La Crosse Technology EH-21G Manuale Utente

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Analog Watch Instruction Manual 
 
Welcome to the world of radio-controlled timekeeping 
technology. We hope you will enjoy the convenience of 
never having to set your watch again and the confidence of 
knowing exactly what time it is. Your new radio-controlled 
watch is a special edition produced by La Crosse 
Technology specifically for E. Howard.  It will provide you 
with years of trouble free, easy operation and the most 
accurate time in the world. 
 
1. 
Description of WWVB 
The most accurate clock in the United States is the 
atomic cesium clock located at: 
 
U.S. Department of Commerce 
 
National Institute of Standards and Technology 
(NIST) 
 Boulder, 
Colorado 
Your atomic watch receives time signals on long wave 
radio (60 kHz) from the NIST operated WWVB time 
signal transmitter located in Fort Collins, CO and 
coupled with the atomic cesium clock in Boulder.  Until 
recently, the transmitter was used predominantly by 
telephone companies, radio and television stations, 
navigations of planes and ships and for scientific 
purposes in laboratories.  Now this precise signal can 
be received by the atomic watch technology. 
 
Your atomic watch receives the WWVB time signal via 
its built-in antenna system.  The proper function of the 
receiver contained in this product has been tested as a 
prototype with regard to its sensitivity and range of 
reception in different places throughout the United 
States. 
 
Any claim for warranty – express or implied – due to the 
watch’s failure to properly receive the radio signal due 
to interference, whatever may be the source of this 
interference, are hereby expressly excluded in all 
respects.  For more information about the WWVB-
Radio signal please visit the NIST website at: 
www.boulder.nist.gov
For actual signal coverage in North America please 
visit:  
www.boulder.nist.gov/timefreq/stations/wwvbcoverage.
htm
 
 
 
 
 
 
 
 
 
 
 
The atomic watch’s internal computer processes the 
received time signals and automatically synchronizes 
the hands, date and the change over between daylight 
saving time and standard time as well as the leap year 
accordingly.  The signal reception and synchronization 
occur automatically every night and manually upon 
demand. 
 
Even outside of the reception range your atomic watch 
will continue to keep excellent time.  The highly 
accurate 32 kHz quartz movement will ensure precise 
time keeping. 
 
2. Functional 
Description 
 
T1 Button (mode): 
 
The T1 button has two functions: 
1. 
Switches the digital display between date (for 
example 12.19) and seconds (for example 32). 
2. 
Receives the WWVB time signal and synchronizes 
the time automatically if you press it for longer 
than 3 seconds. 
 
T2 button (adjust): 
 
Depending on the mode the T2 button either: 
1. 
Indication of adjusted time zone (T2 < 3 sec). 
2. 
Advances the time zone in 1-hour increments 
when setting the time zones. 
3. 
Advances the hands when manually synchronizing 
the watch. 
 
 
 
 
 
 
 
 
 
 
3. 
Synchronizing the Time (signal reception) 
The signal reception and synchronization occurs 
automatically every night.  At any desired time you can 
perform a “manual” reception by pressing the T1 button 
for at least 3 seconds.  The hands will set to the 12 
o’clock position (if the hands set to a time other than 
exactly 12 o’clock they must be repositioned.  See 
under 5. Replacing the battery) during reception and 
will reset themselves thereafter.  Note that your atomic 
watch will not receive the WWVB time signal if set to a 
time zone other than Pacific, Mountain, Central or 
Eastern standard time. 
 
4. 
Setting the Time Zone 
 
The time preset by the factory might not be the correct 
time for the time zone you are in.  To set the correct 
time zone please follow the instructions listed below: 
 
1. 
Press the T2 button.  The digital display will 
change from displaying the date (for example, 
12.19) to displaying the current hour (for example 
P02 PM).  The letter P, M, C or E in front of the 
digitally displayed hour stands for Pacific, 
Mountain, Central or Eastern standard time zone 
respectively.  If no letter is displayed in front of the 
hour a different time zone has been selected.