Limited TV channels to increase reception circuit

The circuit utilizes two main components: an integrated electronic tuner with AV output, commonly referred to as the tuner, which can receive CATV full channel TV signals and output a video signal (Vttko) along with an audio signal (Audio). The second component is a signal modulator, which is a radio modulation device that modulates the audio and video signals onto a designated TV channel for viewing. The audio and video input ports of the TV do not require an external adjuster and can be directly connected to the sound tuner and video output. The circuit is illustrated in Figure 1-41, designed for S-band selection. An RP component is included for selection purposes. A 7812 three-terminal regulator is employed to generate a +12V voltage supply for the high-frequency head and demodulator.

The circuit described is designed for the reception and modulation of CATV signals, integrating an electronic tuner and a modulator for seamless output to a television. The electronic tuner acts as the primary interface for capturing full-channel CATV signals, processing them into usable audio and video outputs. The audio output is designated as 'Audio', while the video output is labeled 'Vttko'.

The signal modulator plays a crucial role in this setup, as it takes the processed audio and video signals and modulates them onto a specific television channel, enabling the viewer to access additional programming without the need for complex adjustments. The direct connection of the audio and video outputs to the television's input ports simplifies the user experience, allowing for straightforward integration into existing setups.

The circuit schematic, as referenced in Figure 1-41, is tailored for S-band selection, indicating its operational frequency range. The inclusion of an RP component facilitates the selection process, allowing users to choose the desired frequency or channel with ease.

Power management within the circuit is handled by a 7812 three-terminal voltage regulator, which is responsible for supplying a stable +12V output. This voltage is essential for powering the high-frequency head and the demodulator, ensuring that the circuit operates efficiently and reliably. The use of a three-terminal regulator simplifies the power supply design while providing consistent performance across the circuit's components.

Overall, this circuit design exemplifies an effective approach to integrating CATV signal reception and modulation, providing users with a reliable and user-friendly solution for enhanced television viewing experiences. Circuit uses two features: one is the integrated electronic tuner with AV output (commonly known as the tuner) which can be received CATV full channel TV signal into a final vi deo (Vttko) and an audio signal (Audio )} another component is a signal modulator (radio modulation device), it may sound, - video signal is modulated onto a TV channel by the television viewing additional channel program. Opponents audio and video input port of the TV, you can not shoot adjuster, directly connected to the sound tuner, video output.

Circuit shown in Figure 1-41, S-band for the death choice. RP thrown in selection. 7812 three-terminal regulator generates + 12V voltage supply respectively high frequency head and demodulator shot.