What is the difference between low and high frequency transponders?
We use low frequency (134khz) transponders and readers which generally are the standard used for sports timing. They offer good read range, read focus of antennas and can penetrate most mediums other than metal. The 134khz system is half duplex meaning that only one transponder can be read at any given time over a antenna mat. However, if transponders are slightly staggered as they cross over the mat, they will both be read in the correct sequence. This is actually an advantage since it means that the correct order of transponders crossing the mat is recorded. Sprint finishes can be easily and accurately separated to 0.1 second resolution. The much more common high frequency transponders tend to be cheaper and full duplex meaning that many transponders can be read at the same time by one antenna. This type of system is favoured for tracking goods in a warehouse (ie. Walmart). This is because the system is cheaper, transponders are expendable and most importantly, all the information th
