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Controller Theory of Operation:
TX Audio Circuit
4-3
4.2
TX Audio Circuit
The TX audio circuit consists of MIC/External MIC, LPF, Audio processor IC, and TX Sub-tone
system. For UHF1 and UHF2, refer to Figure 4-2. For VHF, refer to Figure 4-3.
Figure 4-2. TX Audio Circuit (UHF1 and UHF2)
Figure 4-3. TX Audio Circuit (VHF)
VR
1
(H
P
F)
L
imiter
Scramb
l
er/
D
escramb
l
er
Sp
l
atter
SM
F
T
X
/
RX H
P
F
T
XA
1
-6
to
+4.
5
d
B/
1
.
5
d
B
-9.6
to
+3d
B/
0.
2
d
B
Aud
io
Processor
I
C
(AK
2
347)
Tone
IN
(f
rom
CPU
)
VR
5
S
u
b
a
ud
io
Programmab
l
e
L
P
F
pin
4
pin1
7
pin
8
U1
0
2
-6
to
+6d
B/
0.
5
d
B
F
c
=300Hz
VR
2
Pre
-
E
mp
h
asis
Com
-
pressor
D
T
A
1
pin1
9
To
V
C
O &
V
CTC
XO
2
O
r
d
er
L
P
F
(F
c
=300Hz)
U5
0
2
-A
Mo
d.Adj,
6 O
r
d
er
L
P
F
(F
c
=3KHz)
U5
0
1
-A,
B
U5
08
T
X AF A
mp
.
U5
0
2
-
C
4 O
r
d
er
L
P
F
(F
c
=4KHz)
U5
0
1
-
C
,D
Mic
(Aud
io
IN)
F
c
=
2
.
55
KHz
/
3KHz
VR
1
(H
P
F)
L
imiter
Scramb
l
er/
D
escramb
l
er
Sp
l
atter
SM
F
T
X
/
RX H
P
F
T
XA
1
-6
to
+4.
5
d
B/
1
.
5
d
B
-9.6
to
+3d
B/
0.
2
d
B
Aud
io
Processor
I
C
(AK
2
347)
Tone
IN
(f
rom
CPU
)
VR
5
S
u
b
a
ud
io
Programmab
l
e
L
P
F
pin
4
pin1
7
pin
8
U1
0
2
-6
to
+6d
B/
0.
5
d
B
F
c
=300Hz
VR
2
Pre
-
E
mp
h
asis
Com
-
pressor
D
T
A
1
pin1
9
To
V
C
O &
V
CTC
XO
2
O
r
d
er
L
P
F
(F
c
=300Hz)
U5
0
2
-A
6 O
r
d
er
L
P
F
(F
c
=3KHz)
U5
0
1
-A,
B
Mo
d.Adj,
U5
08
T
X AF A
mp
.
U5
0
2
-
C
4 O
r
d
er
L
P
F
(F
c
=4KHz)
U5
0
1
-
C
,D
Mic
(Aud
io
IN)
F
c
=
2
.
55
KHz
/
3KHz
Содержание P100 Series
Страница 1: ...P100 Series Portable Radios Detailed Service Manual ...
Страница 2: ......
Страница 8: ...iv Notes ...
Страница 18: ...xiv List of Tables Notes ...
Страница 22: ...xviii Summary of Printed Circuit Boards and Bands Available Notes ...
Страница 30: ...Notes 2 4 Test Equipment Service Aids and Service Tools Service Aids ...
Страница 54: ...7 4 UHF2 Schematic Diagrams Overlays and Parts Lists Speaker and Microphone Schematic Notes ...
Страница 128: ...7 78 Circuit Board Schematic Diagram and Parts List UHF2 435 480 MHz Notes ...
Страница 150: ...7 100 Circuit Board Schematic Diagram and Parts List UHF2 MDC QCII R TTE 435 470 MHz Notes ...
Страница 166: ...10 4 VHF Schematic Diagrams Overlays and Parts Lists Speaker and Microphone Schematic Notes ...
Страница 192: ...10 26 Circuit Board Schematic Diagram and Parts List VHF 136 174 MHz Notes ...
Страница 218: ...10 52 Circuit Board Schematic Diagram and Parts List VHF 136 174 MHz Notes ...
Страница 242: ...10 76 Circuit Board Schematic Diagram and Parts List VHF MDC QCII R TTE 136 174 MHz Notes ...
Страница 258: ...13 4 UHF1 Schematic Diagrams Overlays and Parts Lists Speaker and Microphone Schematic Notes ...
Страница 261: ...Circuit Board Schematic Diagram and Parts List UHF1 403 447 MHz 13 7 Figure 13 5 Transmitter Schematic Diagram ...
Страница 328: ...13 74 Circuit Board Schematic Diagram and Parts List UHF1 MDC QCII R TTE 403 447 MHz Notes ...
Страница 332: ...A 4 Warranty Service Support and Replacement Parts Further Assistance From Motorola Notes ...
Страница 335: ......