Panasonic KX-TG6071BXM Service Manual page 8

KX-TG6071BXM/KX-TGA601BXM
4.1.3. Signal Flowchart in the Whole System
Reception
CN101 of the base unit is connected to the TEL line, and signal is input through the bridge diode D101. While talking, the relay
(Q141) is turned ON and amplified at the Q171, then led to DSP (IC501). The DSP encodes ADPCM and TDD/TDMA with
FHSS to TXDATA. The TXDATA signal goes into IC701 of RF PART, and is modulated to 5.8 GHz. The RF signal is amplified by
the power amplifier (IC801) and fed to Antennas.
As for the handset, RF signal from the RX antenna is amplified by LNA (IC801). The amplified signal is down-converted to IF
signal in IC701. The IF signal passing through internal filter is demodulated into RXDATA, then goes into DSP (IC501). The DSP
performs TDD/TDMA and ADPCM decoding to convert the RXDATA into the voice signal, then it is output to the speaker.
Transmission
The voice signal entering from the handset microphone is led to DSP (IC501). The DSP encodes ADPCM and TDD/TDMA with
FHSS to TXDATA. The TXDATA signal goes into IC701 of RF PART, and is modulated to 5.8 GHz. The RF signal is amplified by
the power amplifier (IC801) and fed to Antenna.
As for the base unit, RF signal from the Antennas is amplified by LNA (IC801). The amplified signal is down-converted to IF sig-
nal in IC701. The IF signal passing through internal filter is demodulated into RXDATA, then goes into DSP (IC501). The DSP
performs TDD/TDMA and ADPCM decoding to convert the RXDATA 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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