Applied Concepts Inc ACMI006 Manuale Utente

17 

A variety of sources, both natural and man-made, can cause misleading indications or poor performance.  The operator 
should note the symptoms described below, and take steps to avoid the problem, or ignore the misleading indications. 

Radar signals will not pass through most solid objects, including tree foliage.  Make certain the path between the radar and 
target vehicle is unobstructed.  A glass window is a partial reflector of radar; therefore, some reduction in range will be 
experienced when aiming through patrol vehicle windows.  

Rain absorbs and scatters the radar signal.  This reduces the range and increases the possibility of obtaining readings from 
the speed of the raindrops. 

Electrical noise sources include neon signs, radio transmitters, power lines, and transformers.  These influences may cause 
reduced range or intermittent readings. When these interferences are present, the RFI indicator should come on and 
suppress all readings. 

An extremely noisy vehicle electrical system may cause erratic operation.  If this condition occurs, it is recommended that a 
two conductor shielded cable be run directly from the vehicle battery to the cigarette lighter plug on the dash.  This should 
eliminate any problems from vehicle electrical noise. 

As you will discover, the S 

that you have purchased is extremely sensitive resulting in longer range.  This 

extra sensitivity may allow you to pick up fan noise when operating the radar from inside the patrol vehicle. 

Fan noise is a common Doppler radar problem when aiming the antenna through a window from inside the patrol vehicle.  
A small amount of the radar beam is reflected off the glass back into the vehicle.  This may allow the radar to pick up fan 
noise from within the patrol vehicle. 

The problem is not a problem with the radar, but with the location of the radar's antenna.  Doppler radar is designed to 
detect moving or vibrating objects; therefore, it may detect any moving or vibrating surfaces inside the patrol vehicle, such 
as the fan or a dashboard that is vibrating from the fan.  Fan interference can be verified by turning off or changing the 
speed of the fan. 

Most fans generate speeds of 30 mph or less.  As a result, fan noise is normally only a problem when operating in 
stationary mode or when operating in moving mode with patrol speeds less than 30 mph.  

1.  Find a location (by moving the antenna) inside the vehicle that is free of fan noise; such as a corner of the dash away 

from the fan. The lower left side of the dash is a recommended location. 

2.  Insure that the antenna beam is not deflected back into the vehicle by anything in its path such as wipers, window trim, 

or anything mounted on the dash.  Do not mount the counting/display unit or antenna/power cables in front of the 
antenna on the dash. 

3.  Locate the antenna as close to the inside glass as possible (preferably less than 1/2 inch). 

4.  Turn the fan off while operating the radar in stationary mode or moving mode with patrol speed under 30 mph. 

5.  Install an optional Antenna Port on the glass surfaces directly in front of the antenna.   The specially designed Antenna 

Port consists of two white discs, 3 1/2 inches in diameter, with double-sided tape on one side.  Attach one disc on the 
inside glass surface, and the other disc on the outside glass surface.  Due to interference with windshield wipers, the 
Antenna Port can only be installed on the rear window. 

6.  If the above suggestions fail, mount the antenna completely outside the vehicle.