Whistler GT-138Xi User Manual page 15

OPERATION
Field Disturbance Sensor Rejection (FDSR)
Traffic Flow Sensor Rejection (TFSR)
Recently many new products that operate on police radar
frequencies have been causing nuisance alerts to radar detectors.
These radar based sensors are installed alongside the Highway
and more recently on vehicles used as lane change assist / blind
spot detectors / collision avoidance systems. TFSR is designed
to eliminate alerts from specific Traffic Flow sensors. FDSR is
designed to identify all radar based collision avoidance systems
that operate within the same band as police radar and provide a
brief less intrusive alert to keep you informed and aware.
A signal strength indicator will help determine your proximity to
the source without the continued annoyance of audio.
NOTE: TFSR and FDSR are ON by default and not selectable on
the GT-138Xi
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