A spread sheet with the current assignment of transponders is available HERE. This list will be regularly updated. If you think you have a different number to that listed, please contact your club. Also check what number you have been assigned on the start list each week and if you think it should be different let someone know at sign-in (or before).
The transponders issued over 5 years ago are nearing their end of life where the non-replaceable internal battery dies. The club will gradually replace transponders as they fail at a cost of $100 to the member and these should last another 5 years. If your old transponder is not detected in a race finish (as indicated in the published results), please return it to the club for checking, it may be due for replacement.
The transponders are somewhat sensitive to their placement on the bike. In particular, covering the outside with the velcro fastening strap may affect the functioning. A rule of thumb is to try to maintain a clear line-of-sight between the outside surface of the transponder and the detecting hardware at the finish line. Such things as metal or carbon fibre bike parts can block this. Best orientation of the transponder is vertical (as shown below).
Example of preferred method of attachment:-
TIMING SYSTEM OPERATION
A description of the Timing System Operation is here.