went through the exact same thing when i started, spent like two days thinking my radio was broken. it was the tone. once i got that sorted the repeater opened right up. also just as a heads up, some repeaters are pretty quiet during the day and more active in the evenings when people are driving home from work, so dont get discouraged if you get the tone right and still dont hear much, just try again around 5 or 6pm local time.