I bought a DX2547 to verify that my channel kit will work in it. I checked the voltage to the power supply in the radio. As per other radios I have had that contained a switching power supply, the max voltage available is 13.6. I changed out the resistor that is nearest the VR control. It tested at 3. 2K. I replaced it with a 3.0 k. And that raised it to 14.45. The power output of the radio is greater and so is the modulation.