Transceiver (Rf) Section; Figure 9-4. Uhf Transceiver (Rf) Board Overall Circuit Schematic - Motorola ASTRO XTSTM 4000 Detailed Service Manual

Schematics, Board Overlays, and Parts Lists – UHF: Transceiver (RF) Section
9.4

Transceiver (RF) Section

XCVR_SWB+
RAWB+
FUB+
VSW1
TXTD
TXCK
TXFS
LOCK
F168
RSTL
MOSI
SPCK
USEL
ABCS
RXCK
RXFS
RXDO
6871620L01-C
XB+
E5
BK1005HM471
4
8
6
1
C12 C11
10uF
0.10uF
C13
.01uF
2.2 uF min.
TXH
V5A V3A
V5A
V3A
XB+ VSW1 FUB+ RAWB+
SCEN
TXTD
SSTD
TXCK
SSCK
TXFS
SSFS
LOCK
LOCK
MOSI
DATA
SPCK
CLK
A200, A300
USEL
CSX
MOSI
SPCK
USEL
V5A V3D
C1719
V5A
100pF
V3D
SPCK
PC
MOSI
PD
ABCS
PE
RXCK
CLKOUT
RXFS
ADC
FS
RXDO
DOUTA
A500
D1
MBRM140T3
U1
V5A
LP2989
LP2989IMMX-5.0
5
INPUT OUTPUT
7
SHUTDOWN ERROR
SENSE
2
C14 C10
R1709
BYPASS NC NC
10uF 100pF
100K
RAWB+ XB+ V5A
RAWB+
FGU
XB+
V5A
TXRF TXRF
NC TXINH
RSTL
RXLO MOSI
SPCK
USEL
F168
V5R
FREF V5R
LO
CKO
RXIF RXIF
RXIF
RX_BE
D3
MBRM140T3
VSW1_filtered
3
VEN
1
VIN VOUT
4
BYPASS
C25
1.0uF
U3
LP3985
C26
.01uF
D2
MBRM140T3
V5R VSW1
L10
100uH
3
VEN
1
VIN VOUT
Q4 4
BYPASS
NTR1P02T1
C30 C15
10uF 1.0uF
U2
LP3985
C16
.01uF
R1708
100K
TXH
V5A
V5A
TX_ALC
POUT
TXRF
RXRF
SW_FL
TX5V TX5V
A100
VAR2
A700
VAR3 VAR3
RXLO
LOIN
DAC2
RX_FE
A400
RXIN

Figure 9-4. UHF Transceiver (RF) Board Overall Circuit Schematic

9-5
V3A
5
C27 C28
1.0uF 100pF
V3D
5
C17 C9
1.0uF 100pF
ANT ANT
May 28, 2008