User manual LA CROSSE TECHNOLOGY WT-3181 INSTRUCTION MANUAL

[. . . ] This atomic clock regulates the WWVB radio transmitter located in Fort Collins, Colorado, where the exact time signal is continuously broadcast throughout the United States at 60 kHz to take advantage of stable long wave radio paths found in that frequency range. Radio waves at these low frequencies use the earth and the ionosphere as a wave-guide and follow the curvature of the earth for long distances. The built in antenna system will receive the WWVB signal anywhere in North America within 2000 miles of Fort Collins where long-wave radio reception is undisturbed. A microprocessor activates the receiver and processes the time signal from Fort Collins overnight. [. . . ] WWVB will penetrate almost every residential building and most steel buildings if they have adequate windows. It is not possible, however, for WWVB to penetrate most indoor shopping malls and rooms in the center of large office buildings that do not have windows. In buildings that WWVB cannot penetrate you may set the time using the manual time set button. When the clock receives the WWVB signal it will automatically set the hands to the exact time. La Crosse Technology clocks do not receive or process radio controlled time signals from Germany's DCF 77, Japan's J Ga AS, or England's MSFs atomically regulated transmitters. La Crosse Technology clocks can be manually set and used anywhere. For more information on the NIST and radio controlled time, see www. boulder. nist. gov/timefreq/ SET THE TIME USING THE MANUAL TIME SET BUTTON In some cases, the La Crosse Technology clock may not receive the WWVB signal due to atmospheric disturbances or hard to reach locations such as inside malls. In this case, please use the Manual Time Set button, located at the back of the clock to manually set the time. The minutes and hours hands will fast-forward while the button is held. Keep holding the Manual Set button until the time is set as required. Release the button. Note: The clock will continuously search for WWVB at1:00 am, 3:00 am, 4:00 am, 6:00 am, 12:00 pm, 6:00 pm and 11:00 pm until a signal is received. Once the WWVB time signal is received, the WWVB time will override the manual set time. MANUAL TIME SET BUTTON 4 TEMPERATURE AND HUMIDITY The La Crosse Technology clock has two analog sensors that measure surrounding temperature and humidity. The temperature information is displayed in degrees Fahrenheit and Celsius, and humidity data is displayed in percentage. The thermometer and hygrometer have been calibrated in factory. To check the sensors accuracy, tune to your local weather forecast information broadcast for the latest weather information. It may be necessary to adjust the sensors. To manually adjust the sensors, gently turn the corresponding knobs located at the back of the clock until required data has been reached. Calibration knob for thermometer Calibration knob for hygrometer Humidity display in % Outer ring displays temperature in degree Fahrenheit Inner ring displays temperature in degree Celsius TROUBLESHOOTING The wonderful advantage of owning a La Crosse Technology radio controlled clock is that it is virtually trouble free. If the clock receives a clear signal it will set itself perfectly. If it does not receive a signal consider the following: Battery The La Crosse Technology clock must have a fresh battery to receive and process the time signal. Location - Try a different location, ideally near a window. It should be at least six feet from computers, TVs, air conditioners, other Radio-Controlled clocks and other electrical appliances that cause interference. Weather - Electrical storms between you and Colorado during the night will interfere with the WWVB signal. [. . . ] This handbook must not be reproduced in any form, even in excerpts, or duplicated or processed using electronic, mechanical or chemical procedures without written permission of the publisher. This handbook may contain mistakes and printing errors. The information in this handbook is regularly checked and corrections made in the next issue. We accept no liability for technical mistakes or printing errors, or their consequences. [. . . ]