The passive UHF antenna cables connect to the antenna ports on the back of the decoder and are used to detect the RACE RESULT passive transponders/tags. Compared to the active transponders, the passive tags are far less expensive but have less precision and need to be attached (to the race bib, or to an athlete’s ankle, shoe or bicycle) in a certain way for reliable detection.
Antenna Types
RACE RESULT offers two types of antennas for use with passive tags: the ground antenna, used for almost any type of race (running, triathlon, mountain bike, etc.) or the side antennas (available in high gain linear or circular polarizations), which can be used for a flat finish line to avoid the slightly raised profile of the ground antenna or for special applications such as canoe races, skateboard races, etc. Note that the side antennas have two major disadvantages:
- When several athletes pass the timing line they may block the signal from the antenna as the signal does not go through the human body. In other words, the side antenna should only be used for low-density split timing points.
- Since the antenna field is horizontal and does not have a defined end, tags close to the timing line can be detected easily. That is why the side antennas are not recommended for finish line scenarios when athletes can stand close to the system.
As a consequence, the ground antenna is always recommended where possible and side antennas should only be used when necessary.
Note: side antennas may not be available for sale in all regions.