Download Stalker Speed Sensor User Guide - Mega-Tech

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“100MPH(0x0D)”
Units and Carriage Return / Line Feed – Each message is terminated with the
speed’s unit of measure followed by a carriage return and then a line feed.
“100MPH(0x0D,0x0A)”
3. Speed Presentation
SETTING
Auto-Clear Delay
Cosine Angle 1
Cosine Angle 2
ID
88
18
19
The internal measurements made by the radar are modified and presented to the user
depending on the settings in this section.
The Auto-Clear Delay setting (88) defines the time that the speed reading is held after
the target is lost and before the display screen clears. The default is 2 seconds. If set
for OFF, the last speed displayed never clears and stays on the screen until the next
speed is acquired.
Angle Errors
The most common mistake made with radar guns is trying to clock targets at angles.
The Speed Sensor measures the most accurate speeds when targets are moving
directly toward or away from it. As with any radar, aiming at an angle results in angle
error, and the radar reports a speed that is LOWER than the actual speed. At slight
angles the error is very small; however at larger angles the error can become
substantial. In the diagram below, a radar located in the alternate placement will report
a lower speed than one placed in the ideal placement.
These low speeds can be corrected using the Cosine Angle settings (18 and 19). They
can be set in one degree increments in the range from 0 to 45 degrees, and the default
for both is 0 degrees. The accuracy of the corrected speed is directly dependent on the
accuracy of the estimated angle that is set.
Radar Gun Placement
C-6