System

The Wasatch 100 runner tracking system is made up of a packet radio network, with equipment installed specifically in support of the Wasatch 100.

Six packet nodes provide relay of 1200 baud VHF packet traffic from the checkpoints via a 9600 baud UHF backbone to the finish line where the database computer system is located. Each checkpoint has reasonable access to one of the nodes. The Clayton Peak nodes provide the primary radio access for the finish line station and are essential for operation of the system. For this reason, two nodes physically separated by about half a mile are installed to provide redundancy. Each Clayton Peak node connects to the finish line on a separate UHF frequency. The LEWIS node is out of range of the finish line station and relays all traffic via the CLAY1 node.

New for 2010 was the addition of the MDELL node.  This will replace the former MURD node and will operate on the same VHF frequency.  The intent of this node is to better enable those stations at the Lambs Canyon aid station to have a better, more reliable connection to the finish line.  The ISLAND node connects via UHF to an internet gateway in Salt Lake City, then via an internet tunnel to the finish line.  MDELL also connects to the finish line utilizing an internet tunnel but does not make use of the UHF relay station.

The two CLAY nodes are hiked to the top of the mountain above the Brighton ski area on the day before the race begins and are battery powered. All of the nodes are low power running 2 to 3 watts on both the VHF and UHF transmitters. Antennas are dual band fiberglass enclosed collinear.
System software, except for the packet node software in the node TNCs, is located on the system computer at the finish line. Checkpoint packet stations use any terminal software capable of handling ASCII text. The system program consists of a packet engine capable of multiple simultaneous connections coupled with a database management, display, and control program written in Delphi running on a Windows computer. The database is shared with other terminals on a LAN at the finish line which provide display and entry screens for the voice operators, public inquiry screens, and a system that provides web access to the data.