hat
15 laW televizyon transmetè nan konpoze ak twa pati, yon inite batman, yon anplifikatè pouvwa inite (PA) ak yon ekipman pou pouvwa oblije chanje. Nan inite a batman, siyal videyo yo ajiste nan pwofondè an batman apwopriye atravè yon potansyomètr ajisteman nivo ak Lè sa a sere pa yon dyòd a jonksyon. Siyal yo odyo yo voye nan yon osilator FM pou frekans modulation apre yo fin devyasyon frekans li yo ajiste pa potansyomètr a nivo. Osilator a FM anplwaye yon osilator LC ak generates6.5MHz siyal FM pa yon dyòd a jonksyon capacité varyab. Se frekans lan nan osilator a kristal miltipliye jenere te vle konpayi asirans la vizyèl. 6.5MHz FM siyal ak siyal videyo Module konpayi asirans la vizyèl ansanm. Yon filtè band yo pral met deyò konpozan vle ak siyal yo pral voye nan inite a PA pa yon anplifikatè bande.
eng
The 15W TV transmitter is composed of three parts, a modulation unit, a power amplifier (PA) unit and a switching power supply. In the modulation unit, video signals are adjusted to the suitable modulation depth via a level adjusting potentiometer and then clamped by a diode. The audio signals are sent to a FM oscillator for frequency modulating after its frequency deviation is adjusted by the level potentiometer. The FM oscillator employs a LC oscillator and generates6.5MHz FM signal by a variable capacitance diode. The frequency of the crystal oscillator is multiplied to generate the wanted visual carrier. 6.5MHz FM signal and video signal modulate the visual carrier simultaneously. A bandpass filter will filter out unwanted components and the signals will be sent to the PA unit by a broadband amplifier.