UHF RADIO FREQUENCY MODULATOR FOR ENSURING ISOLATION BETWEEN GROUND SIGNAL AND UHF MODULATION CHANNEL

摘要

PURPOSE: A UHF radio frequency modulator is provided to view a desired broadcasting program, enable low power control, and reduce signal loss in case of no power by performing high frequency modulation using UHF channels of 470MHz to 806MHz and ensuring isolation between a ground signal and a UHF modulation channel. CONSTITUTION: A UHF radio frequency modulator that selectively outputs a satellite broadcasting signal and a ground signal to a TV includes an RF input terminal(RFin) connected to a ground antenna(ANT), a modulator(30) receiving serial data(SDA), such as modulated channel information and port switch information, and clock(SCL), modulating a UHF modulation channel corresponding to the modulated channel information to an input audio/video signal(AV1), and providing an output signal selection signal(SSW) depending on the port switch information of the serial data, and an RF output terminal(RFout) connected to the TV, and an output selector(34) selecting one of signals(SRF2) modulated from the modulator to provide the same to the RF output terminal.