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Models SDI-76MW and SDI-77MW are indoor microwave intrusion sensors designed for applications where the very
highest level of security is required. As in all PROTECH intrusion sensors, Models SDI-76MW and SDI-77MW utilize
PROTECH’s proprietary “Stereo Doppler” Microwave technology.
STEREO DOPPLER TECHNOLOGY
In 1980, a technological breakthrough in microwave signal processing termed “Stereo Doppler” was developed. This
technology became the basis for PROTECH’s high security military sensor designs. Unlike conventional microwave
sensors, PROTECH sensors can actually determine the exact distance in inches (centimeters) that a target must move to
create a valid alarm signal. In addition, sensors equipped with Stereo Doppler technology can ignore vibration and
randomly moving objects (swinging signs, overhead doors, moving displays, etc.) as potential sources of nuisance alarms.
The benefit is a higher level of security without the nuisance alarms. Models SDI-76MW and SDI-77MW are typically
used in military and government installations.
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