RF Micro Devices (RFMD) joins a growing list (I, II, III) of communications chipmakers to issue a calendar Q4 warning. The company now expects revenue of $225M, below a consensus of $250.2M, and expects its gross margin to decline 900 bps Q/Q. RF Micro blames weak sales of chips for 2G devices to Chinese customers, as well as broad weakness in non-mobile chip sales. Shares -12.4% AH.