How about the Volunteer Association of GPS Backup for Timing, VAGBT ? Propose of the group is to provide backup distribution of timing information for GPS users, via armature radio and cesium clocks. To develop many local transmit stations as possible and low cost receivers with both extended holdover and comparison to GPS to measure backup accuracy. Many low power transmitters would be required as the cost of continuous operation would be lower for each station, and the identification of less accurate stations possible if several in each location was avabile.
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