Beltronics Radar Detector Sti r Plus User Manual

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How Radar Works
Traffic radar, which consists of
microwaves, travels in straight
lines and is easily reflected by
objects such as cars, trucks, even
guardrails and overpasses. Radar
works by directing its microwave
beam down the road. As your vehicle
travels into range, the microwave beam
bounces off your car, and the radar
antenna looks for the reflections.
Using the Doppler Principle, the radar
equipment then calculates your speed by
comparing the frequency of the reflection
of your car to the original frequency of the
beam sent out.
Traffic radar has limitations, the most
significant of these being that it typically
can monitor only one target at a time. If
there is more than one vehicle within
range, it is up to the radar operator to
decide which target is producing the
strongest reflection. Since the strength of
the reflection is affected by both the size
of the vehicle and its proximity to the
antenna, it is difficult for the radar
operator to determine if the signal is from
a sports car nearby or a semi-truck several
hundred feet away.
Radar range also depends on the
power of the radar equipment itself.
The strength of the radar unit’s beam
diminishes with distance. The farther the
radar has to travel, the less energy it has
for speed detection.
Because intrusion alarms and motion
sensors often operate on the same
frequency as X, and K-band radar, your
STiR Plus will occasionally receive non-
police radar signals. Since these X-Band
transmitters are usually contained inside
of a building, or aimed toward the ground,
they will generally produce much weaker
readings than will a true radar encounter.
As you become familiar with the sources
of these pseudo alarms in your daily
driving, they will serve as confirmation
that your STiR Plus’s radar detection
abilities are fully operational.
How TSR Works
Your radar detector includes a new
optional boost in anti-falsing software to
eliminate excessive alerts from erroneous
X and K-band sources. One example of
this is traffic flow monitoring systems.
These systems, which are becoming more
widely used in several countries, generate
K-band signals to measure the flow of
traffic on a given road. Unfortunately most
detectors see this as a real threat and will
alert you to it unnecessarily. Our new
proprietary software (TSR), intelligently
sorts, ranks and rejects this type of false
alarm automatically. The result is ultimate
protection without excessive false alarms.
The TSR software is set up as an
option and can be activated through the
Programming section. We suggest you
turn TSR on if you are experiencing
How Radar Works How POP Works How Laser Works
extreme false alerts in your area. If not,
your detector is ready to start protecting
you right out of the box.
If you have any questions about this
new feature, please give us a call or visit
our website for more details.
How “POP” Works
“POP” mode is a relatively new feature for
radar gun manufacturers. It works by
transmitting an extremely short burst,
within the allocated band, to identify
speeding vehicles in traffic. Once the
target is identified, or “POPPED,” the gun
is then turned to its normal operating
mode to provide a vehicle tracking history,
(required by law).
NOTE: According to the operator’s
manual from the radar gun
manufacturer, tickets should not be
issued in POP mode.
How Laser (Lidar) Works
Laser speed detection is actually
LIDAR (Light Detection and
Ranging). LIDAR guns project a
beam of invisible infrared light. The
signal is a series of very short infrared
light energy pulses which move in a
straight line, reflecting off your car
and returning to the gun. LIDAR uses
these light pulses to measure the distance
to a vehicle. Speed is then calculated by
measuring how quickly these pulses are
reflected given the known speed of light.
LIDAR (or laser) is a newer technology
and is not as widespread as conventional
radar, therefore, you may not encounter
laser on a daily basis. And unlike radar
detection, laser detection is not prone to
false alarms. Because LIDAR transmits a
much narrower beam than does radar, it is
much more accurate in its ability to
distinguish between targets and is also
more difficult to detect. As a result, even
the briefest laser alert should be
taken seriously.
There are limitations to LIDAR
equipment. LIDAR is much more sensitive
to weather conditions than RADAR, and a
LIDAR gun’s range will be decreased by
anything affecting visibility such as rain,
fog, or smoke. A LIDAR gun cannot
operate through glass and it must be
stationary in order to get an accurate
reading. Because LIDAR must have a clear
line of sight and is subject to cosine error
(an inaccuracy, which increases as the
angle between the gun and the vehicle,
increases) police typically use LIDAR
equipment parallel to the road or from an
overpass. LIDAR can be used day or night.
How TSR Works

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