Ok...I am new at this ...I have a 25 watt mobile unit in my vehicle with proper antenna attached. I am in an area where a great repeater is available. However, when within only a 5 or 6 mile distance from that repeater I can only receive a short signal burst from others who are on the same freq/code. I think thy can receive me ok because they attempt to respond. But, as I say the response is only a short signal burst and no voice. I am well within that repeaters range....proper repeater channel and codes set accordingly. What is going on? Why can I not hear the voice response?