ClockWatch Radio Sync
WWVB Receiver

Radio Sync works with a WWVB receiver that receives the low frequency (60Khz) broadcast by the NIST in Boulder, CO. The receiver is capable of locking into the broadcast to provide date and time traceable back to the US Atomic Clock.

The microprocessor based receiver receives and decodes the WWVB broadcast signal. The software maintains the PC at the exact time. The receiver is externally mounted to the PC and attaches to a serial port. 

Receiver Location
 

Proper receiver placement is crucial for optimal operation. Locate the receiver indoors away from large metal structures which can degrade receiver operation.  Metal in building structures will shield the antenna from the signal.  Usually installation near an outside wall or window is generally preferred. Mount the receiver where it will not be disturbed; height is not critical, but install away from local RF noise sources and nearby metal objects that will detune and degrade the receiver performance.
 

Receiver Coverage

WWVB radio-controlled clocks should be able to work in most places in North America.  In some areas of the country the signal may not be available 24 hours a day. Refer to NISTs coverage maps for specific coverage details.  The reception area is largest at night, and smallest in the daytime. It is possible that the receiver may not receive a fully validated time signal at all time.   The software is designed to constantly  monitor receiver operation and fully validates all time settings.

Radio Sync includes interface cable, with a DB9 serial data connector.