Read Panasonic KX-TCA385RU Service Manual online
12
KX-TCA385RU
4.2.11.
RF Circuit
Reception
A digital voice signal from LAN is received as "TX_DATA" (*1) by DMW in a cell station.
Then TX_DATA goes to RF part, and it's modulated to 1.9 GHz RF signal. The RF signal is amplified and fed to a selected
antenna by antenna diversity .
Then TX_DATA goes to RF part, and it's modulated to 1.9 GHz RF signal. The RF signal is amplified and fed to a selected
antenna by antenna diversity .
As for a portable station, RF signal of cell station is received in two antennas.
RFIC(IC1) of portable station compares RF signal levels from cell 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
"RX_DATA".
RFIC(IC1) converts RX_DATA into a voice signal and outputs it to speaker.
RFIC(IC1) of portable station compares RF signal levels from cell 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
"RX_DATA".
RFIC(IC1) converts RX_DATA into a voice signal and outputs it to speaker.
Transmission
A voice signal from microphone is encoded to digital data "TX_DATA" by RFIC(IC1) in a portable station.
TX_DATA goes to RF part, and it's modulated to 1.9 GHz RF signal. The RF signal is amplified and fed to a selected antenna by
antenna diversity.
TX_DATA goes to RF part, and it's modulated to 1.9 GHz RF signal. The RF signal is amplified and fed to a selected antenna by
antenna diversity.
As for a cell station, RF signal is received in two antennas.
RFIC 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
"RX_DATA".
DMW is received RX_DATA (*1) as a voice signal from portable station and outputs it to LAN.
RFIC 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
"RX_DATA".
DMW is received RX_DATA (*1) as a voice signal from portable station and outputs it to LAN.
Note:
(*1) TX_DATA and RX_DATA are bundled to one signal as "RXTXDATA" of DMW in cell station.
VBAT_3.0V
LNA_INN
ANT2
ANT1
RX_SW
TX_SW
BAL_OUT1
BAL_OUT2
GND
LNA_INP
VCC_PA
C19
10u
(1608)
C1 1u
C21 2.2u
(1608)
IC1
22
LOUT
23
PWM0
24
DCINS
25
XOUT
38
TEST
39
RX_SW
40
LNA_INN
GND
26
XIN
27
VDD_APU
28
VBAT_APU
29
VDD_IF
30
VCC_FE_IF
31
VCC_PA
32
BAL_OUT2
33
BAL_OUT1
41
LNA_INP
42
ATST_N
43
ATST_P/EXT_LNA
44
RSTN
45
VCC_VCO
46
ON_OFF
47
ON_OFF_OUT
48
IF_T_DATA
49
IF_MLSE
50
IF_RX1
51
IF_
NPORST
IF_INT_ANA
IF_EN_DA
IF_EN_AD
IF_DATA_DA
IF_DATA_AD
IF_CLK_PLL
IF_CLK_IF
IF_CDC_DIR
IF_CDC_DAT_DA
IF_CDC_DAT_AD
IF_BAT_OK
VDD_ADIF
IF_EN_DA
IF_EN_AD
IF_DATA_DA
IF_DATA_AD
IF_CLK_PLL
IF_CLK_IF
IF_CDC_DIR
IF_CDC_DAT_DA
IF_CDC_DAT_AD
IF_BAT_OK
VDD_ADIF
36
GND_RF
37
ANT2
34
TX_SW
35
ANT1
IF_NARES
C3
1u
C58
0.2p
TO RF BLOCK
TX_RF
RX_RF
TX_RF
TX_RF
RX_RF
RX_RF
GND
C43
NC
C41
5p
ANT_TP2
12
GND
BAL_OUT1
GND
CL1
GND
D50
C31
1.5p
GND
GND
C53
NC
C39
1.5p
GND
GND
VCC_PA
C42
3p
LNA_INN
GND
GND
L30 4.7n
GND
BAL_OUT2
ANT2
GND
RX_SW
L34
5.1n
GND
C50
10p
GND
GND
GND
L35
2.7n
GND
C48
10p
C36
10p
GND
C37
NC
ANT_TP1
12
TX_SW
C52
3p
L38 0
L42 0
ANT1
C45
0.5p
LNA_INP
D51
GND
CL2
GND
GND
C61
NC
C62
NC
GND
GND
AT_JP1
12
AT_JP2
12
C30
1p
C32
1p
C33
1.5p
C34
1.5p
C35
1.5p
C44
100p
C47
5.6n
L31 2.7n
L32
2.2n
L33 33p
L36
33n
L39
10n
C51
0
L40
1p
L43
1n
C49
1n
Antenna diversity
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