GB739765A - Improvements in or relating to radio receivers employing crystal triodes - Google Patents

Improvements in or relating to radio receivers employing crystal triodes

Info

Publication number
GB739765A
GB739765A GB1099854A GB1099854A GB739765A GB 739765 A GB739765 A GB 739765A GB 1099854 A GB1099854 A GB 1099854A GB 1099854 A GB1099854 A GB 1099854A GB 739765 A GB739765 A GB 739765A
Authority
GB
United Kingdom
Prior art keywords
circuit
base
collector
battery
half cycles
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
Application number
GB1099854A
Inventor
Bent Bulow Jacobsen
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
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
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB1099854A priority Critical patent/GB739765A/en
Publication of GB739765A publication Critical patent/GB739765A/en
Expired legal-status Critical Current

Links

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
    • H04B1/24—Circuits for receivers in which no local oscillation is generated the receiver comprising at least one semiconductor device having three or more electrodes

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

739,765. Transistor receiving apparatus. STANDARD TELEPHONES & CABLES, Ltd. April 14, 1954, No. 10998/54. Classes 40 (5) and 40 (6). In a detector circuit mounted in a telephone receiver case 17, the input is applied to the unbiased emitter-base circuit 3, 2 of a transistor, the receiver windings 9 being arranged in the collector-base circuit 4, 2 polarized from a bias supply 11. Positive-going half cycles of carrier from tuned circuit 5, 8 cause the emitterbase circuit to conduct, an amplified signal appearing in the collector-base circuit. Negative-going half cycles cut off the emitter current flow so that detection of the amplitude modulated carrier results. The telephone 9 may be shunted by a by-pass capacitor 12 and a protective resistor 10 included. In a modification, Fig. 4 (not shown), the base 2 is tapped on to the inductor 5 to provide positive feed-back. The aerial is attached to terminal 6 and battery to terminals 13, 14. Alternatively the battery may be mounted in the earpiece. The case 17 serves as an earth conductor connected to the wearer.
GB1099854A 1954-04-14 1954-04-14 Improvements in or relating to radio receivers employing crystal triodes Expired GB739765A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1099854A GB739765A (en) 1954-04-14 1954-04-14 Improvements in or relating to radio receivers employing crystal triodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1099854A GB739765A (en) 1954-04-14 1954-04-14 Improvements in or relating to radio receivers employing crystal triodes

Publications (1)

Publication Number Publication Date
GB739765A true GB739765A (en) 1955-11-02

Family

ID=9978166

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1099854A Expired GB739765A (en) 1954-04-14 1954-04-14 Improvements in or relating to radio receivers employing crystal triodes

Country Status (1)

Country Link
GB (1) GB739765A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2214740A (en) * 1988-02-01 1989-09-06 Victor Thomas Edmonds Personal single station public broadcast radio receiver

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2214740A (en) * 1988-02-01 1989-09-06 Victor Thomas Edmonds Personal single station public broadcast radio receiver
GB2214740B (en) * 1988-02-01 1992-02-26 Victor Thomas Edmonds Personal single station public broadcast radio receiver

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