Browse Prior Art Database

PAGING RECEIVER WITH DETECTION SECURITY

IP.com Disclosure Number: IPCOM000005992D
Original Publication Date: 1990-Oct-01
Included in the Prior Art Database: 2001-Nov-22
Document File: 2 page(s) / 61K

Publishing Venue

Motorola

Related People

Randi L. Dulaney: AUTHOR [+2]

Abstract

In facilities where portable communications products (ie: Pagers and Walkie-Talkies) are used, inventoried, and/or manufactured, it is desirable to provide detection of the unauthorized removal of such communications products. Cur- rently, there is no known such security system.

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Technical Developments Volume 11 October 1990

PAGING RECEIVER WITH DETECTION SECURITY

by Randi L. Dulaney and Harry G. Dulaney Ill

   In facilities where portable communications products (ie: Pagers and Walkie-Talkies) are used, inventoried, and/or manufactured, it is desirable to provide detection of the unauthorized removal of such communications products. Cur- rently, there is no known such security system.

   In a first embodiment of the invention (refer to figure l), a low-power transmitter at the exit of the facility repeatedly transmits a signal on the IF frequency of the pagers. The signal is encoded with an address that corresponds to a wm- mon priority override address in each pager. Receipt of this signal by a pager results in generation of a unique audible alert tone in the pager to alert security personnal. Note in this embodiment, the assumption is made that the pager decoder is always powered-up even when the pager switch is turned to the "off" position.

   In a second embodiment of the invention (refer to figure 2) a system similar to those used in department stores is employed. At the exit from the facility, a low-power micrcwave transmitter and receiver are located at opposing sides, The transmitter sends a continuous signal that is received by the receiver. Each pager in the facility contains special material such that when the material travels between the receiver and transmitter the signal is perturbed; this perturba- tion is then detected...