Wwvb Radio Controlled Time; Moon Phase - La Crosse Technology WS-8248 Instruction Manual

4. Press and release the + key a fourth time. The display will now return to the normal display mode,
indoor humidity, indoor temperature and outdoor temperature.

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.
Once the outdoor temperature is displayed on the atomic clock, the WWVB tower icon in the clock
display will start flashing in the top center of the LCD. This indicates that 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:
• Recommended distance to any interfering sources like computer monitors or TV sets is a
minimum of 6 feet (2 meters).
• Within ferro-concrete rooms (basements, superstructures), the received signal is naturally
weakened. In extreme cases, please place the unit close to a window and/ or point its front or back
towards the Fort Collins, Colorado, transmitter.
• During nighttime, the atmospheric disturbances are usually less severe and reception is possible
in most cases. A single daily reception is adequate to keep the accuracy deviation below 1
second.
Note:
In case the atomic clock is not able to detect the WWVB-signal (disturbances, transmitting distance,
etc.), the time can be manually set (please refer to notes on Manual time setting).

MOON PHASE

The moon phases appear in the middle of the lower LCD. There are 12 visible Moon Phases that will
show in the LCD:
MOON PHASES FOR THE WS-8248
New Moon Small Waxing Large Waxing First Quarter
Crescent Crescent
Full Moon Large Waning Small Waning
Gibbous Gibbous
POSITIONING
Before permanently mounting ensure that the atomic clock is able to receive WWVB signals from the
desired location. Also, extreme and sudden changes in temperature will decrease the accuracy of the
atomic clock, and changes in elevation will result with inaccurate temperatures readings for the next
12 to 24 hours. These changes will require a 12 to 24 hour wait before obtaining reliable data.
Small Waxing Large Waxing
Gibbous Gibbous
Last Quarter Large Waning Small Waning
Crescent Crescent