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Triggering alarm when RF transmitter is out of range

Posted: 30 Sep 2011 ?? ?Print Version ?Bookmark and Share

Keywords:915MHz receiver? alarm? transmitter?

Here's a design idea explaining how a 915MHz receiver can sound an alarm when a transmitter moves beyond a predetermined boundary.

The receiver circuit illustrated in this application note sounds an audio alarm when the MAX2623 transmitter moves beyond a designated perimeter. The trigger distance depends on conditions and antenna design. In tests in a home environment with simple wire antennas, the distance was about five feet (1.5m).

View the PDF document for more information.

Originally published by Maxim Integrated Products at as "Alarm Sounds When RF Transmitter is Out of Range".

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