GB235275A - Improvements in or relating to receivers for electrical transmission particularly wireless transmission - Google Patents

Improvements in or relating to receivers for electrical transmission particularly wireless transmission

Info

Publication number
GB235275A
GB235275A GB571924A GB571924A GB235275A GB 235275 A GB235275 A GB 235275A GB 571924 A GB571924 A GB 571924A GB 571924 A GB571924 A GB 571924A GB 235275 A GB235275 A GB 235275A
Authority
GB
United Kingdom
Prior art keywords
tuned
circuits
valve
receivers
relating
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
GB571924A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB571924A priority Critical patent/GB235275A/en
Publication of GB235275A publication Critical patent/GB235275A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/34—Networks for connecting several sources or loads working on different frequencies or frequency bands, to a common load or source
    • H03H11/346—Networks for connecting several sources or loads working on different frequencies or frequency bands, to a common load or source particularly adapted as input circuit for receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/003—Secret communication by varying carrier frequency at or within predetermined or random intervals

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Near-Field Transmission Systems (AREA)

Abstract

235,275. Fulford, W. H. March 6, 1924. Secret and selective systems.-A receiver adapted to secure the con. tinuous reception of messages transmitted either consecutively or simultaneously on two or more different wave-lengths is characterized by the provision in each of the tuned aerial circuits of a small series condenser of approximately 0.00001 mfd. in order to render the tuning of each circuit independent of the other. Two or more circuits 1. 4, 9, tuned to the different frequencies in use, are branched across a common receiving aerial 2 and feed corresponding detector valves 5. The output circuit of each valve 5 comprises a reaction coil 9 and the primary of a low-frequency transformer 10. The secondary of each transformer is connected across the grid and filament of the same amplifying valve 11, which therefore receives a continuous signal in spite of frequency alternations in the transmission designed to confuse an unauthorized listener. One or more amplifying stages 12 may follow the detector valves 5.
GB571924A 1924-03-06 1924-03-06 Improvements in or relating to receivers for electrical transmission particularly wireless transmission Expired GB235275A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB571924A GB235275A (en) 1924-03-06 1924-03-06 Improvements in or relating to receivers for electrical transmission particularly wireless transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB571924A GB235275A (en) 1924-03-06 1924-03-06 Improvements in or relating to receivers for electrical transmission particularly wireless transmission

Publications (1)

Publication Number Publication Date
GB235275A true GB235275A (en) 1925-06-08

Family

ID=9801342

Family Applications (1)

Application Number Title Priority Date Filing Date
GB571924A Expired GB235275A (en) 1924-03-06 1924-03-06 Improvements in or relating to receivers for electrical transmission particularly wireless transmission

Country Status (1)

Country Link
GB (1) GB235275A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2473824A1 (en) * 1980-01-14 1981-07-17 Singer Co METHOD OF SWITCHING BETWEEN RECEIVERS AND CORRELATORS OF A COMMUNICATION SYSTEM AND RECEPTION-CORRELATION APPARATUS FOR IMPLEMENTING SAID METHOD

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2473824A1 (en) * 1980-01-14 1981-07-17 Singer Co METHOD OF SWITCHING BETWEEN RECEIVERS AND CORRELATORS OF A COMMUNICATION SYSTEM AND RECEPTION-CORRELATION APPARATUS FOR IMPLEMENTING SAID METHOD

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