GT-138XI
GT-138Xi
Total Band Protection
LASER-RADAR
DETECTOR
User Guide
™
INTRODUCTION
Dear Whistler Customer,
If you have questions concerning the operation of this
Whistler product please call:
Customer Service
Monday - Friday • 8:00 am - 5:00 pm CT
Please keep the receipt in a safe place. You may register
your product online at www.whistlergroup.com. For
warranty verification purposes, a copy of your dated store
receipt must still accompany any unit sent in for warranty
work. If the unit is returned without a dated store receipt,
an out-of-warranty service charge applies. Note: Your
warranty period begins at the time of purchase. The
warranty is validated only by the dated store receipt!
Please record the serial number of the unit in the space
provided in the accessories section of the guide.
To fully acquaint yourself with the operation of your
Whistler detector and to better understand the
differences between detecting radar, laser, and safety
radar signals, we recommend reading this entire guide or
visiting our FAQ page on our website
www.whistlergroup.com
Enjoy your Whistler detector and please drive safely.
1-479-273-6012
or visit our website
www.whistlergroup.com
Sincerely,
The Whistler Group, Inc.
3
TABLE OF CONTENTS
Model Features Summary......................................... 5 - 6
Installation ................................................................... 7 - 9
• Mounting Guidelines
• Windshield Mounting
• Power Cord Connection And Fuse Replacement
Operation ................................................................ 10 - 14
• Power On and Self-Test
• Feature Engaged Confirmation
• Auto Quiet Mode
• Quiet Mode
• Audio Level Adjustment
• Highway Mode
• City, City 1, City 2 Modes
• Vehicle Battery Saver Mode
• VG-2 Detection
• Dim/Dark Mode
• Setting Saver
• Ka Narrow Band
• FDSR/TFSR Rejection Modes
Laser & Radar Alerts ......................................................15
• Laser Audio/Visual Alerts
• Laser Tips
• Pulse Protection®
VG-2/POP Alerts ............................................................16
Option Select Mode ......................................................17
Troubleshooting Guide .................................................18
Care & Maintenance ......................................................19
Reset Features ................................................................19
4
TABLE OF CONTENTS
Speed Monitoring Technologies ......................... 20 - 22
• Radar Facts
• Laser Facts
• Other Speed Detection Systems
Warranty Information ............................................ 23 - 26
Specifications ..................................................................27
Accessories ......................................................................28
5
WHISTLER FEATURES
6
10
1
2
8
7
17
9
3
131615
4 5
6
121114
FEATURE DESCRIPTIONS
1. Bracket Release Button – provides quick and easy release of the
mounting bracket.
2. Speaker – provides distinct audio warnings for X, K, Ka band radar,
safety warning system, laser and VG-2.
3. Mounting Bracket Location – slot holds mounting bracket firmly.
4. Radar Antenna – compact, high-efficiency antenna receives radar
signals.
5. Front Laser Antenna – high gain optical lens provides increased
sensitivity and field of view for leading-edge laser detection.
6. Rear Laser Antenna – an integrated optical waveguide provides
superior detection of laser signals transmitted from behind.
7. City Button – reduces the annoyance of false alerts typically
encountered in urban driving areas.
8. Power / Volume Control – turns unit on/off and adjusts audio level.
9. Icon Display – offers easy-to-read display to indicate power, city
mode, radar band identification, and signal strength.
10. Quiet / Menu Button – pressing QUIET before a signal is detected
engages Auto Quiet Mode which automatically reduces the audio
level after the initial warning to a low audio level setting. Pressing
QUIET during a radar/laser encounter silences audio alerts, while
allowing visual alerts to keep you informed. Pressing and holding for
2 seconds allows you to enter Option Select Mode
11. X / K Band Indicator – shows the unit is receiving an X-band or a K
band signal (flashing).
12. Ka - Band Indicator – shows the unit is receiving an Ka-band signal.
13. P - Power On Indicator – shows that the unit is operating and in
Highway mode.
14. C - City Indicator – shows that the unit is operating in City Mode.
15. Signal Strength Indicator – shows the strength of the signal being
detected.
16. V / L – shows that the unit is receiving a VG-2 or Laser signal.
17. Dim / Dark Mode – engages Dim/Dark modes.
7
INSTALLATION
Windshield Mounting
• Mount the unit as low as possible near the center of the
windshield.
• Do not mount the unit behind wipers, ornaments, mirrored
sunscreens, etc. These obstructions have metal surfaces which
can affect radar and laser signals and reduce critical warning
time. (Regular tinted glass does not affect reception).
• Some windshields have an Instaclear™ or Electriclear™ type
coating, which affect radar signals. Consult your dealer or the
owner’s manual supplied with your vehicle to determine if your
windshield has this coating.
• Avoid placing the unit in direct contact with the windshield.
• To reduce the possibility of theft, conceal the unit when not in
use.
Windshield Mounting
IMPORTANT: Make sure the unit is level.
8
INSTALLATION
Windshield Mounting
• Install the two suction cups and rubber bumper onto the
bracket by fitting them into their holes.
• Press the suction cups onto the windshield at the location you
have chosen.
Rubber Bumper
IMPORTANT: Some newer cars have a plastic safety coating on
the inside of the windshield. The windshield bracket may leave
permanent marks on this type of surface. To find out if your
vehicle has this type of windshield, check the vehicle’s owner’s
manual or ask your dealer. We recommend that you do not leave
the suction cup bracket on the window in direct sunlight. If the
detector is removed, this may cause blistering of the dash in
some vehicles.
• Slide the detector onto the bracket until it locks into place.
• If necessary, the unit may be leveled by bending the
windshield bracket. Press the bracket release button and
remove the detector before bending.
9
INSTALLATION
Power Connection
• Plug the small end of the power cord into the unit’s power
jack.
• Plug the large end into the vehicle’s cigarette lighter socket.
NOTE: Cord fits tightly into detector. When installing the cord,
expect some resistance.
Fuse Replacement
The lighter socket plug is equipped with a replaceable 2 amp,
3AG fuse located behind the silver tip. To replace the fuse,
carefully unscrew the tip of the plug.
IMPORTANT: Unscrew slowly. The tip contains a spring which
may fly out when disassembling. Insert the new fuse with the
spring and screw on the tip. With use, screw cap on plug may
loosen. Retighten occasionally.
Unscrew the tip of the lighter socket plug carefully when replacing the
2 amp fuse.
10
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