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RADIO CONTROLLED ANALOG CLOCK

 

 

INSTRUCTION MANUAL 

 
Quick set up instructions 
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

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

Twist and lift open the battery compartment cover at the back of the clock 
and insert 1 fresh AA, LR6 1.5 volt ALKALINE battery according to the 
polarity marked on the case.  

 

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.  If a signal is not receivable, it will fast-forward the hands to the 4, 8, 
or 12 o’clock position and search for WWVB every two hours until a signal is 
received.  If the time is manually set, the clock will continue to periodically 
search for a signal and automatically reset the hands when the signal is 
received. 

 

Press time zone button to select a time zone after the clock received the 
WWVB signal. If you are in the Pacific Time Zone- you are ready to hang 
your clock. 
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.  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 recognize 
DST (Arizona and Indiana) you must press the (unmarked) DST button 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). 

 

Replace the battery compartment cover. 

                       

THAT’S IT! During the night your clock will automatically set itself. 

 

 
 
 
 
 
 
 
 
 

 
 
 
 
 
 
 
 

BATTERY COMPARTMENT 
COVER 

BATTERY

COMPARTMENT

 

2

MANUAL TIME SET

BUTTON

PACIFIC TIME

CENTRAL TIME 

 
 
 
 
 

 
 
 

 
 

 
 
 
 
 
 
 

For a better understanding of how and why your clock works please continue 
reading. 
 
NOTHING IS MORE PRECISELY MEASURED THAN TIME! 

And nothing keeps track of time more precisely and trouble free than La 

Crosse Technology atomic clocks. 

 

 

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. 

 

 

The built in antenna system 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. 

 

 

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. 

 

ADDITIONAL DETAILS

 

 

To set up your clock simply install one fresh AA, LR6 ALKALINE battery. 

Due to the nature of long wave radio signals it is normally not possible to receive a 
signal during the day so it is best to install the battery late in the evening. 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. The time zone buttons 
may be pressed any time after installing the batteries. 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.  Another time zone can be selected 
during or after the clock has set itself.  Your clock can only set itself to one of the 
four time zones stated above.  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. 

 

 

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, or it will determine that the signal is not receivable at its 
current location and time of day.  If a signal is not receivable it will fast-forward the 
hands to the 4, 8, or 12 o’clock position and search for WWVB each even 
numbered hour until a signal is received.  If the time is manually set the clock will 

BATTERY 
COMPARTMENT 

EASTERN TIME 

MOUNTAIN TIME

DST ON/OFF BUTTON 

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