Clock Movements - Time Control Options
An exposed antenna picks up a signal from a satellite for an absolutely accurate time-base. The antenna can be built-in/on the clock or remotely located, but it must be exposed to the sky. Clocks built with a GPS option will reset automatically for Daylight Saving, or for power interruptions. Clocks are set at the factory and when turned on at the jobsite they will reset to the correct time automatically.
Commonly referred to as “Atomic Time” the master clock picks up a WWVB signal from Fort Collins, CO to maintain proper time. The clock will automatically reset for power outages and Daylight Saving. For best reception, any internal illumination must be off between the hours of 0200 and 0400. Clocks are set at the factory and when turned on at the jobsite they will reset to the correct time automatically.
To set and adjust the time, it requires an accessible three-position switch mounted in a single handy box, hard-wired to the clock, to control the movement. Run, Fast, Stop. For any power interruptions or Daylight Saving, it must be manually activated and operated to set the proper time. Most often, the cost increase of an automatic master clock will offset the initial cost of wiring.
For clocks smaller than 48”, quartz time-base master clocks are available, mains-powered or 10 year lithium battery powered. These are usually accurate to within a couple minutes per year. Small reset switches are located on or near the clock. These are only available for clocks with covered dials as the hands are too lightweight for exposed outdoor use.