La Crosse Technology Clock WT 3128 User Manual

recognize DST (Arizona) you must press the DST button (unmarked – just above  
and between the Central and Eastern time zone buttons) for one second to  
deactivate your clock’s DST program.  
For time zones outside of PT, MT, CT or ET you must manually set the time using  
the Manual Time set button on the back of the movement. (See instructions  
below).  
MANUAL TIME SET  
BUTTON  
Please Note: WWVB time will over ride a manual setting.  
BATTERY  
COMPARTMENT  
Model WT-3128  
ADDITIONAL DETAILS  
For a better understanding of how and why your clock works please continue reading.  
PACIFIC  
TIME  
EASTERN TIME  
Radio Controlled Analog Clock  
Quick Setup Instructions  
DST ON/OFF  
BUTTON  
NOTHING IS MORE PRECISELY MEASURED THAN TIME!  
And nothing keeps track of time more precisely and trouble free than La Crosse  
Technology® atomic clocks.  
MOUNTAIN TIME  
CENTRAL  
TIME  
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.  
Since the beginning of time, man has been fascinated with the measurement of time  
and has devised more accurate machines to 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. From here the  
exact time signal is continuously broadcasted 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.  
TO SET THE TIME USING THE MANUAL TIME SET BUTTON  
In some cases, the La Crosse Technology® atomic clock may not receive the WWVB  
signal due to atmospheric disturbances or hard to reach locations such as inside  
shopping malls. In this case, please use the Manual Time Set button, located at the  
back of the clock to manually set the time. To do this:  
MANUAL TIME  
SET  
The built in antenna system in your clock will receive the WWVB signal anywhere in  
North America within 2000 miles of Fort Collins where long-wave radio reception is  
undisturbed. A microprocessor activates the receiver and processes the time signal from  
Fort Collins overnight.  
BUTTON  
INTIAL SETUP  
Insert 1 new AA, LR6 1.5 volt ALKALINE battery into the digital clock battery  
compartment (the lower battery compartment) according to the polarity marked on  
the case.  
Insert 1 new battery AA, LR6 1.5 V into the analog clock battery compartment  
according to the polarity marked on the case.  
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.  
1.  
2.  
3.  
Remove the battery and press the Manual set button 10 times.  
Insert 1 new AA Alkaline battery.  
Press and hold the Manual Set button until the second hand of the clock moves  
to the 12 position.  
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.  
4.  
Release the Manual Set button and again press and hold the Manual Set button.  
The minute and hour hands will fast-forward while the button is held.  
Keep holding the Manual Set button until the time is set as required.  
Release the button. About 3 seconds later, the second hands will start to move  
and the clock is now running with manual time.  
5.  
6.  
The optimal location is near a window. Windows facing Colorado provide the best  
signal.  
BATTERY  
COMPARTMENT  
BATTERY  
FOR THE  
Do not submerge clock in water.  
COMPARTMENT  
ANALOG CLOCK  
FOR THE DIGITAL  
CLOCK  
Extreme temperatures, vibration, and shock should be avoided to prevent damage  
to the clock.  
Note: When the clock displays manual time, it will continue to try to receive the WWVB  
signal at each of the even numbered hours: 0:00, 2:00, 4:00, 6:00 … 20:00 & 22:00.  
The WWVB time signal will easily penetrate masonry and wood framed buildings.  
DIGITAL CLOCK  
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.  
1.  
Remove the battery cover at the back of the clock and insert 1 AA Alkaline battery  
in the battery compartment.  
2.  
All segments of the LCD will light up briefly, then the display “-:--“ and the current  
indoor temperature will be displayed  
Once the battery is installed, the clock will begin searching for a signal. For the  
initial setting, it is recommended to stand the clock in an upright position near a  
window. Within five minutes the clock will either receive the WWVB signal and  
set itself to the exact time (for the default Pacific Time Zone), or it will determine  
that the signal is not receivable at its current location and time of day. The clock  
will fast-forward the hands to the 4, 8, or 12 o’clock position immediately and  
search for WWVB at a specific time until a signal is received.  
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.  
Note: If the Display time is pressed while the analog clock is still searching for the  
WWVB signal, the digital clock will display “--/--“ for the date and “-:--“ for the  
world time.  
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.  
3.  
Wait for the digital clock to receive the WWVB time and date from the analog  
clock. Then the digital clock will start normal runs.  
Note: If the time is manually set, the clock will continue to periodically search for a  
BATTERY COMPARTMENT  
COVER  
signal and automatically reset the hands when the signal is received.  
Please Note: WWVB time will over ride a manual setting.  
Once the clock has received the WWVB signal, press the time zone button to  
select your time zone. If you are in the Pacific Time Zone, no change is needed  
and you are ready to hang your clock.  
For more information on the NIST and radio controlled time, see  
DISPLAY  
KEY  
TIME SET KEY (FOR  
WORLD TIME)  
If you are not in the Pacific Time Zone, select your time zone by pressing one of  
the four time zone buttons PT-Pacific Time, MT-Mountain Time, CT-Central Time,  
ET-Eastern Time and holding this button down for 5 seconds. If multiple buttons  
are pressed, the clock will set to the time zone selected last. If no time zone is  
selected the clock will default to Pacific Time. If you live in an area that does not  
BATTERY COMPARTMENT  
1
 

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