La Crosse Technology WT-981C, WT-992BLK, WT-971S, WT-971L, WT-983C User Manual

WWVB-RADIO CONTROLLED WATCH

The NIST (National Institute of Standards and Technology-Time and
Frequency Division) WWVB radio station is located in Ft. Collins,
Colorado, and transmits the exact time signal continuously at 60 kHz.
The signal can be received up to 2,000 miles away through the
internal antenna in the La Crosse Technology watch. However, due

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to the nature of the Earth's Ionosphere, reception is very limited
during daylight hours.
The Watch will search for a signal every night when reception is best.
The WWVB radio station derives its signal from the NIST Atomic
clock in Ft. Collins, Colorado. A team of atomic physicists is
continually measuring 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 watch is
regulated by the WWVB transmitter.
For more information on WWVB and the NIST Atomic clock please
visit their website at
http://www.boulder.nist.gov/timefreq/stations/wwvb.htm

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SET-UP GUIDE, FEATURES AND OPERATION

A

DISPLAY OF HOURS/MINUTES

Recessed

button

Digital LCD

nalogue display

Push-piece

button

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Normally upon purchase, the watch will already display the correct
time and date, and it will not be necessary to use the manual
settings.

 Hours and Minutes are shown using the analog display.
 Date and Seconds are shown in the digital LCD.

DIGITAL DISPLAY OF DATE, SECONDS, AND WWVB
RECEPTION CONTROL

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Press and release the PUSH-PIECE to toggle between the displays:

• Month and Day
The Date appears as Month and day (ex: 12.30)

• Or Seconds and WWVB Signal Reception Icon

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Manual Setting

TIME & DATE

If the wristwatch is not able to receive the WWVB signal, you may set
the time manually.

IMPORTANT:

If the WWVB signal is received correctly, the symbol (tower) is
shown, and setting the time and date manually is not possible.

1. To change the setting mode for time and date, press the PUSH-
PIECE and the RECESSED BUTTON simultaneously for about
4 seconds. The seconds will flash in the LCD display.

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