User Manual

40
All radar speed measurement devices are sensitive to objects that move or vibrate in front
of the antenna. In instances where the antenna is pointed in the general direction of the
fan, or where the radar beam is reflected by the glass towards the heater/defroster fan,
the radar may read the speed of the fan. Reading the fan speed is annoying and, in some
cases, can reduce the effective range of the speed measurement device.
MPH Industries suggests the following if fan interference is suspected:
1. First, determine the fan is the source of interference by checking whether
the readings change when the fan is turned off or when the fan speed is
increased or decreased.
2. Reduce the effects of the fan by locating the BEE III in an area that is
less susceptible to the fan motion. MPH Industries provides several
mounting options. In some cases, the left-hand corner of the dash has
been found to be the best mounting location. Alternately, the antenna
may be mounted outside of the patrol vehicle.