SOUTHERN AVIONICS COMPANY
Model SA100 Dual2-12 Theory of Operation, Radiobeacon
Figure 2-5. Tone Key Schematic
KET
KMC
ATK2
MTK
SQL
MON
+12V
+12V
+12V
+12V
+12V
+12V
+12V
NOTES:
1. THIS DWG NO. SEP30500 REV. J.
2. TITLE: TONE KEY PCB SCHEMATIC
3. ASSEMBLY DWG NO. SAP30500
4. ALL CAPACITORS IN uF, UNLESS NOTED.
5. ALL RESISTORS 1/4W, UNLESS NOTED.
6. C13, C14, JP5, JP6, R12, R29, U3, AND U4 NOT USED ON SLP30500.
TONE SIGNAL FREQUENCY SELECTION
400Hz
1020Hz
2-3
FILTER
TRIM
FILTER
TRIM
1020Hz
400Hz
JP1 JP2
2-3
2-1 2-1
1020Hz
SET
400Hz
SET
SQUELCH CONTROL
CONTINUOUS TONE SQUELCH
NO EXTERNAL VOICE
2-3
JP3
OPEN
2-1
FUNCTION
TONE SQUELCH WHEN VOICE PRESENT
* +12V INPUT SELECTION
FREQUENCY
R5
4.7K
R5
4.7K
+
C11
33
+
C11
33
R14
10K
R14
10K
R17
68K
R17
68K
10
9
8
+
-
U1C
+
-
U1C
R18
6.8K
R18
6.8K
R27
100K
R27
100K
R9
1.2K
R9
1.2K
3
2
1
JP2JP2
R3
2K
R3
2K
R22
1.2K
R22
1.2K
R1
390K
R1
390K
R6
4.7K
R6
4.7K
R11
22K
R11
22K
C10
0.1
C10
0.1
R15
10K
R15
10K
3
2
1
JP4JP4
R16
10M
R16
10M
+
C7
1.0
+
C7
1.0
3
2
1
JP3JP3
R28
100K
R28
100K
TP2TP2
5
6
7
+
-
U1B
+
-
U1B
R19
6.8K
R19
6.8K
TP1TP1
1 2
147
13
U2A
1U140660
U2A
1U140660
R24
22K
R24
22K
C8
0.082
C8
0.082
R2
2K
R2
2K
C9
0.082
C9
0.082
C4
0.047
C4
0.047
C5
0.01
C5
0.01
R8
5.6K
R8
5.6K
R10
5K
R10
5K
R23
5K
R23
5K
TP0TP0
C1
0.018
C1
0.018
12
13
14
+
-
U1D
+
-
U1D
8 9
6
U2DU2D
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
P1
GOLD FINGERS (22X)
P1
GOLD FINGERS (22X)
R13
100K
R13
100K
C12
0.1
C12
0.1
R20
56K
R20
56K
3
2
1
JP1JP1
C3
0.047
C3
0.047
11 10
12
U2BU2B
R7
39K
R7
39K
3
2
1
411
+
-
U1A
1U324000
+
-
U1A
1U324000
C2
0.018
C2
0.018
R26
100K
R26
100K
R4
47K
R4
47K
R21
8.2K
R21
8.2K
TP3TP3
4 3
5
U2CU2C
+
C6
33
+
C6
33
R25
100K
R25
100K
To Next Page
Loading...