SOUTHERN AVIONICS COMPANY
Model SA100 Dual
2-12
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
14
7
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
4
11
+
-
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
Summary of Contents for SA100
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