Composition of an amateur radio station
Amateur Radio

Depending on the transmission mode used, the signal source varies. For Morse telegraphy, the handheld, double-contact or electronic manipulator is used. In telephony, a dynamic or piezoelectric microphone is indispensable. Facsimiles use a photoelectric cell to transform luminosity variations. Television uses an image-analyzer tube, whether slow- or fast-scan. The radio teletype is based on a contact wheel. With the rapid evolution of electronics, some of these signal sources have been...