8
KX-TG6440PK/KX-TGA641S/KX-TGA641T/KX-TGA740B
4.1.3.
Signal Flowchart in the Radio Parts
Reception
A 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 signal
from 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.
Transmission
A 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 signal
from 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.
Summary of Contents for KX-TG6440PK
Page 2: ...2 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B ...
Page 28: ...28 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 4 10 Signal Route ...
Page 29: ...29 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B RF part signal route ...
Page 31: ...31 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 5 2 Display ...
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Page 36: ...36 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 7 1 2 Programming using the Direct Commands ...
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Page 38: ...38 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 7 2 Error Messages ...
Page 39: ...39 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 7 3 Troubleshooting ...
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Page 67: ...67 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 11 1 2 Handset ...
Page 68: ...68 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 11 1 3 Charger Unit ...
Page 69: ...69 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B 11 2 How to Replace the Handset LCD ...
Page 89: ...89 KX TG6440PK KX TGA641S KX TGA641T KX TGA740B Memo ...