Panasonic KX-TG6381LBB Service Manual

8KX-TG6381LBB/KX-TG6381LBS/KX-TG6382LBB/KX-TGA632LBB/KX-TGA632LBS4.1.3. Signal Flowchart in the Radio PartsReceptionA voice signal from TEL line is encoded to digital data "TXDATA" by DSP (IC501) in a base unit.Then TXDATA goes to RF PART, and it's modulated to 1.9 GHz. The RF signal is amplified and fed to a selected antenna.As for a handset RF, RF signal is received in two antennas.RFIC (IC701) compares RF signal levels and selects the antenna to be used. Then RFIC down-converts to 864 kHz IF signalfrom RX signal in the selected antenna, and demodulates it to digital data "RXDATA".DSP (IC501) converts RXDATA into a voice signal and outputs it to speaker.TransmissionA voice signal from microphone is encoded to digital data "TXDATA" by DSP (IC501) in a handset.Then TXDATA goes to RF PART, and it's modulated to 1.9 GHz. The RF signal is amplified and fed to a selected antenna.As for a base unit RF, RF signal is received in two antennas.RFIC (IC701) compares RF signal levels and selects the antenna to be used. Then RFIC down-converts to 864 kHz IF signalfrom RX signal in the selected antenna, and demodulates it to digital data "RXDATA".DSP (IC501) converts RXDATA into a voice signal and outputs it to TEL line.