US1764323A - Radio receiving system - Google Patents

Radio receiving system Download PDF

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Publication number
US1764323A
US1764323A US164492A US16449227A US1764323A US 1764323 A US1764323 A US 1764323A US 164492 A US164492 A US 164492A US 16449227 A US16449227 A US 16449227A US 1764323 A US1764323 A US 1764323A
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US
United States
Prior art keywords
inductor
regeneration
circuit
inductors
frequency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US164492A
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English (en)
Inventor
Vernon D Landon
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.)
Westinghouse Electric Corp
Original Assignee
Westinghouse Electric 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
Priority to NL25399D priority Critical patent/NL25399C/xx
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US164492A priority patent/US1764323A/en
Application granted granted Critical
Publication of US1764323A publication Critical patent/US1764323A/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

  • My invention relates to radio receiving systems, and particularly to systems in which the principle of regeneration is utilized in order to increase the sensitivity and selectivity thereof.
  • One object of my invention is to provide a. system in which critical regeneration may be secured over a wide range of frequencies without the necessity of a multiplicity of controls.
  • Another object of my invention is to provide a receiving system in which critical regeneration may be obtained over a wide range of frequencies without resorting to constant readjustment of the energy feedback controlling elements.
  • Another object of my invention is to provide a semifixed regeneration-control system for a radio receiving set by which substantially constant regeneration may be obtained over the tuning range Without changing the adjustment thereof.
  • A' further object of my invention is to provide an improved inductor-assembly particularly adaptable for use in a radio receiving system.
  • adjusting elements have taken various forms, such as rotatable coils, known as tickler coils, fixed coils shunted by variable reactors, or variable feed-back condensers between the plate and grid circuits of a thermionic tube, but, with none of the devices of the prior art, has the desideratum of critical regeneration over the entire tuning range been obtained, except by constant and careful adjustment.
  • I cause the feed-back energy to traverse two separate tickler systems, one of which is mainly operative to cause regeneration at the higher frequencies and one at the lower frequencies, and I so proportion the relative values of these systems and the amount of magnetic coupling between them and the circuit in which .the feed-back energy is tobe utilized that the amount of feed-back is always independent of the frequency.
  • Figure 1 is a diagrammatic view of a radio receiving system embodying a pre- 'ferred form of my invention.
  • Figs. 2 and 3 are, respectively, a longitudinal sectional and an end elevational View of an inductor-assembly that has been found to be advantageous in an actual embodiment of my invention.
  • an energyreceiving structure which comprisesan antenna 1, a tuning condenser 2, an inductor 3 and a ground connection 4, and which is inductively coupled to the input circuit of a radio-frequency amplifier 5.
  • the radio-frequency amplifier comprises a thermionic device 6 having a filament 7, a grid 8 and a plate 11, and is provided with an input circuit comprising an inductor 12 and a tuningcondenser 13.
  • the filament 7 is energized from a battery 14:.
  • the thermionic device 6 is provided with an output circuit comprising an inductor 15 connected in series between the plate l'l-and the positive terminal of a battery 16, the negative terminal of which is connected to the filament 7.
  • the plate-potential battery 16 may be e shunted by a condenser 17 of large capacity,
  • a second thermionic device 21 is employed to act as a detector.
  • the thermionic device comprises a filament 22, a grid 23 and a plate 24, and the filament 22 thereof may be energized from the battery 14 which energizes the radio-frequency amplifier device 6.
  • the thermionic device 21 is provided with an input circuit comprising an inductor 25 shunted by a tuning condenser 26.
  • a grid condenser 27 and grid leak 28 are interposed between the inductor 25 and the grid 23, as is customary.
  • a tuned circuit comprising an inductor 29 and a condenser 30, in parallel, is connected in series with an additional inductor 31, the series connection extending from the plate 2% to a suitable point on the battery 16.
  • the inductors 29 and 31 coupled W 3rd electromagnetically to the input inductor 25.
  • a pair of telephones 32 is included between the inductor 31 and the connection to the battery. The telephones are preferably shunted by a small condenser 34 to provide a path for radio-frequency currents.
  • R is large, as compared with Z., and the tickler current is about 189 out of phase with the applied grid voltage and substantially in phase with the effective signal voltage in the plate circuit, 1 E
  • the inductor 29 and the condenser 30 constitute a tuned circuit which is resonant to a frequency preferably below the lowest frequency 'tow'hich the receiver is designed 'to .be tunable; hence, at any frequency within the tuning range, this circuit will act as a capacitance, the value of which decreases with decrease in the applied frequency.
  • the value of the compensating inductor 29 is not critical, though I have found that Very good results are obtained if the inductance thereof is approximately twice that of the input inductor 25. If the inductance is too high, the consequent reduction in capacity of the condenser so decreases the A. C. compo ent of the plate current at high frequencies that oscillation is obtainable only with difficulty; if too low, it is diflicult to obtain the proper balance.
  • the inductor 29 has a value of 500 microhenries and the condenser 30 of 600 microfarads, which gives a resonance frequency of 290 kilocycles.
  • I n equip the movable coil with lllfti1llfi,...,. trollable adjusting means and to so arr the apparatus that the adjusting mean accessible from the exterior of e.
  • a c drical form 41 of insulating ma l ports the inductor 25, which is r a single-layer winding.
  • a plurality of rotat- Liv table bearing devices 42 and i8, and sr. ported thereon in the interior of the i" 41 is a small cylinder a l of insulati I terial carrying the inductor
  • the inductor 15, which preferably of the duo-lateral or universal type, is positioned at the end of the cylindrical form 41 opposite to that in which is mounted the rotatable inductor 31.
  • a small tube 4 5 of insulating material. is mounted radially of the cylindrical form :31 and carries, on its inner end, a small cylindrical form 46, also of insulating material.
  • the tube 45 and the cylindrical form 4:6 are maintained in position byv a bolt 17 provided with a lock nut 48.
  • the cylindrical form 46 carries the inductor 29, which is also preferably of the duo-lateral or universal type, and maintains it in inductive relation to the large duo-lateral inductor 15 and also to the single layer winding
  • the cylindrical form l6, on which inductor 29 is mounted may be rotated by loosening the nut 48, and may be adjusted during manufacture of the apparatus to the position giving the best results.
  • a tunableradio system comprising thermionic devices, means for securing critical regeneration over the entire tuning range, said means comprisin a plurality of inductors in an output circuit each regeneratively backcoupled to an input circuit, and means whereby one of said inductors is a more eflicient feed-back agent at low frequeneies than another of said inductors.
  • a tunable radio system comprising thermionic devices,means for securing critical regeneration over the entire tuning range, said means comprising a plurality of inductors in an output circuit, each inductor being variably coupled to an i'nputci-rcuit in the sense to promote regeneration, and means whereby one of said inductors is a more eilicient feed-back agent at high frequencies than another of said inductors.
  • a tunable radio system comprising thermionic devices, an input circuit for one of said devices, an output circuit for one of said devic s, a plurality of ineuctors in said output circuit each baclrcoupled to said input circuit in the sense to cause regeneration, and means whereby such regeneration is substantially uniform over the tuning range of said system.
  • a tunable radio system comprising thermionic devices, an input circuit for one of said devices, an output circuit for one of said devices, a plurality of inductors in said output circuit back-coupled to said input circuit in the sense to promote regeneration, and means whereby one of said inductors has a natural frequency below the tuning range of said system.
  • a tunable radio system comprising thermionic devices, an input circuit for one of said devices, an output circuit for one of said devices, a plurality of inductors in said output circuit back-coupled to said input circuit in the sense to promote regeneration, means whereby the coupling of certain of said inductors may be manually adjusted, and means for insuring that one of said inductors will be a more eilicient feed-back agent at low frequencies than at high frequencies.
  • a tunable radio system comprising thermionic devices, an input circuit for one of said devices, an output circuit for one of said devices, an inductor in said output circuit back-coupled to said input circuit for securing regeneration chiefly at frequencies toward the high end of the tuning range, and another inductor for securing regeneration chiefly atfrequencies toward the low end of the tuning range whereby regeneration at all frequencies is substantially equal.
  • a tunable radio system comprising thermionic devices, means for securing criti cal regeneration over the entire tuning range, said means comprising a plurality of inductors, means whereby one of said inductors is given a natural frequency below the tuning range of the system, and means for securing oscillation at any frequency in the range.
  • a thermionic device having a tunable input circuit and an output circuit, a plurality of inductors in said output circuit both of which are back-coupled to said input circuit for securing regeneration, means whereby one of said inductors is a more efiicient feed-back agent at low than at high frequencies, and means whereby oscillations may be produced in said system at any frequency in the tuning range thereof.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Semiconductor Integrated Circuits (AREA)
US164492A 1927-01-29 1927-01-29 Radio receiving system Expired - Lifetime US1764323A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL25399D NL25399C (en, 2012) 1927-01-29
US164492A US1764323A (en) 1927-01-29 1927-01-29 Radio receiving system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US164492A US1764323A (en) 1927-01-29 1927-01-29 Radio receiving system

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US1764323A true US1764323A (en) 1930-06-17

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US164492A Expired - Lifetime US1764323A (en) 1927-01-29 1927-01-29 Radio receiving system

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US (1) US1764323A (en, 2012)
NL (1) NL25399C (en, 2012)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2659776A (en) * 1949-05-13 1953-11-17 Nowak Karl Selective receiving and amplifying circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2659776A (en) * 1949-05-13 1953-11-17 Nowak Karl Selective receiving and amplifying circuit

Also Published As

Publication number Publication date
NL25399C (en, 2012)

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