by Steve Grosekemper on Mon Nov 19, 2007 11:25 am
This is what Ultra Lap had to say:
Hello,
Thanks very much for your interest in our Ultra Lap timing system. Our timers are triggered either by an AIM transmitter or one of our own. As far as we know, Hot Lap transmitters will not trigger our timers at the start/finish line. All of our transmitters come equipped with 3 modes of IR frequency... only two of these modes are used in conjunction with our timers, the third is there merely for expansion purposes should we need to assign another signal to another function. So, if you arrive at the track and find that someone has already placed an Ultra Lap transmitter at the start/finish line, then you can set up your extra transmitter somewhere else along the race track, change the signal to M2 (Split) and record split times with your timers.
The two brands of transmitters/timers should be able to operate on the same track without interfering with one another, provided you keep in mind that no matter what the brand of transmitter, there should never be more than one placed within close proximity of another (2 seconds of ride time is adequate space). When transmitters are placed too close to one another (regardless of brand) then the IR signals can interfere with one another and cause all timers to miss laps. The transmitters trigger the timers by using a cone of IR light that pulses at a certain frequency. The timers recognize the signature of this pulse and it is what causes them to trigger a lap. When the transmitters are too close to one another, these pulses can be crossed and it alters the signature of them, thus causing the timers to miss the start/finish line.
So if you keep these general guidelines in mind, you should have no problem using whatever timer configuration you would like in conjunction with your cars. Thanks again for your interest and please let us know if there is anything else we can do for you. Have a great day!
XT Racing Support
So no Hot lap transmitters won't work but some of our time trialers use the AIM system an should have there transponders out at big tracks. But you are SOL for autocross.