Decatur Electronics GHD User Manual

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Decatur Electronics GHD User Manual Manual pdf 28 page image

GHDTM& SCOUTTMUSER’S MANUAL267.6 Feedback InterferenceWhen the radar beam is directed at computer screens, streetlights,and other electronic devices, it can display spurious speeds. Tocorrect the interference, relocate the radar gun antenna.7.7 Multi-Path Beam CancellationIf multi-path beam cancellation occurs, the target vehicle speedsporadically blinks and reappears at semi-random intervals. Thistype of interference occurs when the radar loses track of a targetvehicle because the target is reflecting two or more signals, which areinterfering with each other. The GHD and the SCOUT are immunefrom multi-path cancellation.7.8 Radio Frequency Interference (RFI)The system can inadvertently process radio energy as Dopplerspeeds, including that from police radios, airport radar, microwavetransmission towers, CB radio transmitters, and AM/FM transmissiontowers. For this type of interference to occur, the radar gun must beoperating very close to the radio transmitter.The GHD and SCOUT radars contain an RFI detection circuit thatdetects excess radio frequency energy. When stray radio frequencyenergy reaches an excessive level, the system displays an RFImessage and stops processing and displaying speeds. The systemresumes normal operation when the RFI condition no longer exists.At that time, any locked speeds will display again.7.9 ScanningThe GHD and SCOUT are designed to be used while attached to asolid mount or hand-held in a steady position. Moving or “scanning”the antenna past stationary objects can cause the system to detectmotion. Obtaining a speed reading from scanning will not happenwhen you properly use the radar and is considered deliberate misuseof the system.