SOUTHERN AVIONICS COMPANY
Model SA100 Dual2-56 Theory of Operation, Radiobeacon
Figure 2-40. SA Exciter Control Motherboard Schematic
ATK2
GND
AUDM
GND
ATK2ATK2
TSL
+12V
TSLTSL
KET1
KET1
KET1
+12V
RST
RST
SDO1 SDO1 SDO1
RSTRST
+5V
RST
SDO
RST
AUD2
GND
AUD2AUD2
GND
ATK1ATK1ATK1
INTEL1
+12V
GND
MOD
INTEL2
KET2
GND
AUD3
CODE TRAIN CODE TRAIN
LOAD/SHIFT
CLOCK
SDO2
MON MON MON MON
KMC
XSDI
+12V
+5V +5V
SQL SQL SQL
GND
MTK
+12V
MTK
CARR OUT
UBAL AUD IN
UBAL AUDIO IN
RFL
UBAL AUDIO IN
SHTDN
RFL
FWD
MOD
MON
XSDI
SDO2
MSD
+12V
CODE TRAIN
RST
+5V
CLOCK
LOAD/SHIFT
+12V
SDO
+5V
AUD2
SQL
MON
GND
GND
GND
+12V
+12V
CODE TRAIN EXT
LOAD/SHIFT
CLOCK
+5V
SDO1
GND
LOAD/SHIFT
CLOCK
+5V
RST
AUD2
SQL
+12V
CODE TRAIN EXT
GND
GND
+5V
+12V
GND
GND
AUDM
FWD
+12V
KMC
+12V
+12V
SDO1
SHTDN
SDO1
SDO1
AUD2
ATK1
+12V
AUD2
KMC
FWD
RFL
MOD
CARR 1
EXCV
LV OUT
LV IN
CARR 5
CARR 4
CARR 3
CARR 2
CARR OUT
+5V+12V
+12V
+5V
+5V
+5V +5V
NOTES
1. THIS DRAWING NO. SEP40600 REV. A.
2. TITLE: EXCITER MOTHERBOARD PCB SCHEMATIC.
3. ASSEMBLY DWG. NO. SAP40600.
4. ALL RESISTORS 1/4W, UNLESS NOTED.
5. ALL CAPACITORS IN uF, UNLESS NOTED.
INTEL TO RFMB
AUDIO INPUT
KEY
* JP1 NOT USED WITH UK SERIES
MONITOR PCB ( SLP40700)
* C8 USED ONLY WITH
UNBALANCED AUDIO
INPUT - FACTORY SELECT
* JP3 USED WITH AUDIO OPTION
33
9 8
U2DU2D
TP2TP2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
XA7
MONITOR
XA7
MONITOR
+
C6
6.8
+
C6
6.8
R4
10K
R4
10K
TP1TP1
R5
680
R5
680
55 11
1 2
147
U2A
1U740600
U2A
1U740600
TP5TP5
1
2
3
4
5
6
7
8
9
TB2TB2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
XA4
CODE SHIFT REGISTER
XA4
CODE SHIFT REGISTER
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
E1E1
+
C5
33
+
C5
33
11 10
U2EU2E
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
XA1
SYNTHESIZER
XA1
SYNTHESIZER
C7
0.01
C7
0.01
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
TB1TB1
22
A1A8CRA1A8CR
+
C2
6.8
+
C2
6.8
R1
39K
R1
39K
JP3JP3
Q1
1T372500
Q1
1T372500
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
E3E3
TP6TP6
TP4TP4
13 12
U2FU2F
C9
0.1
C9
0.1
R3
100K
R3
100K
+
C8
*
+
C8
*
5 6
U2CU2C
44
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
J1J1
3 4
U2BU2B
+
C3
6.8
+
C3
6.8
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
XA6
AUDIO
XA6
AUDIO
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
XA2
TONE KEY
XA2
TONE KEY
R6
1K
R6
1K
IN
1
OUT
3
GND
2
U1
1U780500
U1
1U780500
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
XA5
CODE SHIFT REGISTER
XA5
CODE SHIFT REGISTER
+
C4
33
+
C4
33
C1
0.068
50V
C1
0.068
50V
JP2JP2
TP3TP3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
J2J2
JP1JP1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
E2E2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
XA3
KEYER CODE
XA3
KEYER CODE
Q2
1T372500
Q2
1T372500
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