Panasonic KX-TG3611BXB Service Manual page 9

4.1.3. Signal Flowchart in the Whole System
Reception
CN101 of the base unit is connected to the TEL line, and signal is entered through the bridge diode DI01. While talking, the relay
(Q141) is turned ON and amplified at the Q17I, then led to DSP (IC501). The DSP encodes ADPCM and TDD/TDMA with FHSS
to TX-DATA. The TX-DATA signal is entered to IC703 of RF UNIT, and modulated to 2.4 GHz. The RF signal is fed into Tx/Rx
switch (D701). The RF signal is fed to Antenna.
As for the handset, RF signal from the antenna is routed by Tx/Rx switch (D701) and led to IC703. The RF signal is amplified by
LNA and down-converted to IF signal in IC701. The IF signal passing through internal filter is demodulated into RX-DATA. then
enters DSP (IC501). The DSP performs TDD/TDMA and ADPCM decoding to convert the RX-DATA into the voice signal, then it
is output to the speaker.
Transmission
The voice signal entering from the microphone is led to DSP (IC501). The DSP encodes ADPCM and TDD/TDMA with FHSS to
TX-DATA. The TX-DATA signal enters IC703 of RF UNIT, and is modulated to 2.4 GHz. The RF signal is fed into Tx/Rx switch
(D701). The RF signal is fed to Antenna.
As for the base unit. RF signal from the Antenna is routed by Tx/Rx switch (D701) and led to IC703. The RF signal is amplified
by LNA and down-converted to IF signal in IC703. The IF signal passing through internal filter is demodulated, then enters DSP
(IC501). 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 through the relay (Q141) and bridge (D101).
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KX-TG3611BX/KX-TG3612BX/KX-TGA361BX