Larry,
I've tried my own PTX's at 2 local tracks with the AMBrc decoder... both using AutoScore. My own micro track there are about 8 PTX's (mine is the only clone)... this is an AMBrc3 system running AutoScore. And there is another local track using an rc3 decoder... it could be a MyLaps...running rcscoringpro... probably more then 15 there... none of us are having problems.

How was the transponder mounted? I've seen them mounted every way... but AMB, MRT, and MyLaps all recommend them laying flat.

Myself,.. I keep a 4 cell holder handy. If anybody asks they can plug in and run just the pt over the loop... eliminates every thing else.