Yes, The QMX can not get power from the USB cable.? It needs a separate power supply.? This is best done for the first time with a current and voltage controlled supply, starting at 6.5 to 7 volts, limited 250ma.? A power cycle is needed whenever the USB cable is disconnected from the PC.? The QMX does not always let the PC know how to connect.
73
Evan
AC9TU