JarpySDR - A Tayloe Detector board for Software Defined Radio. This is a simple SDR frontend using all through-hole components. It requires an off-board square-wave oscillator/clock running at F*4, where F is the radio frequency to be recieved. The design is pin compatible with WA6UFQ's Si570 oscillator card, and provides an I2C pass-through header with which to program the Si570. You don't have to use the Si570 board however. You can clock it with any square-wave source you have handy. The design is derived from the G0NQE Acorn SDR receiver. Links: Si570 oscillator board http://home.roadrunner.com/~wa6ufq/universal_vfo_controller.html G0NQE Acorn SDR http://www.g0nqe.co.uk/projects/g0nqe-acorn_sdr_receiver