8
KX-TG4771B/KX-TG4772B/KX-TG4773B/KX-TGA470B
4.1.3.
Signal Flowchart in the Radio Parts
Reception
Base unit:
A voice signal from TEL line is encoded to digital data and converted into a 1.9 GHz modulated radio signal by BBIC(IC501).
The RF signal, after which is amplified in BBIC, is fed to selected antenna.
Portable:
As for a portable RF, RF signal is received in one antenna.
BBIC down-converts to 864 kHz IF signal from RX signal and demodulates it to digital data "RXDATA".
BBIC (IC1) converts RXDATA into a voice signal and outputs it to speaker.
Transmission
Portable:
A voice signal from microphone is encoded to digital data and converted into a 1.9 GHz modulated radio signal by BBIC(IC1).
The RF signal, after which is amplified in BBIC, is fed to an antenna.
Base unit:
As for a base unit RF, RF signal is received in two antennas.
BBIC (IC501) compares RF signal levels and selects the antenna to be used. Then BBIC down-converts to 864 kHz IF signal
from RX signal in the selected antenna, and demodulates it to digital data "RXDATA".
BBIC (IC501) converts RXDATA into a voice signal and outputs it to TEL line.
Содержание KX-TG4771B
Страница 65: ...65 KX TG4771B KX TG4772B KX TG4773B KX TGA470B Memo ...
Страница 72: ...72 KX TG4771B KX TG4772B KX TG4773B KX TGA470B 14 6 Portable LED LED KX TGA470 SCHEMATIC DIAGRAM Handset LED ...
Страница 74: ...74 KX TG4771B KX TG4772B KX TG4773B KX TGA470B Memo ...
Страница 80: ...80 KX TG4771B KX TG4772B KX TG4773B KX TGA470B Memo ...