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GB1176460A - Pocket Receiver for Private Calling Systems - Google Patents

Pocket Receiver for Private Calling Systems

Info

Publication number
GB1176460A
GB1176460A GB4220968A GB4220968A GB1176460A GB 1176460 A GB1176460 A GB 1176460A GB 4220968 A GB4220968 A GB 4220968A GB 4220968 A GB4220968 A GB 4220968A GB 1176460 A GB1176460 A GB 1176460A
Authority
GB
United Kingdom
Prior art keywords
receiver
pocket
transistor
battery
clip
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
GB4220968A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1176460A publication Critical patent/GB1176460A/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
    • H04B1/1607—Supply circuits
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
    • G08B3/1008—Personal calling arrangements or devices, i.e. paging systems
    • G08B3/1016—Personal calling arrangements or devices, i.e. paging systems using wireless transmission
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/52—Circuit arrangements for protecting such amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/04—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Electrotherapy Devices (AREA)

Abstract

1,176,460. Inductive signalling; radio receivirig apparatus. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 5 Sept., 1968 [8 Sept., 1967], No. 42209/68. Headings H4L, H3Q and H4U. A pocket receiver for a paging system is provided with a transistor switch, operated by contacts on a spring clip for holding the receiver in a pocket, which automatically switches off the receiver when it is removed from the pocket. The battery supply terminal 3 of the receiver 1 is connected via the emitter-collector path of a transistor 6 to the battery 5, the terminal 4 being connected direct to the battery. The base of the transistor is connected to the positive terminal of the battery through a resistor 7 so that the transistor is conductive when a switch 8 is open. When the receiver is removed from the pocket switch 8 formed by the spring clip is closed and transistor 6 is made non-conducting. A spring-loaded insulating plate may be arranged on the housing of the receiver so that it can be moved between the clip contacts to put the receiver into operation, the plate being displaced automatically from the contacts when the clip is clamped on a pocket.
GB4220968A 1967-09-08 1968-09-05 Pocket Receiver for Private Calling Systems Expired GB1176460A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6712328A NL6712328A (en) 1967-09-08 1967-09-08

Publications (1)

Publication Number Publication Date
GB1176460A true GB1176460A (en) 1970-01-01

Family

ID=19801156

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4220968A Expired GB1176460A (en) 1967-09-08 1968-09-05 Pocket Receiver for Private Calling Systems

Country Status (4)

Country Link
DE (1) DE1766984B2 (en)
FR (1) FR1582994A (en)
GB (1) GB1176460A (en)
NL (1) NL6712328A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4906972A (en) * 1987-04-29 1990-03-06 The Boeing Company Communication system for hazardous areas

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3412315C1 (en) * 1984-04-03 1985-08-14 ANT Nachrichtentechnik GmbH, 7150 Backnang Lighting device for electro-optical display device in a pocket device
DE4127207A1 (en) * 1991-08-19 1993-02-25 Kolbus Gmbh & Co Kg DEVICE FOR TRANSFERING BOOKS OR THE LIKE PRODUCTS FROM A STANDING POSITION TO A LYING POSITION

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4906972A (en) * 1987-04-29 1990-03-06 The Boeing Company Communication system for hazardous areas

Also Published As

Publication number Publication date
DE1766984A1 (en) 1971-09-23
DE1766984B2 (en) 1975-09-04
NL6712328A (en) 1969-03-11
FR1582994A (en) 1969-10-10

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