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US2357442A - Radio receiver - Google Patents

Radio receiver Download PDF

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Publication number
US2357442A
US2357442A US446780A US44678042A US2357442A US 2357442 A US2357442 A US 2357442A US 446780 A US446780 A US 446780A US 44678042 A US44678042 A US 44678042A US 2357442 A US2357442 A US 2357442A
Authority
US
United States
Prior art keywords
tuned
ground
tube
circuits
stages
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
US446780A
Other languages
English (en)
Inventor
Sven H M Dodington
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.)
STC PLC
Federal Telephone and Radio Corp
Original Assignee
Standard Telephone and Cables PLC
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 BE480686D priority Critical patent/BE480686A/xx
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to US446780A priority patent/US2357442A/en
Application granted granted Critical
Publication of US2357442A publication Critical patent/US2357442A/en
Priority to CH257896D priority patent/CH257896A/de
Priority to ES0181926A priority patent/ES181926A1/es
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H04B1/22—Circuits for receivers in which no local oscillation is generated
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/42—Modifications of amplifiers to extend the bandwidth
    • H03F1/48—Modifications of amplifiers to extend the bandwidth of aperiodic amplifiers
    • H03F1/50—Modifications of amplifiers to extend the bandwidth of aperiodic amplifiers with tubes only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/06—Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges

Definitions

  • My invention relates to radio receivers and more particularly to radio frequency amplifiers.
  • a multi-stage transformer coupled radio frequency amplifier has required some variable means such as a variable shunt capacitance for adjusting the coupling device to obtain maximumamplification. While not troublesome at low frequencies, this has been a decided disadvantage in ultra high frequency circuits wherein the least possible amount capacitance is desirable.
  • the singly tuned interstage coupling circuits may be adjusted to produce a single humped frequency response characteristic and the doubly tuned coupling circuits may be adjusted so as to produce a double humped frequency response curve.
  • the latter is accomplished by increasing the coupling beyond its critical value. As the coupling is still further increased, the two curve peaks move further apart and the hollow between them becomes deeper. The combined response of two such stages will be such as to produce an amplification characteristic which will be substantially uniform throughout the band-width. To obtain uniform amplification over a wide band of frequencies, however, means of varying the doubly tuned coupling circuits has heretofore been necessary.
  • Another object of my invention is to iinprove the multi-stage type of wide band radio frequency amplifier having alternate singly and doubly coupled circuits wherein the singly coupled circuits may be tuned to compensate for the efl'ects obtained by the tuning adjustment heretofore required of the doubly coupled circuits.
  • Still another object of my invention is to improve the multi-stage type of wide-band, radio fects obtained by the tuning adjustment heretofore required of the doubly coupled circuits, the various ground points in the complete circuit being so grouped as to restrict interstage circulating currents thereby minimizing objectionable feedback to preceding stages.
  • I may accomplish the above and other objects of my invention by incorporating in a multi-stage radio frequency amplifier a means for adjusting th inductance of the tuning coil of the singly tuned circuits, for example, with an iron plunger arranged within the coil, so as to compensate for any mistuning of a preceding fixed doubly tuned coupling stage which may have been caused by error in manufacture. Feedback is minimized by grouping certain ground points so as to restrict circulating currents to their immediate circuits between stages.
  • Fig. 1 is a schematic wiring diagram of a radio frequency amplifier incorporating the features of my invention
  • Fig. 2 is a general view of a typical physical layout of the tubes and coupling devices on top of the chassis;
  • Fig. 3 is a view of a singly tuned coupling coil showing enough of the cross section to illustrate the relation of the'coil and plunger arrangement, which may be used for aligning the amplifier;
  • Fig. 4 is a series of curves showing characteristic frequency response with ideally tuned stages.
  • Fig. 5 is a series of curves showing characteristic frequency response with mistuned doubly tuned coupling circuits, and the effect of compensation according to the teachings of my invention
  • a further object of my invention is to provide an improved multi-stage, wide band, radio frequency amplifier having alternate doubly and operating at a relatively high frequency is shown wherein alternate singly tuned coupling coils 2, l and 6 and doubly tuned coupling coils 3, 5 and l v are employed between stages.
  • alternate singly tuned coupling coils 2, l and 6 and doubly tuned coupling coils 3, 5 and l v are employed between stages.
  • distributed capacities are generally sufficient to tune the circuit without added bridged condensers as in lower frequency amplifiers
  • Tuning of the single coil stages may be ac complished by known arrangements of any suitable type, such as variometer or known plunger through the shield capacitan minated at prong-like terminals 4 which project through the base to provide external connecting means.
  • a powdered iron plunger 5 which could be of any paramagnetic material, is movably mounted within the form 2; Its outside diameter is slightly less than the inside diameter of the form 2 so that it is free to be moved; A screw 6 provides a means of adjusting said plunger lengthwise within the form.
  • the entire device is inclosed in a shield can I.
  • By varying the position of the iron plunger within the coil more precise tuning is accomplished.
  • single coil stages may also be tuned by a variable cawithin a specified frequency band. No trimming adjustments are provided on these coils.
  • Other circuit elements are of such rating as to produce in cooperation with the coils, a frequency response curve similar to curve. I in Fig. 4.
  • An ultra high frequency amplifier comprising a first tube and a second tube, means coupling control grid, screen grid, suppressor grid and plate elements, a ground lead for each of said elements, the ground leads of the plate and the supground point, and the ground leads of the cathode,
  • control grid and screen grid of said first tube being connected to another ground point and the ground leads of the plate and suppressor grid of-

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Microwave Amplifiers (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
US446780A 1942-06-12 1942-06-12 Radio receiver Expired - Lifetime US2357442A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE480686D BE480686A (xx) 1942-06-12
US446780A US2357442A (en) 1942-06-12 1942-06-12 Radio receiver
CH257896D CH257896A (de) 1942-06-12 1947-07-16 Mehrstufiger Breitband-Hochfrequenzverstärker.
ES0181926A ES181926A1 (es) 1942-06-12 1948-01-29 Mejoras en aparatos radiorreceptores

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US446780A US2357442A (en) 1942-06-12 1942-06-12 Radio receiver

Publications (1)

Publication Number Publication Date
US2357442A true US2357442A (en) 1944-09-05

Family

ID=23773810

Family Applications (1)

Application Number Title Priority Date Filing Date
US446780A Expired - Lifetime US2357442A (en) 1942-06-12 1942-06-12 Radio receiver

Country Status (4)

Country Link
US (1) US2357442A (xx)
BE (1) BE480686A (xx)
CH (1) CH257896A (xx)
ES (1) ES181926A1 (xx)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2547793A (en) * 1942-01-05 1951-04-03 Hartford Nat Bank & Trust Co Slide core coil for a tuned circuit having a constant selectivity
US2581165A (en) * 1947-01-02 1952-01-01 Lionel Corp Variable tuning device
US2770683A (en) * 1952-06-18 1956-11-13 Philco Corp Neutralized amplifier circuit
US3292099A (en) * 1962-09-14 1966-12-13 Gen Electric Two-stage intermediate frequency amplifier

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2547793A (en) * 1942-01-05 1951-04-03 Hartford Nat Bank & Trust Co Slide core coil for a tuned circuit having a constant selectivity
US2581165A (en) * 1947-01-02 1952-01-01 Lionel Corp Variable tuning device
US2770683A (en) * 1952-06-18 1956-11-13 Philco Corp Neutralized amplifier circuit
US3292099A (en) * 1962-09-14 1966-12-13 Gen Electric Two-stage intermediate frequency amplifier

Also Published As

Publication number Publication date
BE480686A (xx)
ES181926A1 (es) 1948-03-01
CH257896A (de) 1948-10-31

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