User's Manual

AMB i.t. B.V. Installation Manual AMBrc - Rev. 1.1b 8
Speed measurement and split time
For speed measurements two loops have to be installed at an exact distance of 10 m / 33ft
of each other at the fastest point of the track. For split time, the second loop can be
installed at any desired measure point of the track.
Whenever using two loops the
maximum width that can be used is 5 m / 16.5 ft per loop.
Via an AMB coax splitter
and extra coax cable (part numbers 6704 and 6001/6002/6003) the two loops are
connected to the AMBrc decoder. Using two loops will result in a weaker signal for the
connected decoder. If very high noise (interference) levels occur, as may happen at night,
the speed or split-time loop may have to be disconnected.
Loop installation for speed trap setup.
Loop installation for split time setup
As the AMBrc decoder can not distinguish between transponder signals coming from the
finish, speed or split time loop, permanent manual supervision is necessary. For instance,
when a car stops in between the two loops used for the speed trap for longer than the
minimum lap time set in the software, the software will add a lap when the car passes the
second speed loop. The best way to avoid this is to use a decoder for the finish line and a