Schematics, Board Overlays, and Parts Lists – VHF
: Transceiver (RF) Section
8-5
6871620L01-C
May 28, 2008
8.4
Transceiver (RF) Section
Figure 8-4. VHF Transceiver (RF) Board Overall Circuit Schematic
XCVR DC Regulators
E
C
A
F
R
E
T
NI
N
O
C
O
V /
R
V
C
X
1
VIN
5
VOUT
VSW1_filtered
VSW1
LP3985
U3
4
BYPASS
2
D
N
G
3
VEN
C11
0.10uF
VSW1
RAWB+
ANT
RXRF
TX5V
TXRF
V5A
VAR3
R1709
100K
C16
.01uF
XB+
MBRM140T3
D3
NTR1P02T1
Q4
C26
2
NC
5
OUTPUT
6
SENSE
8
SHUTDOWN
NC
.01uF
LP2989
U1
LP2989IMMX-5.0
1
BYPASS
7
ERROR
3
D
N
G
4
INPUT
D2
MBRM140T3
V5A
C13
XB+
USEL
V5A
VAR2
VAR3
XB+
.01uF
MOSI
POUT
RAWB+
RSTL
SPCK
TX5V
TXINH
TXRF
BYPASS
4
D
N
G
2
VEN
3
VIN
1
VOUT
5
U2
LP3985
E5
V3A
V5A
C17
1.0uF
BK1005HM471
1000pF
C9
MBRM140T3
D1
V3D
1000pF
NC
RAWB+
C10
1.0uF
C15
10uF
C30
C12
10uF
1000pF
C1719
2.2 uF min.
XB+
100K
R1708
CLKOUT
DOUTA
FREF
FS
PC
PD
PE
RXIF
V3D
V5A
V5A
C28
1000pF
V3D
V5R
CLK
CSX
DATA
F168
LOCK
RXLO
SCEN
SSCK
SSFS
SSTD
TXRF
V3A
V5A
C25
1.0uF
L10
100uH
DAC2
LOIN
RXIF
RXIN
V5R
C27
V5A
V5R
1.0uF
2
3
4
5
6
5
6
7
8
9
0
1
1
7
8
1
2
1
1
3
4
1
2
3
4
5
6
5
6
1
2
3
4
5
6
6
7
8
1
2
3
4
5
6
1
2
3
4
5
5
6
7
1
2
3
4
4
5
1
2
3
4
5
6
7
8
1
2
3
7
8
9
0
1
1
2
3
4
SH01 SHIELD
(RECEIVER BACK-END)
SH03 SHIELD
(RECEIVER RF PRE-FILTER)
SH05 SHIELD
(FGU (SYNTHESIZER 2))
SH09 SHIELD
(FGU (SYNTHESIZER 1))
SH10 SHIELD
(FGU (VCO))
SH11 SHIELD
(RECEIVER 2ND LO VCO)
SH06 SHIELD
(TRANSMIT PRE-DRIVER STAGE)
SH08 SHIELD
(TRANSMIT POWER STAGE)
SH07 SHIELD
(HARMONIC FILTER &
ANTENNA SWITCH)
SH04 SHIELD
(RECEIVER MIXER & IF FILTER)
SH02 SHIELD
(RECEIVER LOW-NOISE
AMPLIFIER & RF POST FILTER)
1
2
3
4
5
6
V3A
FUB+
10uF
C14
V5A
RXIF
RXLO
RSTL
VSW1
X
LOCK
TXFS
TXFS
TXCK
TXCK
TXTD
TXTD
F168
FUB+
RAWB+
TXH
TXH
RXDO
RXDO
RXFS
RXFS
RXCK
RXCK
ANT
ABCS
ABCS
USEL
USEL
USEL
SPCK
SPCK
SPCK
SPCK
MOSI
MOSI
MOSI
MOSI
LOCK
FGU
A200,A300
RX_BE
A500
LO
CKO
ADC
SW_FL
A700
TX_ALC
RX_FE
A100
A400
Summary of Contents for ASTRO XTSTM 4000
Page 1: ...COLOR CHORDS 7 ASTRO XTSTM 4000 Portable Radio Detailed Service Manual ...
Page 2: ......
Page 16: ...May 28 2008 6871620L01 C xiv Commercial Warranty Notes ...
Page 22: ...May 28 2008 6871620L01 C 1 6 Introduction Notes ...
Page 26: ...May 28 2008 6871620L01 C 2 4 Radio Power Notes ...
Page 56: ...May 28 2008 6871620L01 C 3 30 Theory of Operation Notes ...
Page 100: ...May 28 2008 6871620L01 C 6 8 Troubleshooting Waveforms Notes ...
Page 194: ...May 28 2008 6871620L01 C B 2 Motorola Service Centers Notes ...
Page 204: ...May 28 2008 6871620L01 C Glossary 10 Glossary Notes ...
Page 209: ......