Antenna switching for amplitude degradation during supervision a

Communications: electrical – Condition responsive indicating system – With particular coupling link

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340506, 340514, G08B 108

Patent

active

060879335

ABSTRACT:
A method for testing the signal margin of an alarm system during installation of the alarm system and during the alarm system supervision time. The alarm system comprises a plurality of remote transmitting devices and a receiver/control unit. The receiver/control unit comprises a receiver with at least one antenna apparatus and processing apparatus for processing messages received from each of the remote devices. Both the install mode and the supervision mode cause the receiver/control unit to receive signals at a lower level than normal by selecting an associated antenna configuration. When entering the installation mode, the processor switches the antenna apparatus to a "no antenna" state, and when entering the supervision mode, the processor switches two or more antenna apparatus to an "on" state.

REFERENCES:
patent: 4656364 (1987-04-01), Yokogawa
patent: 5465411 (1995-11-01), Koike
patent: 5648992 (1997-07-01), Wright et al.
patent: 5661762 (1997-08-01), Petranovich
patent: 5699054 (1997-12-01), Duckworth
patent: 5761613 (1998-06-01), Saunders et al.

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