La Crosse Technology WT-8112U Instruction Manual page 5

SETUP AFTER CHANGING/REPLACING THE BATTERY
1. After powering up the solar clock, all LCD segments will light
up briefly and it will show the time (12:00), indoor
temperature, date, and indoor humidity.
2. Next the WWVB time code reception will automatically start.
This reception typically takes 10 minutes in good conditions. If
after 10 minutes the WWVB time has not been received, use
the ―SET‖ key to enter the set-up mode to manually set the
Time, Time Zone and Date (see manual settings below). The
clock will continue to search for WWVB each hour between
12am and 6am. When the clock has successfully connected
with WWVB, it will override the manually set time and date.
NOTE: When changing the battery:
1. Be careful that it does not spring free from the contacts.
2. Press any button 20 times with the battery removed.
3. Always wait at least 10 minutes after removing battery
before re-inserting; otherwise start up problems may
occur.
WWVB RADIO CONTROLLED TIME
The NIST radio station, WWVB, is located in Ft. Collins, Colorado
and transmits the exact time signal continuously throughout the
United States at 60 kHz. The signal can be received up to 2,000
miles away through the internal antenna in the atomic clock.
However, due to the nature of the Earth's Ionosphere, reception is
very limited during daylight hours. The atomic clock will search for a
signal every night when reception is best. The WWVB radio station
derives its signal from the NIST atomic clock in Boulder, Colorado. A
team of atomic physicists continually measures every second of
every day to an accuracy of ten billionths of a second a 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 transmitter.
After 15 minutes the WWVB tower icon in the clock display will start
flashing in the top center of the LCD. This indicates the clock has
detected a radio signal and is trying to receive it. When the time code
is received, the WWVB tower becomes permanently lit and the time
will be displayed.
If the tower icon flashes, but does not set the time or the WWVB
tower does not appear at all, then please take note of the following:
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