GB1306816A - Selective call transmitters - Google Patents

Selective call transmitters

Info

Publication number
GB1306816A
GB1306816A GB1387170A GB1387170A GB1306816A GB 1306816 A GB1306816 A GB 1306816A GB 1387170 A GB1387170 A GB 1387170A GB 1387170 A GB1387170 A GB 1387170A GB 1306816 A GB1306816 A GB 1306816A
Authority
GB
United Kingdom
Prior art keywords
signal
tone
signals
determined
disable
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
GB1387170A
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.)
Robert Bosch Elektronik GmbH
Original Assignee
Robert Bosch Elektronik GmbH
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 Robert Bosch Elektronik GmbH filed Critical Robert Bosch Elektronik GmbH
Publication of GB1306816A publication Critical patent/GB1306816A/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
    • H04W88/18—Service support devices; Network management devices
    • H04W88/185—Selective call encoders for paging networks, e.g. paging centre devices
    • H04W88/188—Selective call encoders for paging networks, e.g. paging centre devices using frequency address codes

Landscapes

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

Abstract

1306816 Radio signalling ROBERT BOSCH ELEKTRONIK GmbH 23 March 1970 [21 March 1969] 13871/70 Heading H4L A selective call transmitter for radio-telephones in which an oscillator has two tuned circuits at different audio frequencies alternately switched into operation to provide a two-tone calling signal, comprises a counter circuit operative to disable the switch after a predetermined number of transmitted calling signals. As shown operation of call button 11 applies a signal to bi-stable circuit 17 to enable over 15 an astable multivibrator 19 and to switch an audio oscillator 6. The audio signal comprises two tones, the first being determined by tap 9 of inductor 7 when 23 is conductive, and the second tone by tap 10 when multivibrator 19 switches to make 24 conductive; 19 then switches back and 16 is switched off to disable 19 and 6, and a two state counter 25 is advanced to 1 whereby after a delay determined by 29 a signal over 31 repeats the operation, advancing 25 to 0. Thus only two two-tone signals are transmitted, with an interval determined by 29. Modifications enabling up to five signals to be generated are described and illustrated.
GB1387170A 1969-03-21 1970-03-23 Selective call transmitters Expired GB1306816A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691914454 DE1914454A1 (en) 1969-03-21 1969-03-21 Selective caller

Publications (1)

Publication Number Publication Date
GB1306816A true GB1306816A (en) 1973-02-14

Family

ID=5728886

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1387170A Expired GB1306816A (en) 1969-03-21 1970-03-23 Selective call transmitters

Country Status (3)

Country Link
DE (1) DE1914454A1 (en)
FR (1) FR2033702A5 (en)
GB (1) GB1306816A (en)

Also Published As

Publication number Publication date
FR2033702A5 (en) 1970-12-04
DE1914454A1 (en) 1970-10-01

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees