RF Sniffer
People often comment that things were simpler in the "good old days." This is certainly true of our modern RC transmitters. Not too many years ago, all of our transmitters utilized AM (Amplitude Modulation) and did not provide all the bells-and-whistles we now take for granted. Most of the new radio systems now have transmitters that employ FM (Frequency Modulation) and offer many features. This includes systems called FM, PCM, and PPM. I think we would all agree that while they are not as simple as the older systems, they are much better. A number of years ago a circuit was published for an RF sniffer (by George Steiner, I believe) that was basically a diode detector circuit with its output applied to the input of a Radio Shack audio amplifier. When this combination was placed near an operating RC transmitter, the speaker would emit a loud buzz.
