Tv-transmitter

Description: This transmitter features two power levels for RF transmission. It offers a low-power mode suitable for wireless video applications in residential or office settings, providing 1-30 mW of output power. This allows for simultaneous monitoring of program material without the need for complex connections. For extended ranges, such as in amateur (ham) TV, security, and surveillance applications, the transmitter can output up to 2 W into a 50-ohm load. The video-link transmitter is compatible with both color and black-and-white video as well as audio inputs from various devices, including VCRs, camcorders, small TV cameras, and microphones. It operates on a nominal 12 V DC power supply and consumes 100 mA in low-power mode and 500 mA in the high-power mode.

The transmitter circuit is designed to accommodate different operational requirements based on the application. The low-power mode is ideal for short-range applications, allowing for flexible placement of video sources and monitoring equipment without extensive wiring. The RF output stage typically employs a power amplifier configured to switch between the two power settings, ensuring efficient operation and minimal heat generation.

For the high-power mode, the transmitter includes a robust heat sink and possibly a fan to manage thermal dissipation, ensuring reliability during prolonged use. The choice of a 50-ohm load is standard in RF applications, which helps to minimize signal reflections and maximize power transfer. The input stage of the transmitter features a video modulator capable of processing both composite video signals and audio inputs, allowing for seamless integration with a variety of input devices.

The power supply circuitry is designed to stabilize the voltage and current requirements, with filtering capacitors to reduce noise and ensure clean power delivery to the RF components. The overall design may include protection features such as overcurrent and thermal shutdown to enhance durability and safety.

In summary, this transmitter is a versatile device that caters to various wireless video transmission needs, with adjustable power levels and compatibility with a range of input sources, making it suitable for both casual and professional applications.This transmitter is capable of two levels of rf power. For low-power wireless video, like in a house or office, where simultaneous monitoring of program material is desirable without cumbersome hookups, 1-30 mW is available. For longer ranges up to several miles, as in amateur (ham) TV, security, and surveillance purposes, 2 W into a 50-0 load is available.

The video-link transmitter accepts color and B/W video, and audio inputs from VCRs, camcorders, small TV cameras, and microphones. The unit runs on a nominall2 Vdc and draws 100 mA in the low power version, or 500 mA in the 2-W version.