I need a new 2 person portable intercom for my cub. The one that came with the plane is a Flightcom IIsx. It doesn't work very well. The intercom side works sometimes and doesn't other times -- I can't activate the mike to transmit over the radio (I can transmit by talking into the radio itself--but can't use the headset mike unless I plug it direct into radio.) I need a new intercom -- recommendations? Thanks Ron