Anybody know of a Radio Shack microphone that will work with the K2. My MH2 is getting reports of being muffled to the point that the audio is not readable. Wondered if I could get an RS Mic as a quick replacement. Not sure if this anything internal to the K2 or the Mic itself. 99% of the time I use the K2 on CW. 73, Dave Lear NE5DL