Low audio and no forward swing, can be heard on a close receiver, mic gain makes a difference, variable power works, modulation vr in the radio does nothing, don't know if the limiter was removed, I can't find a schematic, and am new to the surface mount stuff with these radios, am regulator heats up quick, voltages seem right there, driver and final mosfets seem ok, I've tried the obvious stuff, working mic, echo on/off makes no difference, I've went through transmitter alignment up to adjusting modulation.