Transistor Q2 has two jobs: the production and modulation carrier frequency. Pre-amplified audio signal fed to the base of the transistor Q2 to modulation. C5 capacitor and inductor L1 form a tank circuit which is responsible for producing carrier frequency. Video signal is fed to the emitter transistor Q2 through R7 POT for modulation. Which modulated composite signal (audio + video) transmitted by the antenna A1.
Whether the purpose of transmitting TV Make? Different course different, the most important is to effectively cables, usually emitted in the room to receive room without cables. Afiata.com trying to invite you to learn with a TV transmitter uses FM modulation to 1 standard for voice and PAL video modulation. Audio signal to be modulated is pre-amplified by using the transistor Q1 and associated components.