US2024807A - Radio apparatus - Google Patents

Radio apparatus Download PDF

Info

Publication number
US2024807A
US2024807A US644951A US64495132A US2024807A US 2024807 A US2024807 A US 2024807A US 644951 A US644951 A US 644951A US 64495132 A US64495132 A US 64495132A US 2024807 A US2024807 A US 2024807A
Authority
US
United States
Prior art keywords
frequency
receiver
inductor
converter
circuit
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
US644951A
Other languages
English (en)
Inventor
John D Reid
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
Priority to US644951A priority Critical patent/US2024807A/en
Priority to DER89334D priority patent/DE643816C/de
Application granted granted Critical
Publication of US2024807A publication Critical patent/US2024807A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/06—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes
    • H03D7/10—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes the signals to be mixed being applied between different pairs of electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/10—Measures concerning design or construction of watercraft hulls

Definitions

  • My invention relates to radio apparatus and, a radio receiving system that shall be capable more particularly, to radio receivers adapted to cover a wide frequency range.
  • the converter prefferably provides a continuously variable oscillator and with a detector, the tuning of which is also continuously Variable, the several tuningk devices, usually variable condensers, being interconnected for simultaneous operation and a single indicating scale being utilized to indicate the tuning.
  • converters In order that a number of short-wave bands may be covered, converters, as a rule, have been provided with a plurality of interchangeable inductors of the plug-in type. Since the same tuning condensers are used, however, virrespective of the particular band it is desired to cover, such converters have a rather serious drawback, namely, the crowding together of the frequency-channels with respect to the dial-scale as the inductance of the coils decreases.
  • Another object of my invention is to provide of covering widely separated frequency ranges without the use of plug-in coils.
  • Another object of my invention is to provide a combined long-short wave radio receiver that y shall be more efficient on the several frequency ranges than analogous receivers heretofore known.
  • FIG. 1 is a diagrammatic view of a radio receiving system including a preferred embodiment of my invention
  • Fig, 2 is a rear elevational view of a commercial broadcast receiver modified according to my invention.
  • a radio receiving system including a preferred embodiment of my invention is constituted by a frequency converter portion I, and a radio receiver portion 3, the latter, preferably, being of the uni-control superheterodyne type.
  • 'Ihe converter portion is constituted by a detector tube 5, and an oscillator tube each tube being provided with input and output circuits whereby incoming radio signals and locally generated oscillations may be combined to form beat frequencies.
  • the detector tube in order that maximum sensitivity may be had, is preferably of the screen grid pentode type having an anode 9, a suppresser grid Il, a screen grid I3, a control grid I5, a cathode H, and a heater I9.
  • the oscillator tube may be of the three-electrode type having an anode 2
  • the detector tube and the oscillator tube not with variable tuned input circuits, but with broadly tuned circuits which may be varied in a step-by-step manner to select the desired frequency band.
  • the input circuit of the detector tube is constituted by an inductor 29, one end of which is connected to the control grid of the detector and the other end of which is connected through a conductor 3
  • the inductor is provided with three intermediate taps from which leads extend, respectively, to switch points designated in the drawing 33, 35, and 31.
  • a plurality of Vcapacitors 3S having a capacity of at least 5000 mmf. are connected between the cathodes of the'detector and oscillator tubes and the conductor 3
  • a fourth switch point 39 is provided, to which no part of the system is permanently connected,
  • a connection 43 extends to the control grid of the input inductor.
  • a movable contact member 45 Associated with the switch points is a movable contact member 45, connected to the chassis and the low potential end of the input conductor over the conductor 3
  • An adjustable capacitor 41 is connected in shunt to the entire input inductor and, depending upon with which of the points 33, 35, 31, and 39 the movable contact member 45 isV associated, the input circuit is tuned to approximately the middle of any one of four short-Wave bands.
  • directly connected to the grid end of the inductor is utilized to short-circuit the input inductor in the event that it is desired to receive signals, in the broadcast band, directly upon the radio-receiver portion 3 of the system. The manner in which this is accomplished will be more fully explained hereinafter.
  • the cathodes of the oscillator and rst detector tube are connected to the chassis of the converter through a self-biasing resistor 49 shunted by a condenser 5
  • the oscillator is provided with an input inductor 50 with which are associated a plurality of semi-fixed tuning capacitors 50, 53, 55, and 51, one -terminal of each of the capacitors being connected to the grid end of the inductor, and the other terminals thereof being conductively connected, respectively, to a plurality of switch points 59, 6
  • a feed-back inductor 66 in the anode circuit of the oscillator, is coupled to the input inductor 50.
  • the low potential end of the oscillator input inductor is connected to the converter chassis over the conductor 3
  • An additional switch point 69 analogous to the point 4
  • An inductor 1D included in the screen-grid circuit of the detector tube, is inductively coupled to the oscillator input and output inductors, whereby locally generated oscillations may be impressed upon the detector.
  • is coupled to the detector tube input inductor, one end of the coil terminating in a binding post 13 or a flexible lead adapted to be connected to an antenna, and the other ⁇ end being connected to an elongated switch point 15, or to a plurality of inter-connected points, (not shown) corresponding in arc to the first four positions of the switching devices associated, respectively, with the detector tube and the oscillator tube.
  • An additional unconnected switch point 11 is also provided. With the points 15 and 11 is associated a movable contact member 19 connected to the converter chassis o-ver the conductor 3
  • the several switches are connected together for simultaneous actuation as indicated by a dotted line 8
  • the converter is supplied with screen grid, anode, and heater potentials from the potential supply system in the radio receiver proper.
  • the radio receiver which I have chosen to exemplify my invention is of the uni-control superheterodyne type having a radio frequency amplier tube 83, an oscillator tube 85, a iirst detector tube 01, an intermediate frequency amplifier tube 89, a second detector tube 9
  • the receiver need not necessarily be of the uni-control type, though this is desirable, since the specic manner in which the radio frequency circuits and the oscillator circuit of the standard wave receiver are tuned forms no part of my present invention. It is fairly important, however, that the input or antenna coil of the receiver have a natural frequency below the low end of the range from which the receiver tunes, for best results.
  • the output tube 93 is of the screen grid pentode type having a cathode-heater supplied from a secondary winding 91 on the main power transformer in the receiver and being supplied with screen grid potential from the receiver rectifier, (not shoum), over a conductor 99.
  • the converter portion of my improved receiver may be provided with screen grid, anode and heater potentials, I interpose an adaptor plug mi between the prongs of the output tube 93 and its socket, (not shown), the several potentials then being available to the converter over conductors
  • the screen grid of the detector tube and the anode lof the oscillator tube are supplied withl It will also be noted that, wheny the movable contact member 19 associated with the detector input circuit is in any one of the rst four positions, an inductor ⁇
  • The-inductor is of Such size that, when so connected in shunt to the input inductor, the two inductors in parallel have a natural resonant period lying approximately in the middle of the range vof beat frequencies which the converter is intended to develop.
  • the converter functions to simultaneously heterodyne a plurality of incoming signals, depending upon the position of the movable switch arms, and a plurality of beat frequencies are simultaneously impressed upon -thereceiverportion.
  • the constants of the system are so chosen that, irrespective of the band being covered, the-beat fre quencies produced fall withinthe tuning range of the receiver and the separation of the desired signal from those undesired is accomplished through adjustment of the tuned circuits in the receiver.
  • the radio receiver portion therefore, may be tuned, as usual, and, although the input signal thereto is not the original short Wave itself, but a beat frequency produced therefrom, the receiver-dial markings, if calibrated in 10 kc. divisions, still represent 10 kilocycle separation.
  • FIG. 2 of the drawing which is a back view of a commercial radio receiver modied according to my invention
  • I find it eX- pedient to mount the converter unit I upon the inner surface of one of the side walls
  • the shielding container constitutes the chassis 32 of the converter portion referred to above.A
  • an appropriately inscribed escutcheon plate surrounds the switch actuating knob
  • the band Waves covered by the converter when the switch is in the first four positions are respectively 15,340 to 15,000 kc.; 11,900 to 11,700 kc.; 9,600 to 9,500 kc.; and 6,150 to 6,000 kc.
  • the band width in kilocycles is not greater than 250 kc., which range is easily handled by the usual radio receiver that is designed to cover the standard broadcast range of 1,500 to 550 kc.
  • shielding braid be grounded into the receiver chassis.
  • This trap may be so constructed as. to attenuate the entire broadcast band, or it may be specilically designed to reject the most troublesome lnterfering stations.
  • 33 to the switch point 'l5 is provided.
  • This antenna serves as additional ground area during short wave reception, and, if desired, it may be 25 erected to function as a counterpoise.
  • the receiver itself preferably, should not include any exposed coils which function at radio frequency and it is very desirable that no unshielded leads be outside of the chassis 30 shield.
  • a radio receiver In a radio receiver, a broadly tuned frequency converter portion, a relatively sharply tunable beat-frequency amplifier portion, switching and circuit means for effecting a connection for an energy collector to either portion, at will, 55 and means simultaneously operable with said switch means for altering the input circuit constants of said amplifier portion, and said rst named means including a permanent connection between the amplifier portion and the connection 60 for said energy collector.
  • a radio receiver In a radio receiver, a broadly tuned frequency converter portion, a relatively sharply tunable beat-frequency amplifier portion, a plurality of antennae, switching and circuit means 65 for at will connecting one of said antennae to the frequency converter portion and grounding the other antenna or removing the ground connection from the last-mentioned antenna and effectively coupling it to the input circuit of the beat fre- 70 quency amplier portion, and means providing a connection for the frequency converter portion with the input circuit of said beat frequency amplifier portion.
  • a receiver 75 i verter coupled jointly to said inductor, means for decoupling said antenna circuit, selector means for tuning said frequency converter to provide a plurality of beat frequency signals, means for tuning said input circuit to a predetermined frequency, and means for rendering said frequency converter inoperative to produce beat frequency signals.
  • a tunable radio receiver having a signal input circuit, of a broadly ⁇ tuned frequency converter comprising an electric discharge oscillator tunable selectively to each one of a plurality of different signal frequencies, a switch for effecting said selective tuning, a detector coupled to said oscillator., said detector having an output anode circuit connected with said receiver input circuit, a tuning inductor for said input circuit, an antenna circuit coupled to said detector through said anode circuit connection, means for selectively tuning said detector to each one of a plurality of 4signals at differing frequencies, said selecting means including a switch, selector means for connecting said antenna circuit to ground and said tuning inductor across said input circuit, said last-named means including Ya selector switch, and means for simultaneously operating said switches.
  • an oscillator circuit comprising an inductor, a plurality of semifixed tuning condensers therefor and a selector switch for selectively connecting each of said condensers with said inductor to tune it
  • a detector comprising an electric discharge device having a signal input grid and an electrode other than said grid coupled to said oscillator inductor, an input circuit for said detector comprising a second inductor and selector means for tuning said inductor to a plurality of different signal frequencies, an antenna circuit coupled to said last-named inductor, means forr grounding said antenna circuit through said coupling means, an output anode circuit, for said detector connected with the receiver input circuit, means providing a signal conveying connectionbetween the antenna circuit and said receivervinput circuit through said output anode circuit connection, and a tuning inductor for said input circuitV in said last-named connection.
  • a broadly tuned fre- 5 quency convertor portion In a radio receiver, a broadly tuned fre- 5 quency convertor portion, a relatively sharply tunable 'beat-frequency amplifier portion, and switching and circuit means for effecting a connection for an energy collector to either means,
  • said last named means including a coupling windy ing means including contacts for grounding said M last named end of the coupling winding when operating in a predetermined higher frequency range.
  • a radio receiving Ysystem including a tunable signal receiving portion anda frequency cony vertor portion
  • a frequency convertor tube in said last named portion having an output anode circuit coupled to said tunable signal receiving portion-an antenna circuit coupled tol the input electrode of said frequency convertortube and including a coupling winding, one end of which is connected to the anode circuit through a series condenser and high frequency choke coil, and switching meansv for selectively connecting said end of the coupling winding to ground.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Superheterodyne Receivers (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
US644951A 1932-11-30 1932-11-30 Radio apparatus Expired - Lifetime US2024807A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US644951A US2024807A (en) 1932-11-30 1932-11-30 Radio apparatus
DER89334D DE643816C (de) 1932-11-30 1933-11-29 UEberlagerungsvorsatzstufe zum Empfang kurzer Wellen mit Empfaengern fuer laengere Wellen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US644951A US2024807A (en) 1932-11-30 1932-11-30 Radio apparatus

Publications (1)

Publication Number Publication Date
US2024807A true US2024807A (en) 1935-12-17

Family

ID=24587039

Family Applications (1)

Application Number Title Priority Date Filing Date
US644951A Expired - Lifetime US2024807A (en) 1932-11-30 1932-11-30 Radio apparatus

Country Status (2)

Country Link
US (1) US2024807A (de)
DE (1) DE643816C (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2491808A (en) * 1942-08-06 1949-12-20 Gen Electric Multichannel radio and television receiver

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE965788C (de) * 1946-09-26 1957-06-19 Fr Des Telecomm Soc Verfahren zum UEberlagerungsempfang mit stufenweiser Abstimmung auf Empfangsfrequenzen
NL89829C (de) * 1952-03-03
DE1067484B (de) * 1955-11-29 1959-10-22 Aladdin Ind Inc UEberlagerungsempfaenger fuer frequenzmaessig weit auseinander-liegende Wellenbereiche
DE1028629B (de) * 1956-11-23 1958-04-24 Siemens Ag Mehrbereich-UEberlagerungsempfaenger

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2491808A (en) * 1942-08-06 1949-12-20 Gen Electric Multichannel radio and television receiver

Also Published As

Publication number Publication date
DE643816C (de) 1937-04-17

Similar Documents

Publication Publication Date Title
US2581159A (en) Tunable band pass amplifier for television
US2443935A (en) Superheterodyne radio receiver
US2964623A (en) Receiver having two input sources and respective tuning means, one of which, when selected, grounds the non-used source for both incoming interference and outgoing radiation signals
US2151810A (en) Superheterodyne receiver
US2024807A (en) Radio apparatus
US2137266A (en) Multiband receiver
US2816222A (en) Mixing circuit for superheterodyne receivers
US2323924A (en) Superheterodyne receiver
US3275958A (en) U.h.f.-v.h.f. tuner with switchable common elements
US2692919A (en) Stabilized driven grounded grid amplifier circuits
US2273640A (en) Superheterodyne receiver
US2000084A (en) Short wave receiver arrangement
US2201938A (en) Image rejector circuit for radio receivers
US2075526A (en) Radio signal receiving system
US2530329A (en) Television receiver antenna input circuit
US1819299A (en) Tuning system
US2240295A (en) Television receiver
US2011941A (en) Radio receiving circuit
US2812433A (en) Plural band frequency converter with intermediate frequency trapping means
US2075501A (en) Radio receiving system
US2836711A (en) Universal tuning system for television receivers
US2065652A (en) Radio receiver
US2743356A (en) Tunable frequency systems of constant band width
US2745961A (en) Multiband u. h. f. oscillators
US2022805A (en) Radio receiver