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Model: 404-1236 www.lacrossetechnology.com/support Page | 3
Manual WWVB Time Signal Search
For information about WWVB, visit: www.nist.gov/pml/div688/grp40/wwvb.cfm
Manual Signal Search:
The WWVB signal is strongest at night.
• Hold the WAVE button down for 3+ seconds.
• The hands will automatically reset to the 12:00 position, and the movement
will attempt to enforce a signal receipt from Fort Collins, CO.
• If the movement successfully receives the signal, the clock will reset
automatically to the correct time. The enforced signal receipt takes
approximately 3-8 minutes. If the clock still fails to receive the signal while in
the WAVE mode, the clock will automatically leave the WAVE mode.
• Set the clock manually and the movement's micro-CPU will control the time
keeping function.
Internal Synchronization:
Once the clock has set correctly by the radio signal, the clock’s CPU operates
continuously. To ensure accuracy, the clock synchronizes the position of the
second and minute hands to the time calculated by the CPU every day. Second
hand synchronization occurs at 1:30 a.m. and 9:30 a.m. and minute hand
synchronization occurs between 1:50 and 2:01 am every day.
Signal Interference:
In some cases, the signal is affected by weather conditions and electrical
interferences, or the location of the clock itself may result in poor reception. If the
clock has not synchronized to the correct time within a few days of activation, you
may need to move the clock to a different location.
Frequently Asked Questions
Q. How long will the battery last?
A. A good AA alkaline battery will last over 24 months.
Q: Can I wire a control timing circuit to the La Crosse Technology® atomic clock?
A: No, the clock cannot work on a timing circuit. Opening the clock voids the warranty.
Q: Is there a booster antenna to receive the WWVB signal in a difficult location?
A: No, the clock cannot work with a booster antenna. Opening the clock or movement voids
the warranty.
Q: Can I shut off the WWVB signal?
A: No. If you manually set the time, when the clock receives a WWVB signal, that signal
will override the manual set. The WAVE button will temporarily stop a WWVB search, but
will not permanent stop the clock from receiving a WWVB time signal.
Q: Is there a version of analog clock with more than the four continental US times
zones?
A: La Crosse Technology® does not make an analog clock with more than four time zones.
These time zones are P (Pacific Time), M (Mountain Time), C (Central Time), and E
(Eastern Time).