Thanks for the quick replies and good ideas. Unfortunately I have tried all of these, except I have noticed that the c-box pins are depressed. They work with the other system though. I'll fix the pins just to check. We definately have had success with radiolynx set to closed as well. I've used this c-box for 8 years, about 20 meets a year. It does work with the older model, but I'm wondering if I should replace. I'll let you guys know what happens. If you think of anything else, let me know. Thanks again.