RAILMASTER-VP™ USER’S MANUAL
18
The following table shows the effect that an
increasing angle has on a displayed speed.
Horizontal angle degrees:
0° 1°
3° 5°
10°
15° 20° 30° 45° 60° 90°
Actual
speed:
Displayed speeds:
30 mph
30 29 29 29 29
28 28 26 21 15 0
40 mph
40 39 39 39 39
38 37 34 28 20 0
50 mph
50 49 49 49 49
48 46 43 35 25 0
60 mph
60 59 59 59 59
57 56 51 31 30 0
70 mph
70 69 69 69 68
67 65 60 49 35 0
80 mph
80 79 79 79 78
77 75 69 57 40 0
Table 5.2.1 Actual and displayed speeds at different
antenna-to-target angles
Small angles (less than 10°) have little effect on
accuracy. As the angle increases, the displayed
speed decreases. At 90°, the target speed is 0
mph—grossly incorrect.
5.2.2 Electromagnetic Interference (EMI)
Operating motors can produce EMI. EMI from
power seats or windshield wipers can also
produce spurious target speeds. To correct this
type of interference, simply turn off its source.
5.2.3 Feedback Interference
When you direct the radar beam at laptop
computer screens, streetlights, and other
electronic devices, the radar gun can display
spurious speeds. To correct this type of
interference, relocate the radar antenna.
