Uniden LRD 757, LRD 747 User Manual

OF YOUR REFERENCE GUIDE

CONTENTS

Introduction .................................2

Feature Highlights ...............................2

Included with Your Radar Detector ..................3

Speed Detection ..............................4

Speed Detection Systems ..........................4

Radar .........................................4

Laser .........................................5

Controls.....................................6

Controls and Functions ...........................6

LED Panel......................................7

Installation ..................................8

Helpful Tips ....................................9

Adjusting the Windshield Mounting Clip .............10

Connecting the Power ...........................11

Replacing the Fuse ..............................12

Operation ..................................13

Power On.....................................13

Volume Control ................................13

Memory Retention Feature........................14

Full Warning ..................................14

Audio Alert Only Operation .......................14

Visual Alert Operation ...........................15

Auto Mute Operation .......................15

City Operation .................................16

LED Signal Strength Meter in City Mode .............17

Safety Warning System Operation ..................17

Care and Maintenance ...........................18

Troubleshooting .............................19

Specifications ...............................20

NOTE: Foldout the
back cover of this
reference guide to
refer to the “Controls

CONTENTS

& Functions” page.

1

INTRODUCTION

Welcome to the world of sophisticated, early warning laser/radar
detection. You have purchased one of the most advanced
laser/radar detectors available. The LRD 747/LRD 757 is a
completely integrated laser/radar detector. It responds to the X-,
K-, and Ka-SuperWideband radar guns in use today and also
provides 360° detection of the latest speed monitoring system —
the laser gun. The built-in Safety Warning System (SWS™) is
capable of detecting a hazardous warning signal transmitted on
the K-band.

The LRD 747/LRD 757 provides distinct visual and audio alerts to
warn you of the presence of X-, K-, and Ka-SuperWideband radar
signals as well as IR laser signals. You can drive with confidence
when you bring along the LRD 747/LRD 757.

The LRD 747/LRD 757 employs Super Stalker Technology (SST), a
state-of-the-art electronic system designed to make this radar
detector invisible to all current VG-2 radar detector detectors. The
LRD 747/LRD 757 also uses the new D.R.O. (Dielectric Resonant
Oscillator) and E.D.I.T.
(Electronic Data Interference Terminator) circuitry, giving
more reliable performance.

We are certain that you will enjoy the LRD 747/LRD 757, and to
ensure that you get the most from its features, please read this
Reference Guide carefully before installing and operating the unit.

TO YOUR NEW LASER/RADAR DETECTOR

FEATURE HIGHLIGHTS

•

360° Laser Detection

•

Safety Warning System™

•

All Band Coverage

•

7 Alarm Tones

•

Super Wideband

•

VG-2 Undetectable

•

K/Ka Priority

•

Pulse Detection

INTRODUCTION

•

Signal Strength Meter

•

Warning Lights

•

Visual Only Mode

•

Auto Mute Mode

•

Audio Only Mode

•

Self Test

•

Memory Retention Feature

•

City and Highway Modes

2

To get the most from
your laser/radar
detector, please read
this Reference
Guide thoroughly.

INCLUDED WITH YOUR RADAR DETECTOR

Reference Guide

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Windshield Clip

INTRODUCTION

WARNING

If any of these items
are missing or damaged,
contact your dealer
immediately. Be sure
to complete and mail
the product registration
card. Included with
your radar detector.

Printed Material

Straight Power Cord

LRD 747 Only

3

Fuses and Spare Parts

Coiled Cigarette Adapter

LRD 757 Only

SPEED DETECTION SYSTEMS

A speed detection device (often called a radar gun) sends out
either a microwave signal or beam of light. When this signal
reaches its target, part of the signal is reflected or bounced back
toward the emitting gun. The time required for the signal to leave
the gun, bounce off an object, and return is used to determine a
vehicle’s distance and speed.

RADAR

▼

Radar (Radio Detection and Ranging) is a microwave system for
detecting the speed of moving objects by reflected pulses of high
frequency radio waves. There are three radar bands
(microwave frequencies): X band (10.49 to 10.56GHz), K band
(24.04 to 24.26GHz), and the “superwide” Ka band (33.4 GHz to
36 GHz).

The X band was the first used for traffic, followed by the K band
which is harder to detect (most instant-on radar is K band). The
Ka band was introduced in 1987, and widened to Ka SuperWideband
in 1990 by the FCC. The LRD 747/LRD 757 monitors all current
radar bands including the entire Ka SuperWideband.

The radar beam is cone shaped — the narrower the beam, the
greater the resolution. A moving vehicle reflects radar signals
back towards the radar gun. The LRD 747/LRD 757 can detect the
signals emitted by radar guns, and it will sound an audio alarm
and flash a warning indicator. For continuously transmitting
radar, use the LRD 747/LRD 757 to get accurate detection from a
safe distance. Weak signals cause the audio and visual alarms to
sound intermittently, but as the signal gets stronger (the closer
you get to the radar gun), both alarms increase in intensity.

Instant-on transmitters fire a short radar pulse beam at a vehicle
and instantly read its speed. When detected at a distance, you will
hear a few beeps and see the strength meter begin to light.
Instant-On radar signals are the most difficult to detect at a safe
distance because they are transmitted only when directed at you

IMPORTANT INFORMATION ABOUT YOUR NEW LASER/RADAR DETECTOR

or at a vehicle directly ahead of you.

SPEED DETECTION

4

LASER

▼

The Laser Speed Detection System, also called LIDAR (for Light

etection and Ranging), uses a laser gun that emits infrared light

D
pulses just outside the spectrum of visible light. Each reflected
pulse measures the speed of the object coming toward or going
away from the laser gun.

Unlike radar, the laser gun emits a very narrow beam of light, so
it can pinpoint a speeding car within traffic. The infrared beam
spreads out, but slowly and over a longer distance than a
radar signal.

To be safe, do not
ignore any warnings.
Although there are
other types of radar
signals that may
cause interference,
when the
LRD 747/LRD 757
detects a signal, be
on the alert. It is
important to exercise
caution at all times.

The laser gun can acquire a speed reading as quickly as 0.3
seconds, sometimes less. However, since it isn’t easy to accurately
aim at and hit a moving target, an operator often moves the laser
gun in several directions to get a reading. So laser signals
are emitted continuously for a few seconds for each
speed measurement.

SPEED DETECTION

The LRD 747/LRD 757 can detect these light pulses from as far
away as 1.5 miles, which is about four times the effective
range of a laser gun (2,000 feet), and about ten times its
average operating range (500-800 feet).

5

CONTROLS AND FUNCTIONS

1. Clip Release — Press the clip release button to remove the
LRD 747/LRD 757 from the windshield mounting clip.

2. Rear and Side Laser Detector Lense — For rear and side
detection of laser signals.

3.

4.

5.

6. Speaker — Sounds audio alert. There are six different audio
alert tones to distinguish each type of signal received. When
you become familiar with all the distinct alert tones, you can
operate the LRD 747/LRD 757 just by listening, devoting
your full attention to the traffic in front of you.DC 12V
Power Input — Connect the DC power cord here.

7. DC 12V Power Input — Connect the DC power cord here.

8. On-Off/Volume Control — Turns the power on and adjusts
the Audio Alert volume.

9. LED Panel — LEDs display visual alerts, signal strength, and

AND FUNCTIONS OF YOUR LASER/RADAR DETECTOR

operation mode.

NOTE: Foldout the
back cover of this
reference guide to
refer to the “Controls
& Functions” page.

Press the
alarms while driving in the city. When you turn
on the City Mode, the City indicator turns on.
While driving on highways, turn off the City
Mode for long-range detection.

Press the
Only operation. All the LEDs dim, and the signal
strength meter is disabled.

Press the
feature, which produces a full alert level when a
signal is first received, then automatically
reduces to chirps for the rest of the warning.

city

button to help reduce X-band false

audio

button to activate the Audio Alert

mute

button to activate the Auto Mute

CONTROLS

6

Every time you turn
on the LRD 747/LRD
757, a self test is
performed for all LEDs
and Alert tones. You
will hear, in-order,
four distinct tones for
the X-, K-, and
Ka-SuperWideband
radar bands, as well
as for laser, laser L2
and SWS.

LED PANEL

D1) X-Band Signal Indicator—AgreenLEDlights and blinks to indicate

the presence of an X-band radar signal. The blink rate increases as
the radar source gets closer. A distinct audio alert is also heard.

D2) K-Band Indicator — An amber (orange) LED lights and blinks to

indicate the presence of a K-band radar. The blink rate increases as
the radar source gets closer. A distinct audio alert is
also heard.

D3) Ka-SuperWideband Signal Indicator—AredLEDlights and blinks to

indicate the presence of a Ka-SuperWideband radar signal. The blink
rate increases as the radar source gets closer. A distinct audio alert is
also heard.

D4) Power-On Indicator—AgreenLEDunder P lights to indicate power

is being supplied to the unit and the unit is turned on.

D5) LED Signal Strength Meter — Three LEDs give an accurate visual

indication of the strength of radar or laser signals.

D6) City Mode Indicator—AgreenLEDunderClights to indicate that

you selected City Mode.

D7) Auto Mute Indicator—AredLEDunderMlights to indicate that

you selected the Auto Mute feature.LED Signal Strength Meter —
Three LEDs give an accurate visual indication of the strength of
radar or laser signals.

D8) Laser Signal Indicator — For laser signals, a red LED underLlights

and blinks to indicate the presence of a laser signal. For the
UltraLyte laser gun, an amber LED underLlights and blinks to
indicate the presence of a UltraLyte laser signal. A distinct audio
alert is also heard.

D9) SWS Signal Indicator — When an early warning hazard or

informational signal is detected, the green SWS LED begins to blink.
A distinct audio alert is also heard.

D10) VG2 Signal Indicator — A rapid flashing red and green LED

indicates the presence of a VG2 signal.

CONTROLS AND FUNCTIONS

NOTE: Foldout the
back cover of this
reference guide to
refer to the “Controls
& Functions” page.

7

INSTALLATION

The LRD 747/LRD 757 uses a highly sensitive horn-type antenna
and IR laser sensor to receive laser/radar signals. Its sensitivity
and range depend on the method of installation and the direction
of the antenna/sensor in relation to the signal source. The
inherent nature of radar waves makes them reflect off metallic
surfaces. This is why these waves are so useful for measuring the
speed of a vehicle. The IR laser light may reflect only from shiny
surfaces. Both radar waves and IR laser light will, however, pass
through plastic or glass.

Before you decide where to put your radar detector, please keep in
mind these two important factors:

For safety, do not mount the LRD 747/LRD 757 in a location

•

where it will obstruct your driving vision.
Most vehicles have the top part of the windshield tinted.

•

Mounting the LRD 747/LRD 757 behind tinted or mirrored
glass may reduce the effectiveness of laser detection by
reducing the amount of laser light received by the dectector.

OF YOUR NEW LASER/RADAR DETECTOR

INSTALLATION

8

HELPFUL TIPS

The antenna and the forward looking sensor are located
behind the rear panel of the unit, (and the rear- and
side-looking sensors are located on top of the unit), directly
behind the mode selection keys. The antenna and sensors
should not be obstructed by metal or metallic surfaces
and should be pointed at the horizon for accurate
long-range detection.

Do not mount the unit behind the windshield wiper blades,

•

radio antenna, tinted glass area, or mirrored glass. Be sure
the unit is free from obstruction by seat backs, rear view
mirror, sun visors, or the ceiling of the automobile.
Do not mount the unit in front of the heater or

•

defroster vents.
Do not leave the unit in direct sunlight or in the glove

•

compartment of a closed car for long periods of time, as
extreme changes in temperature may cause internal damage.
Also, removing the unit from the windshield makes you less
susceptible to break-in and theft.

INSTALLATION

9

ADJUSTING THE WINDSHIELD MOUNTING CLIP

1) The metal portion of the bracket locks into the plastic
portion at three different positions. These positions can be
used for vehicles with different vertical angles of their
windshields. The back position can be used for vehicles with
windshields that are slanted back

2) For optimum laser detection, bend the angled portion of the
windshield mounting bracket so that the LRD 747/LRD 757
is parallel to the road surface. Be sure the LRD 747/LRD 757
is mounted so it is free of obstructions from seat backs, rear
view mirror, sun visors, or the ceiling of the automobile.
There must be a clear 360° line of sight to the outside of the
vehicle.

To mount the LRD 747/LRD 757:

1) Press the button on top of the radar and insert the
windshield clip into the LRD 747/LRD 757. The metal
portion of the bracket locks in to the plastic portion.

2) Place the bracket and the LRD 747/LRD 757 in the proper
location on the windshield of your vehicle, and press the
suction cups firmly against the windshield.

10

Use only a Uniden
supplied power cord
or its replacement.

CONNECTING THE POWER

The LRD 747/LRD 757 is designed to operate on most 12 VDC
negative ground vehicle electrical systems. The power cord
provided with the unit has a cigarette lighter socket plug at one
end and a small connector at the other.

1) Insert the small connector into the jack on the side of
the unit.

2) Insert the other end into the cigarette lighter socket of
your vehicle.

When installing the power cord, make sure that:

•

The socket is clean to allow proper contact.

•

The power cord does not block the antenna area on the back
of the unit

.

INSTALLATION

Your unit also comes with ten power cord mounting clips. You
can use these clips to attach the power cord to the window frame
or other parts of the vehicle, keeping it neat and out of the way.
Use the double-sided foam tape squares to attach each clip. Slip
the power cord into the clip to hold it securely in place.

11

REPLACING THE FUSE

The cigarette lighter plug contains a 1-ampere fuse to protect it
from power surges.

1. To replace the fuse, unscrew the top of the plug.

2 Remove the fuse and replace it with the same type.

3. To replace the top, push in the two metal contacts and twist
into place.

12

OPERATION

You are now ready to enjoy the convenience and security of your
LRD 747/LRD 757. Please read this section of the Reference Guide
carefully to familiarize yourself with the basic operation of this
unit.

POWER ON

Turn the
power up the LRD 747/LRD 757, it performs a self-test of all its
circuits. This test takes about 5 seconds, during which you will
hear the different alarm tones and see all the LEDs. First, you will
hear the X-band alarm for 2 seconds while the X-band indicator
lights. The test also checks the signal meter LEDs. It is best to
adjust the audible alarm during the self-test. Next you’ll hear the
K-band alarm while the K-band indicator and City LED lights,
Ka-SuperWideband alarm while the Ka-Band indicator and mute
LED lights. The laser alarm and the SWS alarm will each alarm
for 1 second, while the City and Mute LED light. The VG2 alarm
will alarm for 2 seconds while the City and Mute LED light.(The
power LED remains on until you turn off the unit.) When turned
on the LRD 747/LRD 757 always returns to its last setting.

After the LRD 747/LRD 757 confirms proper operation,
the alert tones and all LEDs, except the green Power LED, turn
off. If the Power LED does not light, check the cigarette lighter
socket connection. If the unit turns on and off intermittently, or
the alert tone sounds too often for no reason, check the power
cord connection at both ends to be sure it is not loose.

OF YOUR NEW LASER/RADAR DETECTOR

Adjust the
your vehicle. The volume level does not have any effect on the
unit’s sensitivity. It is best to adjust the audible alarm during the
self-test.

volume

control to switch on the power. When you

VOLUME CONTROL

volume

control to a comfortable alarm tone level for

OPERATION

OPERATION

13

MEMORY RETENTION FEATURE

The Memory Retention Feature retains the LRD 747/LRD 757’s
operational settings in memory for at least 2 days without power.
When you turn on the LRD 747/LRD 757, it will be in the same
mode as when you turned it off.

FULL WARNING

When the LRD 747/LRD 757 detects a radar, laser, or safety
warning signal, it emits a distinct warning tone and the
corresponding alert LEDs (
and blink. The blink rate of the LEDs increases and the signal
strength meter LEDs light successively as the signal source comes
closer.

X, K, Ka, L, SWS or VG2

) will light

AUDIO ALERT ONLY OPERATION

Press the

When Audio Alert Only is selected, the visual alert and signal
strength meter are disabled. In this mode, all lighted LEDs will
dim. Press the
visual) Mode. Do not set the Volume control at minimum when in
Audio Alert Only because there will be no alert.

audio

button for Audio Alert Only operation.

audio

button again for the Full Alert (audio and

14

WARNING

To operate with
visual alert only, set
the volume control to
the minimum.
Remember though,
if the volume control
is turned down and
Audio Only operation
is selected, the alarm
features are
completely disabled.

VISUAL ALERT ONLY OPERATION

You can operate the LRD 747/LRD 757 in Visual Alert Only by
setting the
Alert Mode. At this setting you can barely hear the audio alert
in a quiet environment. Be sure that the Audio Alert Only
indicator is off.

volume

control at the minimum position in Full

AUTO MUTE OPERATION

Press the

mute

button to activate the Auto Mute feature.

OPERATION

When the Mute Indicator is selected, the unit is in Auto Mute
Mode. In this mode you hear the full audio alert when a
signal is first received. The audio alert automatically reduces
to a chirp for the duration of the warning.

15

If you use both the
Audio Only Alert and
City modes, you won’t
receive an audio alert
until you are very
close to the radar
source.

CITY OPERATION

In highly populated areas, you may encounter many devices that
use the same frequencies as radar signals, such as motion
detectors, automatic doors, and intrusion alarms. These devices
may trigger an alert called “falsing.”

To filter most of the weaker signals and get the most accurate
radar signal recognition, press

The City indicator lights.

In City Mode, the combination of visual and audio alert tones
varies based on the strength of the received signal.

city

to turn on the City Mode.

16

LED SIGNAL STRENGTH METER IN CITY MODE

The LED signal strength meter gives you instant information
about the strength of the signal being detected. A weak signal
causes the first LED to light, but as signal strength increases,
more LEDs light. All three LEDs light when full signal strength is
received. Use this meter to judge the distance from the
signal source.

Signal Strength X-, K-, and

Laser

Ka-Super

WideBand

●❍❍ Visual Visual/Audio

●●❍ Visual/Audio Visual/Audio

●●● Visual/Audio Visual/Audio

SAFETY WARNING SYSTEM OPERATION

The Safety Warning System (SWS™) is a new communication
system that will provide an early warning when a road hazard
exists. The LRD 747/LRD 757 is capable of detecting the SWS
signal broadcast on the K-band by either law enforcement or
local departments of transportation. The green SWS LED blinks
while an audible alert sounds. When this alert sounds, you
should tune to local radio traffic reports or prepare to slow
down or stop your vehicle because you could be approaching
an accident, bad road conditions caused by weather, or road
crews or construction.

OPERATION

17

CARE AND MAINTENANCE

The LRD 747/LRD 757 is designed to give you years of trouble-free
service. There are no user-serviceable parts inside, and, except for
the fuse, no maintenance is required. To keep your detector in
new condition, follow these important suggestions:

Never leave the LRD 747/LRD 757 on the windshield when

•

you park your vehicle. The temperature in the vehicle in
summer can reach levels above what is considered to be safe
for this unit

To make you less susceptible to break-in and theft, remove

•

the unit from your windshield when you leave your vehicle.
Do not expose the unit to moisture. Rain, dew, road splash,

•

or other liquids can damage the internal components and
reduce sensitivity of the LRD 747/LRD 757.

.

OF YOUR NEW LASER/RADAR DETECTOR

CARE & MAINTENANCE

18

TROUBLESHOOTING

If your LRD 747/LRD 757 does not perform up to expectations, try
the suggestions listed below. If you cannot get satisfactory results,
call the Uniden Customer Service Center at [phone], 7:00
a.m. to 7:00 p.m. Central Time, Monday through Friday.

Unit does not operate
(Power LED not on).

Unit fails the self test.

Weak detection.

Inaccurate or

OF YOUR NEW LASER/RADAR DETECTOR

erratic detection:

Beeps over bumps or
rough road.

Beeps at same
location.

Signal strength meter
registers, but
no audio.

The unit
bounces against
the windshield.

Check the power cord. Be sure the

•

connectors are properly installed
Be sure ignition key is ON or in the

•

accessory position.
Fuse out. Check and replace.

•

Check power to lighter socket.

•

Vehicle electrical problem exists.

•

Make sure that the volume control is in the

•

ON position.

.

• Clean cigarette lighter socket.

• Call Uniden Customer Service Center,

[phone].

• Check angle of unit. Point to the horizon.

•

Antenna/Sensor is obstructed. Move the
unit clear of any obstruction outside the
windshield, such as a wiper blade.

• Move the unit clear of the window tint.

• Loose power cord. Check both connectors.

•

Power cord is broken. Check and replace.

•

Check that the power cord is connected at
both ends.

•

Clean cigarette lighter socket.

•

Falsing because you have passed a motion
sensor or alarm.

•

For highway use, make sure the City Mode
is OFF.

•

Increase the volume.

•

Reposition the unit so that the bumpers
are firmly against the windshield.

TROUBLESHOOTING

TROUBLESHOOTING

19

General

in. (W) x 4

5

8

in. (D) x

Dimensions: 3
Weight: 3.5 oz
Power Requirements: 13.8 VDC
Temperature Range: Operating: -5°F to 160°F

360° Laser Detector

Receiver Type: Pulse Laser Signal Receiver
Sensor Front End: Convex Condenser Lens
Detector Type: Pulse Width Discriminator
Receiver Bandwidth: 30 Mhz
Spectral Response: 800 - 1100 nm
Alert Hold Time: 3 seconds

Radar Detector

Receiver Type: Double Conversion

Detector Type: Scanning Frequency

OF YOUR NEW LASER/RADAR DETECTOR

Antenna Type: Linear polarized, E vector vertical
Sensitivity: X band = -114 dBm/cm2

Frequency of Operation: 10.490 - 10.560 GHz (X band)

1

9

(-20°C to 70°C)

Storage: -40°F to 185°F
(-40°C to 85°C)

Superheterodyne
Self-Contained Antenna

Discriminator

K band = -104 dBm/cm2
Ka SuperWideband = -10 dBm/cm2

24.040 - 24.260 GHz (K band)

33.40 - 36.00 Ghz
(KaSuperWideband)

5

in. (H)

6

SPECIFICATIONS

Specifications subject to change without notice.

20

INCLUDING LED PANEL