Low noise and distortion adapter and system for providing audio output signals from the auxiliary SDARS radio to the in-vehicle AM/FM radio

摘要

the present invention is a secondary satellite digital audio radio service receiver and the instrument panel in a vehicle with a AM / FM radio between the adapter relates to, in the adapter for providing an audio signal to the car stereo playback device through the AM / FM radio receiver attached to the instrument panel from the secondary radio SDARS, adapter audio input for receiving the audio signal from the auxiliary SDARS radio; RF output adapter cable for connection with the AM / FM radio antenna input; RF antenna input adapter cable for connection to the vehicle AM / FM antennas; Built-in antenna; Low-power RF amplifiers loaded in the built-in antenna; RF modulator for modulating an RF signal by the audio signal from the audio input adapter; The RF power amplifier of claim 1 RF switch or an input to control the user interface to connect the RF modulator output a RF output to the adapter unit; And it is characterized by a configuration comprising a second RF switch for controlling the user interface to the adapter connecting the RF outputs to the antenna the RF input or the RF modulator output.