La Crosse Technology WT 3143H User Manual

If it is necessary to set the clock manually, press and hold the SET  
button for 3+ seconds to activate the manual mode. Once the  
clock is in manual mode, there are two ways to move the minute  
hand forward. Hold the SET button down to move the minute hand  
forward consistently. Or, press the SET button rapidly (more than  
once per second) to move the minute hand forward step by step (in  
minute increments). Use these features to move the minute hand  
forward until the correct time is set. The clock will automatically  
leave manual mode after the SET button is not pressed for 6+  
seconds.  
reception is undisturbed. A microprocessor activates the receiver and  
processes the time signal from Fort Collins overnight.  
Through the radio signals, La Crosse Technology atomic clocks always  
keep precise time. The changeover from standard time to daylight  
saving time, and vice versa, takes place automatically with the same  
precision.  
The La Crosse Technology atomic clock is designed for indoor use. For  
indoor locations, select a location to place your radio controlled clock  
where it will be at least six feet away from a TV, computer, air conditioner  
or other household electrical appliances. The optimal location is near a  
window. Windows facing Colorado provide the best signal.  
WT-3143H  
Radio Controlled Analog Clock  
Reset: If the clock does not respond to the various function  
modes, you can reset the clock by pressing the RESET button on  
the movement case.  
Quick Setup Instructions  
Notes:  
Do not submerge clock in water.  
Extreme temperatures, vibration, and shock should be avoided to  
prevent damage to the clock.  
Internal Synchronization: Once the clock has been set correctly  
by the radio signal, the clock’s CPU operates continuously. To  
ensure accuracy, the clock synchronizes the position of the second  
and minute hands to the time calculated by the CPU every day.  
Second hand synchronization occurs at 1:30 a.m. and 9:30 a.m.  
and minute hand synchronization occurs between 1:50 and 2:01  
am every day.  
Welcome to the world of atomic timekeeping technology. We hope you  
will enjoy the convenience of never having to set your clock again and  
the confidence of knowing exactly what time it is.  
The WWVB time signal will easily penetrate masonry and wood framed  
buildings. The WWVB signal will penetrate almost every residential  
building and most steel buildings if they have adequate windows. It is  
not possible, however, for the WWVB signal to penetrate most indoor  
shopping malls and rooms in the center of large office buildings that do  
not have windows. In buildings that WWVB cannot penetrate you may  
set the time using the manual time set button. When the clock receives  
the WWVB signal it will automatically set the hands to the exact time.  
A locking pin may be placed into the movement at the factory to  
prevent shifting of the hands during shipment. Remove the locking  
pin directly below the Reset button. This will unlock the hands and  
enable the clock to set itself after receiving the signal.  
Set the clock to your time zone by moving the indicator arrow to  
appropriate zone: P (UTC-8 Pacific Time), M (UTC-7 Mountain  
Time), C (UTC-6 Central Time), E (UTC-5 Eastern Time)  
Signal Interference: In some cases, the signal can be affected by  
weather conditions and electrical interferences, or the location of  
the clock itself may result in poor reception. If the clock has not  
synchronized to the correct time within a few days of activation, you  
may wish to move the clock to a different location. Try to place it  
near an outside wall closest to the direction of Colorado. Avoid  
placing the clock near electrical items such as TVs, microwave  
ovens and computers.  
La Crosse Technology atomic clocks do not receive or process  
radio controlled time signals from Germany’s DCF 77, Japan’s J Ga  
AS, or England’s MSFs atomically regulated transmitters. La  
Crosse Technology atomic clocks can be manually set and used  
anywhere. Please Note: WWVB time will over ride a manual setting.  
Enable the Daylight Savings Time Auto Adjust feature by moving  
the DST switch to “ON”. If you are in a time zone that does not  
follow DST, make sure you set the DST mode to “OFF”. The  
Daylight Savings Time feature is disabled when the switch is set to  
“OFF”.  
For more information on the NIST and radio controlled time, see  
Insert 1 new AA, LR6 1.5 volt ALKALINE battery in the analog  
clock battery compartment according to the polarity marked on the  
case.  
WAVE BUTTON  
SET BUTTON  
DAYLIGHT SAVING TIME  
The National Institute of Standards and Technology and WWVB encode  
a special DST “bit” in the WWVB transmission for DST. Your La Crosse  
Technology clock will read this information and automatically advance  
the hands one hour in the spring and eleven hours in the fall.  
Once the battery is installed, the radio reception mode is activated  
and the second, minute and hour hands will automatically reset to  
the 12:00 position. Once the hands are in the 12:00 position, the  
movement will start searching for the radio signal. The search  
procedures takes approximately 3 to 10 minutes after all hands  
have set to the 12:00 position. If a signal is found within the first 3  
to 10 minutes, the clock will set to the correct time. If the clock  
does not receive a radio signal soon after activated, the clock will  
start running from the 12:00 position and will continue to run. In  
this case, do not attempt to reset the hands manually even though  
the time displayed on the clock is incorrect. The clock is  
RESET BUTTON  
BATTERY  
COMPARTMENT  
WARRANTY  
La Crosse Technology, Ltd provides a 1-year limited warranty on this  
product against manufacturing defects in materials and workmanship.  
TIME ZONE SWITCH  
DST ON/OFF BUTTON  
This limited warranty begins on the original date of purchase, is valid only  
on products purchased and used in North America and only to the  
original purchaser of this product. To receive warranty service, the  
purchaser must contact La Crosse Technology, Ltd for problem  
determination and service procedures. Warranty service can only be  
performed by a La Crosse Technology, Ltd authorized service center.  
The original dated bill of sale must be presented upon request as proof  
of purchase to La Crosse Technology, Ltd or La Crosse Technology,  
Ltd’s authorized service center.  
NOTHING IS MORE PRECISELY MEASURED THAN TIME!  
Since the beginning of time, man has been fascinated with the  
measurement of time and has devised more accurate machines to trap  
and measure time. Today, time is precisely measured in the United  
States by the most accurate clock in North America, the Atomic Clock of  
the US National Institute of Standards and Technology, Time and  
Frequency Division in Boulder, Colorado. A team of atomic physicists  
continually measures every second of every day to an accuracy of ten  
billionths of a second per day. These physicists have created an  
international standard, measuring a second as 9,192,631,770 vibrations  
of a Cesium 133 atom in a vacuum. This atomic clock regulates the  
WWVB radio transmitter located in Fort Collins, Colorado, where the  
exact time signal is continuously broadcast throughout the United States  
at 60 kHz to take advantage of stable long wave radio paths found in that  
frequency range. Radio waves at these low frequencies use the earth  
and the ionosphere as a wave-guide and follow the curvature of the earth  
for long distances.  
synchronizing to the WWVB signal and once the radio signal is  
decoded, the hands will automatically adjust to the correct time.  
The WAVE button can be used to attempt an enforced signal  
receipt. To activate, hold the WAVE button down for 3+ seconds.  
Once the WAVE feature is activated, the hands will automatically  
reset to the 12:00 position, and the movement will attempt to  
enforce a signal receipt from Fort Collins, CO. If the movement  
successfully receives the signal, the clock will reset automatically to  
the correct time. Generally, the signal enforced receipt takes  
approximately 3-8 minutes. If the clock still fails to receive the  
signal while in the WAVE mode, the clock will automatically leave  
the WAVE mode. In this case, set the clock manually according to  
instructions below and the time keeping function will be controlled  
by the movement’s micro-CPU.  
La Crosse Technology, Ltd will repair or replace this product, at our  
option and at no charge as stipulated herein, with new or reconditioned  
parts or products if found to be defective during the limited warranty  
period specified above. All replaced parts and products become the  
property of La Crosse Technology, Ltd and must be returned to La  
Crosse Technology, Ltd. Replacement parts and products assume the  
remaining original warranty, or ninety (90) days, whichever is longer. La  
Crosse Technology, Ltd will pay all expenses for labor and materials for  
all repairs covered by this warranty. If necessary repairs are not covered  
by this warranty, or if a product is examined which is not in need or  
repair, you will be charged for the repairs or examination. The owner  
must pay any shipping charges incurred in getting your La Crosse  
Technology, Ltd product to a La Crosse Technology, Ltd authorized  
Manual Set: On rare occasions in certain areas, the clock may not  
be able to utilize the radio-controlled function because of either the  
strength of the signal or the geographic location. In this case, the  
clock can be set manually and used as a regular quartz wall clock.  
The built in antenna system will receive the WWVB signal anywhere in  
North America within 2000 miles of Fort Collins where long-wave radio  

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