Time-delay relay limits message time of emergency radio-paging system, thereby preventing inadvertent tieup. Relay is connected with telephone circuit and permits adjustable message time between 30 and 55 seconds. After that time interval, relay opens, making line free for another paging regardless of what previous caller did with his telephone.
Preventing radio-paging system tieup
NASA Tech Briefs ; 3 , 1
1978-06-01
Miscellaneous
No indication
English
The concept for world wide radio paging
Automotive engineering | 1991
|Future for mobile radio and paging in europe
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|IuD Bahn | 1995
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