A few months ago I presented you the Easy-phi project, which aims at building a simple, cheap but intelligent rack-based open hardware/software platform for hobbyists. With easy-phi, you simply have a ...
Polar frequency discriminators (PFD) are widely used in radar and direction-finding applications to determine the unknown frequency of incoming pulses. This article explains how to design the RF ...
AM radios were easy to understand. The strength of the signal goes up and down, and the audio follows. FM radio is a little more difficult. [AllAmericanFiveRadio] has an old tube FM set and takes us ...
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