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4.8.
RF Circuit
RF Transmission
A digital audio signal and control signal from LAN is received by DVF99 (IC100) in a cell station.
Then data goes to RFIC (IC501) through SPI and TDM signal, and it's modulated to 1.9 GHz RF signal. The RF signal is ampli-
fied and fed to a selected antenna by antenna diversity.
RF Reception
As for a cell station, RF signal is received in two antennas.
RFIC(IC501) of cell station compares RF signal levels from portable station and selects the antenna to be used.
RX signal in the selected antenna is amplified and down-converted to 864 kHz IF signal, then demodulated to digital data.
Control signal is output to IC100 on SPI signal, and digital audio signal is output to IC100 on TDM signal.
DVF99 (IC100) receives these data and outputs it to LAN.
Antenna diversity
CN502
L504
1
2
D501
L502
C511
C514
DG
DG
DG
C554
DG
DG
CN501
L505
1
2
D502
L503
C512
C515
DG
DG
DG
DG
C555
DG
4.9.
LED Circuit
D101(Green LED) and D102(Red LED), D104(Blue LED) are controlled by IC100(DVF99).
Q104 is used for constant current circuit.
RF TX
C518
C509
RF RX
C526
R506
DG
C529
L508
C519
C510
L509
C523
C527
R507
C528
DG
DG
DG
DG
RF TX
RF RX
ANT2
L511
RX_SW
LNA_INN
C532
LNA_INP
DG
DG
TX_SW
C538
DG
L510
C535
BAL_OUT1
C530
C533
BAL_OUT2
DG
DG
L512
VCC_PA
C534
C537
C539
DG
DG
DG
ANT1
9
C524
VDD3
92
GPIO14/SPIM_CS
91
GPIO13/SPIM_CLK
90
GPIO12/SPIM_DO
89
R518
GPIO11/SPIM_DI
88
GP10
GPIO10
87
IC501
RTCK
86
TMS
85
TCK
84
TDI
83
TDO
82
DG
003
TDMA_SCLK
Digital Audio signal TX
003
TDMA_FSYNC
003
TDMA_TXD
003
TDMA_RXD
Digital Audio Signal RX
KX-NS0154
Control Signal TX
003
SPI1_CS0
003
SPI1_CLK
003
SPI1_DO
003
SPI1_DI
Control Signal RX
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