GB525404A - Improvements in electrical superheterodyne frequency-changers - Google Patents

Improvements in electrical superheterodyne frequency-changers

Info

Publication number
GB525404A
GB525404A GB2023/39A GB202339A GB525404A GB 525404 A GB525404 A GB 525404A GB 2023/39 A GB2023/39 A GB 2023/39A GB 202339 A GB202339 A GB 202339A GB 525404 A GB525404 A GB 525404A
Authority
GB
United Kingdom
Prior art keywords
frequency
changer
doubler
local oscillations
last
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
GB2023/39A
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.)
General Electric Co PLC
Original Assignee
General Electric Co 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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB2023/39A priority Critical patent/GB525404A/en
Priority to US315484A priority patent/US2211352A/en
Publication of GB525404A publication Critical patent/GB525404A/en
Priority to ES0180670A priority patent/ES180670A1/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
    • H04B1/26—Circuits for superheterodyne receivers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Superheterodyne Receivers (AREA)
  • Particle Accelerators (AREA)

Abstract

525,404. Superheterodyne circuits. GENERAL ELECTRIC CO., Ltd., SIMPSON, A. I. F., and STENNING, L. C. Jan. 20, 1939, Nos. 2032 and 7653. [Class 40 (v)] A short wave superheterodyne receiver in which the local oscillations are obtained through a chain of frequency multipliers, has the last doubler replaced by a second frequency changer so that the required I.F. signal is obtained by a double subtraction from the incoming signal. This arrangement has the advantage that a frequency changer produces slight amplification whereas a frequency doubler does not. The last doubler may feed its output directly to both frequency changers, but as shown in the Fig. the local oscillations applied to the second frequency changer are derived by filtering the output from the first changer. The last doubler may be omitted if the local oscillations applied to the second changer are derived by filtering out from the output of the first the third harmonic of the local oscillations supplied thereto.
GB2023/39A 1939-01-20 1939-01-20 Improvements in electrical superheterodyne frequency-changers Expired GB525404A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB2023/39A GB525404A (en) 1939-01-20 1939-01-20 Improvements in electrical superheterodyne frequency-changers
US315484A US2211352A (en) 1939-01-20 1940-01-25 Superheterodyne frequency changer
ES0180670A ES180670A1 (en) 1939-01-20 1947-11-27 IMPROVEMENTS IN OR RELATED TO CIRCUITS FOR ELECTRONIC DISCHARGE DEVICES THAT USE SECONDARY EMISSION

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2023/39A GB525404A (en) 1939-01-20 1939-01-20 Improvements in electrical superheterodyne frequency-changers

Publications (1)

Publication Number Publication Date
GB525404A true GB525404A (en) 1940-08-28

Family

ID=9732241

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2023/39A Expired GB525404A (en) 1939-01-20 1939-01-20 Improvements in electrical superheterodyne frequency-changers

Country Status (3)

Country Link
US (1) US2211352A (en)
ES (1) ES180670A1 (en)
GB (1) GB525404A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2143691A (en) * 1983-07-22 1985-02-13 Plessey Co Plc A double superhet tuner
GB2192104A (en) * 1986-06-27 1987-12-31 Philips Electronic Associated Superheterodyne radio receiver

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2457137A (en) * 1942-05-22 1948-12-28 Int Standard Electric Corp Ultra high frequency system
US2416791A (en) * 1942-10-10 1947-03-04 Rca Corp Radio receiver system
US2534606A (en) * 1945-08-25 1950-12-19 Kolster Muriel Double superheterodyne radio receiver
US2516272A (en) * 1945-12-07 1950-07-25 Philco Corp Frequency conversion system
US2973478A (en) * 1957-03-29 1961-02-28 Hurvitz Hyman Frequency scanning spectrum analyzers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2143691A (en) * 1983-07-22 1985-02-13 Plessey Co Plc A double superhet tuner
GB2192104A (en) * 1986-06-27 1987-12-31 Philips Electronic Associated Superheterodyne radio receiver

Also Published As

Publication number Publication date
ES180670A1 (en) 1948-01-01
US2211352A (en) 1940-08-13

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