La Crosse Technology EH-21G Instruction Manual

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.