Description:

Acoustic-Magnetic EAS systems transmit a magnetic frequency signal at a frequency of 58 kHz in a pulsed pattern. The transmitted signal is then used to energize an acoustic-magnetic retail security tag or label that is within the systems detection zone or field. While the transmitted signal is switched off between pulses, a narrow band receiver circuit within the electronics pack of the system then detects the retail security tag or label signal.

A microcomputer within the system is then used to check the retail security tag or label signal that has been detected by the receiver, to ensure the following:

• The signal is radiated at the right frequency and has defined characteristics.

• The signal occurs at a precise point in time, which is also synchronized to

the transmitter.

• The signal has been received at the proper level, and at the correct repetition

or pulse rate.