What are the best radio settings to make these two receivers work together. I can get the topcon to receive the radio signal from the T3, but it seems very weak. The signal strength jumps around from 30% to 70% and it seems to drop out entirely and then come back. I also have an external arwest radio for the T3 that does the same thing. Its works great when I make the topcon a base using the external radio and the T3 as a rover.