User's Manual

SECTION 8—INFLUENCES AND INTERFERENCE
8.2
8.1 MAN-MADE INFLUENCES
1. Radar units may display incorrect speed readings from
various sources. These include shadowing, combined
speeds, moving cosine and fan interferences (splitting
speeds).
2. Patrol speed shadowing may occur when the radar unit
receives a stronger reflected signal from a vehicle
traveling the same direction than the groundspeed
return signal of the patrol vehicle. This difference
speed may be placed in the Patrol area and used instead
of the proper patrol speed. See Sec. 8.2.
3. The combined speed effect can occur when the patrol
vehicle and the target vehicle are approaching each
other at low speeds, usually in the 25 to 35 mph (40 to
56 km/h) range each, and at relative short distances,
usually less than 300 feet. The radar unit sees a strong
reflection from the combined speed signal and may
display this speed instead of the true patrol speed.
NOTE: The Raptor RP-1 with speedometer input will
eliminate these shadowing and combining
effects, and display the proper patrol and
target speeds. If the speedometer input is not
used, the Raptor RP-1 has patented software
algorithms that allow the radar to correct
shadowing or combined readings. If the user
suspects that the radar is displaying a shadow
or combined speed, entering and exiting the
Hold Mode quickly should correct the readings.
4. The Raptor RP-1 has an input power monitor. If the
power supply voltage drops below the minimum
operating voltage, the unit will not display any new
speed-readings until the low voltage condition no
longer exists. "LOW VOLTAGE" will be displayed in
the Message area.