La Crosse Technology WS-7097 - Manual (Page 6)

The time base for radio controlled time and date is a operated by the NIST radio station WWVB in Ft. Collins, Colorado.
WWVB broadcasts are used by millions of people throughout the United States to synchronize electronic products like
clocks, clock radios and wristwatches. WWVB continuously broadcasts time and frequenzy signals at 60kHz and the
time information received and displayed is absolutely accurate regardless of summer or wintertime.
Software Operations
• WWVB Time Signal
Every full hour, after every setup or reset and after leaving the programming mode the software of the World Time
Center will start a reception of the WWVB time signal.
• Indoor Temperature and Humidity/Air Pressure
The software of the World Time Center will perform measurements of the current indoor temperature every 20
seconds, the current indoor humidity every 1 minute and the current air pressure every 1 minute. In programming
mode and while any one key is pressed no WWVB reception will take place.
Battery •
After setup, reset or after every outdoor data reception a low-battery detection is started by the software of the
World Time Center. If the batteries run low, a low battery indication flag is shown on the display.
Weather Symbols
For every sudden or definite change in air pressure, the weather symbols will update accordingly to represent this
change. This means that the icons will not change if there is no noticable movement in the weather. If the symbols do not
change it simply means that either
1) the weather has not changed or
2) the weather change has been so slow that is has not been possible to read when the actual change had taken
place.
The weather icons displayed forecast the future weather in terms of getting better or worse and not necessarily sunny or
rainy as each icon indicates. E.g., if the current weather is cloudy and the rain icon is displayed, it does not mean that
the product is faulty because it is not raining. It simply means that the air pressure has dropped and the weather is
expected to get worse but not necessarily raining.
Weather Tendency
Because of the combination of weather icons and weather tendency arrows, the World Time Center can also show how
the weather has changed and is expected to change. E.g., if the tendency arrow pointing downwards is displayed along
with the cloud and sun symbols then the last noticeable change in the weather was when it was sunny (sun icon only).
This means that the next change in weather will show the rainy icon since the tendency indicator is pointing downwards..
The weather tendency indicator arrow will remain on the LCD regardless of the weather. E.g., if the current weather is
raining and the indicator is pointing downwards, it means that the weather will remain poor. If the weather is sunny and
the indicator is pointing upwards, it means that the weather is expected to continue being fine.
World Time Center
Operating Manual
Mountain Time
(-7h GMT)
Canada