GB667188A - Improvements in or relating to radio-controlled remote selecting systems - Google Patents

Improvements in or relating to radio-controlled remote selecting systems

Info

Publication number
GB667188A
GB667188A GB8973/49A GB897349A GB667188A GB 667188 A GB667188 A GB 667188A GB 8973/49 A GB8973/49 A GB 8973/49A GB 897349 A GB897349 A GB 897349A GB 667188 A GB667188 A GB 667188A
Authority
GB
United Kingdom
Prior art keywords
relay
relays
amplifier
carrier
circuit
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
GB8973/49A
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.)
DET STORE NORDISKE TELEGRAF SE
Original Assignee
DET STORE NORDISKE TELEGRAF SE
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 DET STORE NORDISKE TELEGRAF SE filed Critical DET STORE NORDISKE TELEGRAF SE
Publication of GB667188A publication Critical patent/GB667188A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/022—Selective call receivers
    • H04W88/025—Selective call decoders
    • H04W88/027—Selective call decoders using frequency address codes

Landscapes

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

Abstract

667,188. Electric selective signalling systems. STORE NORDISKE TELEGRAFSELSKAE AKTIESELSKAB. April 1, 1949. [April 2, 1948] No. 8973/49. Drawing to Specification. Class 40 (i). [Also in Group XL (c)] In a radio remote control system employing a carrier modulated by different low, e.g. audio, frequencies, the receiver comprises a chain of two or more relays 20 each controlled by a separate amplifier 18 responsive to one only of the frequencies and each relay has a holding circuit 22 connected over a contact 25 of any preceding relay, a control, e.g. alarm, circuit 32, 34 being closed when all contacts 30 of the relays have been connected up. If 10 modulation frequencies and three relays at called stations are used one of any 1,000 stations may be called. The amplifiers and relays being connected in parallel, operation of more than one relay each responsive to the same frequency at a station is avoided by making the duration of a call frequency less than twice, e.g. one and half times, the time delay of operation of an amplifier and relay, each amplifier screen grid circuit being connected up over a contact on any preceding relay. A further amplifier and relay responsive to a further tone may be arranged to call all the stations simultaneously. A frequency-modulated carrier may be used, and a squelch circuit, operated by the difference between rectified voltages derived from noise signals after the discriminator and from the carrier wave at the limiter, which operates a relay opening all the chain relay holding circuits if the carrier does not sufficiently exceed the noise level.
GB8973/49A 1948-04-02 1949-04-01 Improvements in or relating to radio-controlled remote selecting systems Expired GB667188A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK667188X 1948-04-02

Publications (1)

Publication Number Publication Date
GB667188A true GB667188A (en) 1952-02-27

Family

ID=8152123

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8973/49A Expired GB667188A (en) 1948-04-02 1949-04-01 Improvements in or relating to radio-controlled remote selecting systems

Country Status (1)

Country Link
GB (1) GB667188A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3001177A (en) * 1958-04-07 1961-09-19 Zenith Radio Corp Superregenerative remote control receiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3001177A (en) * 1958-04-07 1961-09-19 Zenith Radio Corp Superregenerative remote control receiver

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