The Dow dipped while the S&P 500 edged up on Wednesday as a sharp drop in durable goods orders last month added to worries about slower U.S. economic activity and Apple's results disappointed investors. **BOEING CO, $91.15, up 3.3 pct. **APPLE INC, $401.20, down 1 pct.
March 15- Radio frequency chip makers are set to gain as Samsung Electronics Co Ltd and Apple Inc unveil ever more sophisticated smartphones and tablets to battle for the No. 1 spot in the global mobile devices market.