GB1306816A - Selective call transmitters - Google Patents
Selective call transmittersInfo
- 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
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.
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) |
-
1969
- 1969-03-21 DE DE19691914454 patent/DE1914454A1/en active Pending
- 1969-12-19 FR FR6944251A patent/FR2033702A5/fr not_active Expired
-
1970
- 1970-03-23 GB GB1387170A patent/GB1306816A/en not_active Expired
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 |