Signal Flowchart In The Whole System - Panasonic KX-TG6500BXB Service Manual

15.3. Signal Flowchart in the Whole System

Reception
CN101 of the Base Unit is connected to the TEL line, and signal is enter 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 TXMOD. The TXMOD signal is enter to IC701 of RF PART, and modulated to 2.4GHz. The 2.4GHz signal is up-
converted to 5.8GHz RF signal by IC801. The RF signal is amplified by the power amplifier (IC851) and fed passed through filter
(FL861). The RF signal is fed to Antennas.
As for the Handset, RF signal from the RX antenna is amplified by LNA (Q871). The amplified signal is down-converted to
2.4GHz signal by IC801 and led to IC701. The 2.4GHz is down-converted to IF signal in IC701. The IF signal passing through
internal filter is demodulated into RXDATA, then enter to DSP (IC201). 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 (IC201). The DSP encodes ADPCM and TDD/TDMA with
FHSS to TXMOD. The TXMOD signal is enter to IC701 of RF PART, and modulated to 2.4GHz. The 2.4GHz signal is up-
converted to 5.8GHz RF signal by IC801. The RF signal is amplified by the power amplifier (IC851) and fed passed through filter
(FL861). The RF signal is fed to Antenna.
As for the Base Unit, RF signal from the Antennas is amplified by LNA (Q871). The amplified signal is down-converted to
2.4GHz signal by IC801 and led to IC701. The 2.4GHz is down-converted to IF signal in IC701. The IF signal passing through
internal filter is demodulated into RXDATA, then enter to 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).
89
KX-TG6500BXB / KX-TGA650BXB