User's Manual

SRM9000X8 800MHz SERVICE MANUAL
© TMC Radio 2008 page 22 TNM-M-E-0022 Issue 1
Antenna
Switch
D581/
582/D583
Bandpass
Filter
Z400
RF Amp
Q404
Bandpass
Filter
Mixer
U441
IF Amp
Q461
4-Pole
45 MHz
Filters
Z471A/B
Antenna
Filter
L592,L593
& L594
IQ
Demodulator
U481
TX/RX Switch
D641/
D642
RX VCO
Q623
VCO
Buffer
Q631/
Q632
Synthesiser
Buffer
Q640
90 MHz
VCO
Q730
RX/TX
AF
Switch
U801C
CODEC
U800
Tx/Disc
AF
Switch
U801B
Speaker
Switch
Q810/
811/Q813
Speaker
Amp
U805
AF Amp
U803B
VCO Control Volts
To TX Mixer
FINIF
to U721
QI
From PLA/DSP
TX Mod Out To TX VCO
SPKR_ON
SPKR_OUT 1 SPKR_OUT 2
From PLA
TUNE_1 & 2
To TX PA
Tx Audio
from PLA U300
from U721
CPIF
Aux Gain
Switch
U806A
AF Amp
U803A
Rx Audio
Mode 2
U302C
Rx Audio
Mode1
U806C
G
A
I
N
De-
emphasis
Network
Rx Audio
Gate
U302B
Rx Audio
Mode3 U806B
A
U
D
I
O
_
O
U
T
3
(
O
p
t
i
o
n
A
u
d
i
o
)
A
U
D
I
O
_
O
U
T
1
(
O
p
t
i
o
n
A
u
d
i
o
)
A
U
D
I
O
_
O
U
T
2
(
H
/
S
A
u
d
i
o
)
E
N
1
E
N
2
.
.
E
N
3
Q
I
Synthesiser
U721
R
X
_
P
S
U
E
N
4
AF Amp
U802A
C
P
P
T
X
_
M
O
D
A
G
C
T
X
_
M
O
D
E
f
r
o
m
P
L
A
U
3
0
0
D
A
T
A
_
E
N
Differential
Amp
U491
Figure 3-1 Receiver Block Diagram