AT7400
Owner Manual Rev. 2.0 – October 2006-10-23
Section 3 - 3/39
2.GAV4452 – 30W UHF/ATSC Exciter – Block Diagram
+3
2
V
R
EST
AR
TED
RF
O
U
T
3
0
W
UHF
AT
S
C
E
X
CIT
E
R
M
O
D
U
L
E
4455
+1
2V
+5
V
S
U
BO
RDINAT
E
CO
NT
RO
L
UNIT
(S
C
U
)
C
IM
3
297
5
32
R
S
232
32
RS
4
8
5
DA
T
A
IN
–
D
A
TAO
U
T
D
A
TA
O
U
T–
D
A
TAI
N
M
O
DU
LA
T
O
RC
L
O
C
K
M
O
DU
LA
T
O
RE
N
A
B
L
E
M
O
DU
LA
T
O
RR
E
A
D
L
O
C
K
C
LO
C
KAL
AR
M
AL
C
(PO
W
E
R
C
O
N
T
R
O
L)
V
C
O
1
C
O
NT
RO
L
V
C
O
2
CO
NT
RO
L
V
C
O
3
C
O
NT
RO
L
V
C
O
4
CO
NT
RO
L
DI
V
0
DI
V
1
DI
V
2
DI
V
3
DI
V
4
DI
V
5
N
O
IF
AL
AR
M
L
O
CK
DE
TEC
TO
R
AL
AR
M
UHF
UP
CO
N
V
E
R
T
E
R
M
O
D
U
L
E
4453
IO
R
ESET
SEN
D
IO
SEN
D
C
L
O
C
K
IO
UP
DA
T
E
C
LO
C
K
MA
ST
ER
R
ESET
SER
IA
L
D
AT
A
O
U
T
DI
RE
CT
D
IG
IT
A
L
S
Y
NT
HE
S
IZ
E
R
(D
D
S
)
M
O
D
U
LE
4
466
8V
S
B
M
O
DUL
AT
O
R
AN
D
M
A
S
T
E
R
CL
O
C
K
M
O
D
U
L
E
4454
I
I’
Q
Q’
172M
H
z
14
M
H
z
+15V
DI
RE
CT
PO
W
E
R
S
U
P
PL
Y
M
O
D
U
LE
4
456
10A
F
U
S
E
+3
2V
REST
.
+32
V
+32
V
+15V
DIR
.
+15V
SU
PP
L
Y
FA
N
1
6
3
5
2
4
1
ON
/O
FF
SW
IT
C
H
12
PHA
SE
2
OR
NEUT
RA
L
3
PH
ASE1
4
FA
N
2
PH
ASE1
PH
A
SE2
O
RNE
UTR
AL
+5V
+2.5
V
+
32
V
O
U
T
P
UT
CURR
E
N
T
R
E
A
D
IN
G
32
V
O
U
TPU
T
V
O
L
TAG
E
R
EAD
IN
G
PO
W
E
R
S
U
PP
L
Y
R
E
C
O
NNE
CT
IO
N
P
O
W
E
RS
UP
P
L
Y
S
HUT
DO
W
N
EXC
IT
ER
T
E
M
PER
AT
U
R
E
AL
AR
M
+15V
+5
V
R
S
232R
X
RS
2
32
TX
RS
2
32
G
ND
R
S
485B
R
S
485A
SM
PT
E
IN
1
0
M
Hz
RE
F
IN
20
8V
AC
20
8V
M
O
NO
P
HAS
IC
AND
36
0
V
T
R
IP
HAS
IC
E
Q
U
IP
AM
E
N
T
S
:
•
PH
ASE
1:
20
8
V
AC
•N
E
U
TRA
L
20
8V
BI
P
HAS
IC
AND
2
08
V
T
R
IP
HAS
IC
E
Q
UI
P
A
M
E
NT
S
:
•
PH
ASE
1
/
PH
AS
E
2:
120
V
AC
-15
V
UHF
A
TSC
CHA
N
N
ELT
V
+1
5V
+1
.2
V
-1
5
V
+3
.3
V
+
5V
+3
2
V
+1
5
V
+5
V
-1
5
V
+3
.3
V
+
12
V
+1
5
V
M
O
D
U
L
E
4470
V
O
LTA
G
E
R
E
G
U
LA
TO
R
S
+5
V
+2
.5
V
+1
.2
V
+3
.3
V
+8
V
+1
2V
+3
2
V
R
EST
AR
TED
RF
O
U
T
3
0
W
UHF
AT
S
C
E
X
CIT
E
R
M
O
D
U
L
E
4455
+1
2V
+5
V
S
U
BO
RDINAT
E
CO
NT
RO
L
UNIT
(S
C
U
)
C
IM
3
297
5
32
R
S
232
32
RS
4
8
5
DA
T
A
IN
–
D
A
TAO
U
T
D
A
TA
O
U
T–
D
A
TAI
N
M
O
DU
LA
T
O
RC
L
O
C
K
M
O
DU
LA
T
O
RE
N
A
B
L
E
M
O
DU
LA
T
O
RR
E
A
D
L
O
C
K
C
LO
C
KAL
AR
M
AL
C
(PO
W
E
R
C
O
N
T
R
O
L)
V
C
O
1
C
O
NT
RO
L
V
C
O
2
CO
NT
RO
L
V
C
O
3
C
O
NT
RO
L
V
C
O
4
CO
NT
RO
L
DI
V
0
DI
V
1
DI
V
2
DI
V
3
DI
V
4
DI
V
5
N
O
IF
AL
AR
M
L
O
CK
DE
TEC
TO
R
AL
AR
M
UHF
UP
CO
N
V
E
R
T
E
R
M
O
D
U
L
E
4453
IO
R
ESET
SEN
D
IO
SEN
D
C
L
O
C
K
IO
UP
DA
T
E
C
LO
C
K
MA
ST
ER
R
ESET
SER
IA
L
D
AT
A
O
U
T
DI
RE
CT
D
IG
IT
A
L
S
Y
NT
HE
S
IZ
E
R
(D
D
S
)
M
O
D
U
LE
4
466
8V
S
B
M
O
DUL
AT
O
R
AN
D
M
A
S
T
E
R
CL
O
C
K
M
O
D
U
L
E
4454
8V
S
B
M
O
DUL
AT
O
R
AN
D
M
A
S
T
E
R
CL
O
C
K
M
O
D
U
L
E
4454
I
I’
Q
Q’
172M
H
z
14
M
H
z
+15V
DI
RE
CT
PO
W
E
R
S
U
P
PL
Y
M
O
D
U
LE
4
456
10A
F
U
S
E
+3
2V
REST
.
+32
V
+32
V
+15V
DIR
.
+15V
SU
PP
L
Y
FA
N
1
6
3
5
2
4
1
ON
/O
FF
SW
IT
C
H
12
PHA
SE
2
OR
NEUT
RA
L
3
PH
ASE1
4
FA
N
2
PH
ASE1
PH
A
SE2
O
RNE
UTR
AL
+5V
+2.5
V
+
32
V
O
U
T
P
UT
CURR
E
N
T
R
E
A
D
IN
G
32
V
O
U
TPU
T
V
O
L
TAG
E
R
EAD
IN
G
PO
W
E
R
S
U
PP
L
Y
R
E
C
O
NNE
CT
IO
N
P
O
W
E
RS
UP
P
L
Y
S
HUT
DO
W
N
EXC
IT
ER
T
E
M
PER
AT
U
R
E
AL
AR
M
+15V
+5
V
R
S
232R
X
RS
2
32
TX
RS
2
32
G
ND
R
S
485B
R
S
485A
SM
PT
E
IN
1
0
M
Hz
RE
F
IN
20
8V
AC
20
8V
M
O
NO
P
HAS
IC
AND
36
0
V
T
R
IP
HAS
IC
E
Q
U
IP
AM
E
N
T
S
:
•
PH
ASE
1:
20
8
V
AC
•N
E
U
TRA
L
20
8V
BI
P
HAS
IC
AND
2
08
V
T
R
IP
HAS
IC
E
Q
UI
P
A
M
E
NT
S
:
•
PH
ASE
1
/
PH
AS
E
2:
120
V
AC
-15
V
UHF
A
TSC
CHA
N
N
ELT
V
+1
5V
+1
.2
V
-1
5
V
+3
.3
V
+
5V
+3
2
V
+1
5
V
+5
V
-1
5
V
+3
.3
V
+
12
V
+
32
V
+1
5
V
+5
V
-1
5
V
+3
.3
V
+
12
V
+1
5
V
M
O
D
U
L
E
4470
V
O
LTA
G
E
R
E
G
U
LA
TO
R
S
+5
V
+2
.5
V
+1
.2
V
+3
.3
V
+8
V
+1
2V
