US1931082A - Regenerative radioreceiver - Google Patents

Regenerative radioreceiver Download PDF

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Publication number
US1931082A
US1931082A US497368A US49736830A US1931082A US 1931082 A US1931082 A US 1931082A US 497368 A US497368 A US 497368A US 49736830 A US49736830 A US 49736830A US 1931082 A US1931082 A US 1931082A
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United States
Prior art keywords
tube
circuit
regenerative
input
tuned
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
US497368A
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English (en)
Inventor
Walter Van B Roberts
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
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Filing date
Publication date
Priority to BE384350D priority Critical patent/BE384350A/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US497368A priority patent/US1931082A/en
Application granted granted Critical
Publication of US1931082A publication Critical patent/US1931082A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/163—Special arrangements for the reduction of the damping of resonant circuits of receivers

Definitions

  • a screengrid'amplifiertube feeding should possess as great a degree of selectivity and a radio frequency system containing .regenera sensitivity as is possible without impairing too tive arrangements, the screen grid tube being fed greatly its fidelity.
  • a resonant collecting circuit also containing tics it has been customary in the prior art to a regenerative arrangement, the. first mentioned employ regenerative circuits in portable receiv radio frequency system being shielded from the ers.
  • Another object of the invention is to provide a sharp (fidelity best) when sufilcient regeneraportable receiver containing atunable loop tion is used in the various tuned circuits to tenna connected acrossthex input electrodes of make their apparent tuning factors or coil efii-M a. scr'een'grid tube,,an electron discharge tube, ciencies about equal, rather than to get the decircuit for regener'ating the' input, circuit of the sired amplification all in one regeneration. That screen grid tube, and a succeeding screen grid.
  • proacteristic of my invention are set forthjinpar- 4'0 vided a tube with good, screening is utilized beticularity in thefappended claims, the invention, tween cascaded tuned circuits, so that the tunedv itself, however, asj-tobothfits organizationand circuits are thoroughly shielded from each methodof operation will best be understood" by other;
  • the total regenerative eifect is reference .to the [following description takenin truly cascaded; that is to say, the product of connection with thedrawing in which I have the two separate effects.
  • the circuit in addition, preferably comprises a pair of successive tuned circuits, both including space discharge devices 3 and 4.
  • the circuit including the device, or tube; 3
  • the tube 3 requires relatively little operating voltage, the space charge electrode 9 necessitating but six volts, the screen electrode having twenty-two volts impressed upon. it, while the anode '7 has but 45 volts impressed upon it. 1
  • the tube 3 is preferably a pentode tube in order to economize the battery voltage, it being pointed out, however, that a screen grid tube without the space charge electrode 9 'may also be utilized. It is desirable, however, that whatever type of tube be employed in place ofthe pentode tube 3, such a tube require little voltage, in order to minimize the weight of batteries usually provided in a portable radio receiver. v
  • the amplified output of tube 3 is impressed upon the input circuit of the "succeeding device,
  • a variable tuning condenser2 is connected across the coil 11 and between the cathode and control electrode of .tube 4, the usual series capacity and shunt grid leak resistance being connected in the control electrode circuit of thetube in order to permit tube '4 to function as a detector.
  • the anode circuit of tube 4 is reactively coupled to its input circuit through a coil 12, the latter being connected in series in the anode lead 13, means being providedto vary the feed-back fromthe output to the input circuit by providing a variable coupling between coils 12 and 13, such means being conventionally designated by the arrow 14.
  • the detector tube 4 preferably employs a screen grid electrode, thus permitting regeneration control as free as possible from any sudden fsnapping into oscillation.
  • Aradio frequency choke coil 15 is provided in series in' the anode lead 13 in order to by-pass radio frequency currents through'the-radio frequency condenser 16 connected between the anode and the cathode of tube 4.
  • the output circuit of detector tube 4 may be connected to any desired utilization means, the
  • the tuned input circuit which consists of the loop antenna 1 and the tuning condenser 2, of
  • the pentode tube 3 is regenerated by means of an auxiliary space discharge device, or tube, 16.
  • the control electrode of. the latter is connected to the lead 1'7 between one side of the tuning condenser 2 and the control electrode 5.
  • the cathode of tube 16 is connected between the other termi-;
  • the tube 16 is rendered regenerative by means of the conventional tuned'anode'cir'cuit arrangement comprising a variometer' 18 connected in series in the anode circuit.
  • the feed-back as is well known, is secured through the inherent capacity between the grid and anode of tube 16, such inherent'capacity 19 being shown in dotted lines.
  • a radio frequency by-pass capacity 20 is connected between thecathode and anode circuit of tube 16, while the latter is connected to a source of voltage (not shown) adapted to supply somewhat less than twenty-two volts to the anode. ;It will be appreciated that the tubev 16 I may be or" a type thatconsumes very little power,
  • the shield- 7 ing. does not include the choke coil 15, the cir-v cuits of tubes 16 or the tuned loop circuit 1, 2;
  • the shielding means being grounded, as at G. If
  • the tuning condensers 2 and 2 can be arranged for mechanical uni-control, the latterv being represented diagrammatically by the dotted lines-22.
  • the purpose of the shielding arrangement 21 is to preventthe reaction of the regenerative'circuit of the tube 4 upon the tunable loop circuit 1, 2.
  • the tunings required for best amplification may be,, such
  • a radio receiver comprising a tunable loop circuit adapted to intercept transmitted signal energy, a screened grid tubeiprovided with an output circuit and a tuned input circuit connected to the loop circuit, an electron discharge tube provided with an output circuit regenera-' tively coupled to its input circuit, said electron discharge tube being connected so as to act as a regenerative detector, means for tuning said last named input circuit, the output circuit of the screened grid tube being coupled to the input circuit of the second tube, an independent electron discharge device having its input circuit shunted directly across the input of the screened grid tube, said independent device having a tunable output circuit for regenerating the tuned input circuit of the screened grid tube whereby there is obtained in the output circuit of the second tube substantially the product of the two separate regenerative efiects, a utilizing means connecting circuit coupled to the output of the electron discharge tube including filter means comprising a path of low impedance for high frequency energy and a path of high impedancefor high frequency energy and a shielding means for shieldingly enclosing only
  • a stage of radio frequency amplification comprising a screened grid tube having input and output circuits, a loop ergy connected across said input circuit and said input circuitfor tuning said loop and input circuit to the frequency of desired signal energy, an electron discharge device having an input so circuit for intercepting transmitted signal en- 1 means comprising a variable tuning devicei n circuit andan output circuit, said input circuit thereof being linked with said output circuit of said electron discharge device to facilitate the transfer of energy from said output circuit to saidinput circuit thereof for producing regeneration, means associated withsaid electron disa charge device for giving thereto a detector tube characteristic whereby said-electron discharge device acts as a regenerative detector, means circuitof said electron discharge device for tuning the input circuit thereof, an additional electron discharge device having an input circuit and an output circuit, said inputcircuit being shunt ed directly across the input-circuit of r the screened grid tube, the input circuit of said additional electron discharge device being linked with the outputcircuitthereof to facilitate the transfer of energy from said output circuit to
  • said regenerative detector including the coupling means between the output of the screened grid p tube and the input of the regenerative detector and the path of low impedance for high fre quency energy whereby stray energy emanating from thecircuits of said regenerative detector is, in effect, localized within said shielding means and thereby substantially prevented from affecting the input circuit of the screened grid tube.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
US497368A 1930-11-22 1930-11-22 Regenerative radioreceiver Expired - Lifetime US1931082A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE384350D BE384350A (en(2012)) 1930-11-22
US497368A US1931082A (en) 1930-11-22 1930-11-22 Regenerative radioreceiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US497368A US1931082A (en) 1930-11-22 1930-11-22 Regenerative radioreceiver

Publications (1)

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US1931082A true US1931082A (en) 1933-10-17

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US497368A Expired - Lifetime US1931082A (en) 1930-11-22 1930-11-22 Regenerative radioreceiver

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BE (1) BE384350A (en(2012))

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Publication number Publication date
BE384350A (en(2012))

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