Antenna of the reader is usually buried underground. Transponder's radio signal is strong enough to penetrate the soil. Antenna is then connected to the reader unit which is again connected to the timekeeping computer.
In passive technology tags or transponders are not rechargeable. In fact there is no battery at all in the tag. Tag gains it's power from the receiving unit which is called a reader. While the tag passes a reader field, it is powered up. After powering up it sends radio signal back to the reader.
Antenna of the reader needs to be overground, at top of, or at the side of a track. This is because radio signal from the passive tag is too weak to penetrate the soil. Antenna is then connected to the reader unit which is again connected to the timekeeping computer.
Speed and costs
|Active transponder||Passive tag|
|Maximum speed||260 km/h||160 km/h|
|Battery life||Several days||Forever|
|Cost per. tag||$$$||0.$|
|Cost per. reader||$$$$||$$$|
(at max. speed)
|0.001 sec||0.05 sec|
Which one is the best for us?
Keep in mind your needs. Is your sport fast or slow? Does a participant count rise over 200? Are conditions harsh, maybe wet and muddy?
For athletic sports like marathon, triathlon, or bicycling we would strongly recommend passive technology. For fast motorsports we would suggest active technology. Something between, the choice is yours.
Don't hesitate to contact our sales and ask for J2Chrono software!
To order hardware please contact manufacturer resellers.
Enymind Oy does not resell hardware directly to end-customers.
SMARTRAC and DogBone are registered trademarks of ©SMARTRAC N.V.