(2) The local oscillator is used to convert the RF signal from the antenna through the shunt filter component to an intermediate frequency signal. (3) The intermediate frequency amplification is performed with a variable gain amplifier so that the output level remains unchanged in the presence of a propagation fading variation. (4) IF channel filtering. A transmitter sends both audio and video signals over the air waves. Transmitters usually transmit more than one signal (TV channel) at a time. A transmitter modulates both picture and sound into one signal and then send this transmission over a wide range to be received by a receiver (TV set). Dtv Transmitter,Vhf Uhf Tv Transmitter,Terrestrial Tv Transmitter,Tv Channel Transmitter Anshan Yuexing Technology Electronics Co., LTD , https://www.yxhtfmtv.com
It is an electronic device that radiates radio waves that carry a video signal representing moving images, along with a synchronized audio channel, which is received by television receivers ('televisions' or 'TVs') belonging to a public audience, which display the image on a screen.
(1) Radio frequency preamplification is performed using an LNA having a low noise figure .