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6.2.5 Multi-Beam Cancellation
The Genesis II Select Directional is immune to multi-beam
cancellation .
6.2.6 Patrol Harmonics
In all police radar, when a patrol motor vehicle passes a large,
stationary object such as a road sign, building, or overpass, the
return signal can briefly overload the processing circuitry . The
Genesis II Select Directional detects this condition and will not
display speeds which are generated by this overloading .
• Targets traveling at speeds which are close to the
patrol speed can also mimic this condition and will
be rejected . The target window will show an "_H_"
indicating that it is a patrol harmonic . To process this
type of target, simply increase or decrease your patrol
speed by at least 3 km/h .
6.2.7 Radio Frequency Interference (RFI)
The Genesis II Select Directional contains an RFI detection circuit
that detects excess radio frequency energy . When stray radio
frequency energy reaches an excessive level, the system displays
the RFI message and stops processing and displaying speeds .
The system resumes normal operation when the RFI condition no
longer exists . At that time, any locked speeds will display again .
6.2.8 Shadowing
In Moving mode, the radar processes two speeds–patrol and
target . The stronger of the two, the patrol speed, is created when
the radar beam reflects from passing stationary objects, such as
the pavement or terrain the motor vehicle is traveling on . However,
some situations cause return signals to be larger than the reflection
from the ground, such as when the patrol motor vehicle is rapidly
overtaking a slow-moving 18-wheeler . Given a choice between
reading passing ground clutter or the large return signal generated
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7. Field Tests
The following tests are performed to verify the operation and
accuracy of the Genesis II Select Directional .
7.1 Operator-Requested Self Test
Pressing the TEST button initiates a comprehensive system self test .
The Genesis II Select Directional will not power down during a self
test and checks the following:
DISPLAy TEST: Allows the operator to verify that the digit segments
and status LED lights are working correctly and that none of the
pixels in the number segments are burned out .
25/Aug/2010
by the vertical expanse of the truck's trailer, the radar might ignore
the ground speed and lock onto the stronger return signal . Rather
than receiving a true patrol speed, the radar reads the differential
speed between the motor vehicle and the 18-wheeler . The
computer then subtracts this artificially low speed from the closing
speed and assigns a higher speed to the target .
The shadowing error is easy to recognize, because the radar
patrol speed and the speedometer reading will vary significantly .
The target speed in this instance also will vary considerably from
your visual estimation . The correct City/Highway setting helps to
minimize this effect .
• The Genesis II Select Directional recognizes and ignores
shadowing when equiped with the VIP .
6.2.9 Motor vehicle Ignition Interference
The Genesis II Select Directional is designed to operate from the
motor vehicle's cigarette lighter receptacle . However, some motor
vehicles exhibit excessive alternator noise at the cigarette lighter
receptacle . This can be eliminated by wiring direct to the battery .
25/Aug/2010
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