La Crosse Technology WT-2150A Display Modes, General Information on WWVB Radio Controlled Time

2)Press the ALM1/HOUR key to set the alarm hour.

3)Press the ALM2/MIN key to set the alarm minute.

4)Exit this mode by pressing the SNOOZE bar or waiting for 15 seconds.

Alarm is activated when ((1)) or ((2)) is displayed to the right of the map. To activate/deactivate an alarm, press the ALM1 or ALM2 key briefly.

Display Modes

Your alarm clock can be set to display (underneath the US map) either the seconds, calendar, alarm 1 time, alarm 2 time or indoor temperature.

1)Press the MODE/+ key to change the display function.

2)The display will toggle through the options.

General Information on 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 your alarm clock. However, due to the nature of the Earth’s

Ionosphere, reception is very limited during daylight hours. Your alarm 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. Your Radio Controlled Alarm Clock cannot receive signals from other transmitters in the world (Germany’s DCF 77, Japan’s JG2AS, or England’s MSF-60). Outside the United Sates, the alarm clock will keep time as a precision quartz clock.

Troubleshooting

The Radio Controlled Alarm Clock is designed to be simple to operate yet offer a complete range of features. Some common questions are listed below. Q: I inserted a battery, but the time did not set; what’s wrong?

A:In many areas of the country a signal cannot be received during daylight hours due to the interference of the sun. By leaving the clock alone, a signal will be found during the night and the alarm clock will be set to the