en) Improvements in or relating to variable permeability tuning arrangements for radio or like apparatus with band-spread tuning
US2248242A (en) Radio tuning system
US2312211A (en) Tuning system
US2821624A (en) Ultra-high frequency television converter with decade-tuning turret having unit-tuning vernier
US2390768A (en) Variable selectivity amplifier
US2771547A (en) Multiband frequency selector and frequency converter
US2028534A (en) Variable-selectivity radio receiver
US2843683A (en) Television tuner input circuit
US2867765A (en) Tuner and range switch
US2748286A (en) Combined very-high-frequency and ultra-high-frequency tuner for television receiver
US2446003A (en) High-frequency coupling device
US2209982A (en) Oscillator tuning system
US2729796A (en) Band pass coupling circuit
US2922881A (en) Manual control having rotatable and tiltable stepped cam for television tuner
US2266525A (en) Wave range switching mechanism
US2503923A (en) Triple tuned high-frequency transformer