14.3. Signal Flowchart in the Whole SystemReceptionCN101 of the base unit is connected to the TEL line, and signal is entered through the bridge diode D101. While talking, therelay (Q104) is turned ON and amplified at the Q150, then led to DSP (IC501). The DSP encodes ADPCM and TDD/TDMA withFHSS to TX-DATA. The TX-DATA signal is entered to IC901 of RF UNIT, and modulated to 2.4GHz. The RF signal is fed intoTx/Rx switch (D904). The RF signal is passed through filter (FL901) and fed to ANTENNA.As for the handset, RF signal from the antenna passes through filter (FL901), then is routed by Tx/Rx switch (D904) and led toIC901. The RF signal is amplified by LNA and down-converted to IF signal in IC901. The IF signal passing through internal filteris demodulated into RX-DATA, then enters DSP (IC201). The DSP performs TDD/TDMA and ADPCM decoding to convert theRX-DATA into the voice signal, then it is output to the speaker.TransmissionThe voice signal entering from the microphone is led to DSP (IC201). The DSP encodes ADPCM and TDD/TDMA with FHSSto TX-DATA. The TX-DATA signal enters IC901 of RF UNIT, and is modulated to 2.4GHz. The RF signal is fed into Tx/Rx switch(D904). The RF signal is passed through filter (FL901) and fed to ANTENNA.As for the base unit, RF signal from the antenna passes through filter (FL901), then is routed by Tx/Rx switch (D904) and ledto IC901. The RF signal is amplified by LNA and down-converted to IF signal in IC901. The IF signal passing through internalfilter is demodulated into, then enters DSP (IC201). The DSP performs TDD/TDMA and ADPCM decoding to convert the RX-DATA into the voice signal. The voice signal is amplified at the TX amplifier (Q161), then output to the TEL line CN101 throughthe relay (Q104) and bridge (D101).73KX-TG2359BXB
