"Where did all the knobs and sliders go?" It's no wonder that Yamaha's DX7 (and little brother DX9) caused such an upset when they were released in 1983. Gone were all the familiar controls, being ...

This is Part 2 of a three-part series. As discussed in Part 1 and recapped here, modern wireless communications systems (mainly superheterodyne radio transceivers) are now required to deliver higher ...