Decatur Electronics Genesis II Select Directional User Manual And Installation Manual

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Decatur Electronics Genesis II Select Directional User Manual And Installation Manual Manual pdf 20 page image

Genesis II Select Directional™ User’s & Installation ManualGenesis II Select Directional™ User’s & Installation Manual3825/Aug/20103925/Aug/20106.2.5 Multi-Beam CancellationThe Genesis II Select Directional is immune to multi-beamcancellation6.2.6 Patrol HarmonicsIn all police radar, when a patrol motor vehicle passes a large,stationary object such as a road sign, building, or overpass, thereturn signal can briefly overload the processing circuitry TheGenesis II Select Directional detects this condition and will notdisplay speeds which are generated by this overloading• Targets traveling at speeds which are close to thepatrol speed can also mimic this condition and willbe rejected The target window will show an “_H_”indicating that it is a patrol harmonic To process thistype of target, simply increase or decrease your patrolspeed by at least 3 km/h6.2.7 Radio Frequency Interference (RFI)The Genesis II Select Directional contains an RFI detection circuitthat detects excess radio frequency energy When stray radiofrequency energy reaches an excessive level, the system displaysthe RFI message and stops processing and displaying speedsThe system resumes normal operation when the RFI condition nolonger exists At that time, any locked speeds will display again6.2.8 ShadowingIn Moving mode, the radar processes two speeds–patrol andtarget The stronger of the two, the patrol speed, is created whenthe radar beam reflects from passing stationary objects, such asthe pavement or terrain the motor vehicle is traveling on However,some situations cause return signals to be larger than the reflectionfrom the ground, such as when the patrol motor vehicle is rapidlyovertaking a slow-moving 18-wheeler Given a choice betweenreading passing ground clutter or the large return signal generatedby the vertical expanse of the truck’s trailer, the radar might ignorethe ground speed and lock onto the stronger return signal Ratherthan receiving a true patrol speed, the radar reads the differentialspeed between the motor vehicle and the 18-wheeler Thecomputer then subtracts this artificially low speed from the closingspeed and assigns a higher speed to the targetThe shadowing error is easy to recognize, because the radarpatrol speed and the speedometer reading will vary significantlyThe target speed in this instance also will vary considerably fromyour visual estimation The correct City/Highway setting helps tominimize this effect• The Genesis II Select Directional recognizes and ignoresshadowing when equiped with the VIP6.2.9 Motor vehicle Ignition InterferenceThe Genesis II Select Directional is designed to operate from themotor vehicle’s cigarette lighter receptacle However, some motorvehicles exhibit excessive alternator noise at the cigarette lighterreceptacle This can be eliminated by wiring direct to the battery7. Field TestsThe following tests are performed to verify the operation andaccuracy of the Genesis II Select Directional7.1 Operator-Requested Self TestPressing the TEST button initiates a comprehensive system self testThe Genesis II Select Directional will not power down during a selftest and checks the following:DISPLAy TEST: Allows the operator to verify that the digit segmentsand status LED lights are working correctly and that none of thepixels in the number segments are burned out