Communications: electrical – Systems – Call station
Patent
1972-12-18
1976-06-01
Swann, III, Glen R.
Communications: electrical
Systems
Call station
340 65, 343712, 340224, G08B 1302
Patent
active
039613232
ABSTRACT:
A container monitoring system has a small transmitter unit adapted for easy attachment to and removal from a container such as a truck, trailer or railroad car when not in motion and a receiver which alerts a guard as to a theft-related movement either of the container itself or motion into or out of the container, or to a condition within the container such as temperature. The apparatus has provision for transmitting a low power, radio frequency carrier signal, preferably 27 MHz with a wire loop which is mounted to utilize the metallic body of the container as part of the antenna radiation system. The carrier is modulated with a mid-frequency signal that is interrupted at a precisely controlled low frequency rate and has a signal duration of a predetermined different inerval as measured from the theft-related movement. The coding, including the analysis of the signal at the receiver, minimizes false alarms from non-system transmissions on the same carrier frequency and with the same mid-frequency modulation, and permits detection of intentional jamming of the receiver as well as other forms of sabotage to the surveillance system.
REFERENCES:
patent: 3167755 (1965-01-01), Larrick et al.
patent: 3257653 (1966-06-01), McCorkindale
patent: 3478344 (1969-11-01), Schwitzgebel et al.
patent: 3559194 (1971-01-01), Bisberg
patent: 3597753 (1971-08-01), Tabankin
patent: 3618059 (1971-11-01), Allen
patent: 3618083 (1971-11-01), Burley et al.
American Multi-Lert Corporation
Swann III Glen R.
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