Ultralink 325 WWVB Receiver

Microprocessor based WWVB receiver with integrated antenna and real time clock

This Ultralink WWVB receiver is no longer being manufactured. 
Consider our Radio Sync Receiver as a replacement

The Ultralink 325  provides accurate time and date information referenced to the United States Atomic Clock Standard. The unit receives VLF (very low frequency) radio signals broadcast by WWVB operated by the National Institute of Standards and Technology (NIST).

The receiver incorporates a high quality ferrite loop stick antenna, factory tuned for maximum sensitivity and selectivity. The receiver uses base band amplification with crystal band pass filtering. A demodulator provides a digital output corresponding to received signal data.

A microcomputer processes WWVB signals, maintains an accurate real time clock and hosts the serial communication interface. Received data is correlated over time to set an internal real-time clock (RTC). The RTC is driven by a precision quartz crystal for continuous accurate time reference. Power circuitry provides internal operating voltages and maintenance.

  • Receiver Location
    The antenna/receiver unit is designed to be used indoors in a wood frame structure.
  • Operation deep inside metal buildings or buildings with metal reinforcements may be marginal.
  • The antenna/receiver should be mounted with the long side horizontal. It may be mounted flat (table/ shelf) or vertical (wall mounted).
  • The antenna/receiver is directional with best reception obtained with the long side perpendicular to Fort Collins, Colorado.
  • Orient the antenna/receiver for steady blinking of the power/signal LED. After final orientation secure receiver to prevent inadvertent movement (double sticky tape is OK).
  • Avoid locating near suspected interference sources such as:
    • Lamp dimmers Fluorescent lamps Electronic igniters CRT monitors Battery chargers Switching power supplies Motors Automobile ignition systems Power lines Nearby radio transmitters

In some areas of the country the signal may not be available 24 hours a day. In these cases setup and initial reception are usually best done at night. The unit is designed to keep accurate time during marginal reception periods after time is initially acquired.

The Ultralink 325 comes with a  25 foot interface cable, with a DB9 serial data connector.


For more information

Radio Sync Product Information:
  Advanced Features
  Frequently Asked Questions about radio broadcast time syncing
  How does it work?
  Radio Sync WWVB Receiver
     Installation Information

   Radio Sync Site Index
   Radio Sync Main Page


  | Search
Copyright 2007 Beagle Software. All rights reserved
Last reviewed March 19, 2008