GB371565A - Improvements in wireless signalling systems for controlling tuned electro-mechanical relays - Google Patents

Improvements in wireless signalling systems for controlling tuned electro-mechanical relays

Info

Publication number
GB371565A
GB371565A GB9126/31A GB912631A GB371565A GB 371565 A GB371565 A GB 371565A GB 9126/31 A GB9126/31 A GB 9126/31A GB 912631 A GB912631 A GB 912631A GB 371565 A GB371565 A GB 371565A
Authority
GB
United Kingdom
Prior art keywords
vibrators
circuit
wireless signalling
wave
tuned
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
GB9126/31A
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
Publication of GB371565A publication Critical patent/GB371565A/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
    • H04B1/1638—Special circuits to enhance selectivity of receivers not otherwise provided for

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

371,565. Wireless signalling. RICCHIARDI, P. C., 1, Via Montecuccoli, Turin, Italy. March 25, 1931, No. 9126. Convention date, March 31, 1930. [Class 40 (v).] A number of radio receiving-stations are provided each with a series of tuned mechanical vibrators 13 adapted for selective operation by incoming signals, the incoming wave being first rectified by a detector 3 to bring out a modulation sub-wave in the circuit 4, and the sub-wave being heterodyned by a local oscillator 6. The resulting beat frequency appears in the plate circuit of a second detector 9 and after amplification by the valves 10, 11 acts on the relay 12 and selectively operates one of the vibrators 13; to close a selected circuit. As the local source 6 can be adjusted in frequency, the sets of tuned vibrators 13 may be identical at all the receiving-stations. The vibrators may operate either directly or through further relays to close a selected telephone circuit; or the system may be applied for telegraphic purposes, each signal being constituted by groups of two or more frequencies as in Specification 276,376, [Class 40 (v), Wireless signalling &c.].
GB9126/31A 1930-03-31 1931-03-25 Improvements in wireless signalling systems for controlling tuned electro-mechanical relays Expired GB371565A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT371565X 1930-03-31

Publications (1)

Publication Number Publication Date
GB371565A true GB371565A (en) 1932-04-28

Family

ID=11245874

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9126/31A Expired GB371565A (en) 1930-03-31 1931-03-25 Improvements in wireless signalling systems for controlling tuned electro-mechanical relays

Country Status (1)

Country Link
GB (1) GB371565A (en)

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