Abstract: The subject invention relates to a type of radio computer audio-video transmission device, comprising a transmitter and a receiver, wherein the transmitter includes a 2.4 GHZ transmitting antenna, a UHF receiving antenna, a VGA and A/V output, a computer control output, a power input, a power output, an infrared output and such components, said transmitter serving to convert the computer images appearing on the computer monitor, through various processes, into 2.4 GHZ microwave demodulated signals, and transmit them through 2.4 GHZ transmitting antenna to the receiver; and when the receiving antenna of the 2.4 GHZ receiver receives the signals, the signals are then amplifyd and demodulated into general A/V output and transmitted to the TV; the receiver includes a 2.

Abstract: An electromagnetic wave transmitting and transferring device with high polarization isolation performance is provided which comprises a circular waveguide and a rectangular waveguide. The circular waveguide has a hollow configuration which has an opening at a front end portion and a closed surface at the rear end. The opening of the circular waveguide is provided with a horn. The circular waveguide is provided with a polarizer, a first probe, a metallic post and a closed end surface serving as a conductive back surface, wherein the first probe is perpendicular to the metallic post and each of them are inclined with respect to the polarizer by 45 degrees. The rectangular waveguide is perpendicular to the circular waveguide and the central axis of the rectangular waveguide is in alignment with the first probe. The rectangular waveguide is provided with a second probe and a conductive back surface serving as closed end surface.

Abstract: An A/V signal transmission remote control system including an A/V sender having an EEPROM adapted for storing the content and format of an infrared control signal for controlling an A/V output equipment for example a VCR and a CPU controlled by a UHF (418 Mhz) signal from a system remote controller to fetch data from the EEPROM and to convert the fetched data into an infrared signal for controlling the A/V output equipment, permitting the remote control signal and the A/V signal to be transmitted to an A/V receiver so that the user can enjoy the program sent from the A/V output equipment and simultaneously monitor the control of the system remote controller.

Abstract: A wireless computer picture transmission device including a VGA port, a VGA converter, a video signal compositor, a low pass filter, a first video signal buffer amplifier, a second video signal buffer amplifier, a third video signal buffer amplifier, a transmitter module, a CPU, a synchronous detection circuit, a first switch, a second switch, and an electronic switch, and controlled to process computer signal from a PC into radio signal and to transmit it to a radio receiver at a TV set or projector, so that the user can monitor the data of the computer through the TV set or projector.