Alarm Sounds When RF Transmitter is Out of Range

Abstract: This design idea explains how a 915MHz receiver can sound an alarm when a transmitter moves beyond a predetermined boundary.
Maxim > Design Support > App Notes > Amplifier and Comparator Circuits > APP 5099
Maxim > Design Support > App Notes > Oscillators/Delay Lines/Timers/Counters > APP 5099
Maxim > Design Support > App Notes > Wireless and RF > APP 5099

Keywords: transmitter, RF, receiver, alarm, RF perimeter

Aug 02, 2011
APPLICATION NOTE 5099
Alarm Sounds When RF Transmitter is Out of Range
By: Tom Au-Yeung
Craig Sakamoto

Abstract: This design idea explains how a 915MHz receiver can sound an alarm when a transmitter moves beyond a predetermined
boundary.

A similar version of this design idea appeared in the December 12, 2010 issue of EDN .

The receiver circuit of Figure