1
1
2
2
3
3
4
4
5
5
6
6
D
D
C
C
B
B
A
A
.001u
C71
INDUCTOR
L2
51R
R172
.001u
2KV
C169
1
TTC OPTION G
TTC OPTION H
VOICE SCRAMBLER
CON1
100K
R206
LM660
-
+
6
5
7
U18:2
TP17
.1u
C157
.1u
C128
.47u
C175
-
+
2
3
1
4
1
1
U8:1
LM324
.01u
C99
TP8
SPARE
PAD3
18K
R288
100K
R91
-
+
9
10
8
U11:3
LMC6036
SA572
RECT_IN
3
ATK_CAP
4
G_OUT
5
THD_TRIM
6
VCC
16
GND
8
REC_CAP
2
G_IN
7
TRK_TRIM
1
U7:1
300 mA Resettable Fuse
OPTION J
F4
100K
R83
10
10K1%
R177
47p
C77
470R
R133
-
+
13
12
14
U14:4
LM324
51R
R252
10K
R131
33K
R88
100K
R98
-
+
6
5
7
U11:2
LMC6036
10K
R96
10K1%
R174
P3100
OPTION C
TZ5
INDUCTOR
L6
.47u
C85
.1u
C121
TP6
1K
R261
2
TP3
*
R218
B25
Q33
22K
R279
P0300
OPTION J
TZ9
1K
RP3
1K
R260
10K1%
R173
-
+
6
5
7
U10:2
LM324
1u
C103
2.2K
R254
*
R298
4.7K
R156
3.3K
R242
LM4950
SHUTDOWN
2
BYPASS
8
GND TAB
5
GND
4
VDD
6
U20:2
.047u
C97
B25
Q22
100K
RP15
1u
C61
100K
R139
15K
R149
0R
R101
4.7K
R128
25
36K
R282
.22u
C113
TP19
*
R297
470K
R142
.47u
C39
.001u
2KV
C165
10K1%
R237
2.2K
R171
10K1%
R166
0R
R189
620R
R151
SA572
RECT_IN
13
ATK_CAP
12
G_OUT
11
THD_TRIM
10
VCC
16
GND
8
REC_CAP
14
G_IN
9
TRK_TRIM
15
U7:2
47K
R144
.22u
C55
9.1K
R73
100K
R284
.47u
C73
1K
R153
10K
R198
RJ11-4
1
2
3
4
BLK
RED
GRN
YEL
POTS
CON4
.1u
C126
.01u NPO
C156
470u
+
C32
TP7
100K
R276
-
+
2
3
1
4
1
1
U14:1
LM324
INDUCTOR
L7
.47u
C162
330K
R125
.1u
C104
INDUCTOR
L1
*
R290
300 mA Resettable Fuse
OPTION C
F6
200K
R275
47K
R99
TP11
3
100p
C114
TP9
INDUCTOR
L5
BSS
Q20
10K1%
R250
10K1%
R247
P0300
TZ4
.047u
C96
47u
+
C51
39K
R273
1
J1
EARTH CHASSIS GROUND
.22u
C88
5K
RP4
*
Q35
10K
RP11
330K
R85
470K
R191
.001u
2KV
C168
10K1%
R248
300 mA Resettable Fuse
OPTION C
F3
56K
R100
1.2M
R188
0R
R281
3.3K
R238
12
*
C64
47K
R148
330K
R126
750K
R192
*
R296
5K
RP10
43K
R121
.1u
C47
.22u
C40
7.5K
R263
10K
R180
-
+
9
10
8
U14:3
LM324
.022u
C59
1.8M
R186
10K1%
R179
47K
R167
4
P0300
OPTION J
TZ8
10K1%
R178
10R
R278
470R
R255
Y25
Q29
100p
C50
0R
R184
TP4
1K
R107
-
+
6
5
7
U12:2
LM324
-
+
6
5
7
LM324
U14:2
-
+
6
5
7
U15:2
LM660
1K
R162
.033u
C171
BSS
Q18
1K
RP6
.001u
C125
-
+
9
10
8
U10:3
LM324
-
+
13
12
14
U8:4
LM324
10K1%
R246
BSS
Q25
1u
C101
1K
R86
TP5
13
10K
R221
1K
R233
.47u
C158
.1u
C177
-
+
2
3
1
4
1
1
U10:1
LM324
1M
RP17
1K
R264
.01u
C75
470K
R280
TP20
.47u
C60
100K
R108
10K1%
R170
*
C100
*
C76
150p
C139
5
.47u
C107
47K
R120
*
R304
1K
R259
SJ13
TP22
P0300
TZ3
100K
R134
TP21
.47u
C106
47K
R145
.001u
C124
1K
R124
6.8K
R95
.1u
C98
300 mA Resettable Fuse
F2
INDUCTOR
L4
300 mA Resettable Fuse
F5
LM4950
-
9
7
U20:3
LM4950
-
1
3
U20:1
1K
RP9
-
+
2
3
1
4
1
1
U11:1
LMC6036
4.7K
R150
-
+
9
10
8
U15:3
LM660
4.7K
R143
26
.001u
C42
-
+
2
3
1
4
1
1
U12:1
LM324
1.2M
R183
*
C179
TP14
.01u
C93
15K
R147
.1u
C127
10K
R89
390K
R187
10K
R97
*
R243
.01u
C176
1.8M
R181
.001u
2KV
C167
100p
C86
10K
R90
330R
R231
JP34
-
+
2
3
1
4
1
1
U15:1
LM660
47K
R76
10K
R72
P3100
OPTION C
TZ7
10K1%
R165
TP18
6
BSS
Q27
-
+
13
12
14
U11:4
LMC6036
LM660
-
+
2
3
1
4
1
1
U18:1
*
R303
P
S
1
6
5
3
4
2
42TU016RC
T1
-
+
9
10
8
U8:3
LM324
330R
R234
1K
RP5
470u
+
C174
22K
R116
4.7K
R117
10K1%
R245
10K
RP13
100p
C43
1K
R81
BSS
Q17
LM660
-
+
13
12
14
U18:4
29
.001u
C111
47K
R137
P
S
1
6
5
3
4
2
OPTION J
T2
1K
R251
1u
C48
.22u
C159
*
TZ1
1N4001
D22
47K
R241
150R
R141
10K
R220
1M
R129
330R
R289
7
8.2K
R160
1K
R265
.001u
2KV
C170
.47u
C150
*
C102
10K1%
R169
10K
RP12
10K
R197
22K
R127
1M
RP16
560p
C37
33K
R176
P0300
TZ2
.1u
C36
10K
R74
330R
R211
10K1%
R239
-
+
6
5
7
U8:2
LM324
TP2
33K
R193
.001u
C110
300 mA Resettable Fuse
F1
47K
R130
Y25
Q28
22K
R152
30
BSS
Q30
TP15
470K
R140
560p
C94
INDUCTOR
L3
10K
R82
RJ45-10
1
2
3
4
5
6
7
8
9
10
CON7
MIC2940A
VIN
1
G
N
D
2
VOUT
3
U6
100K
R283
430K
R123
2
1
3
S1
SJ14
3.3K
R84
P3100
OPTION C
TZ6
3.9K
R138
390K
R182
.1u
C49
22
CH1847
OPTION C
TIP
1
RING
2
XMIT(-)
7
RCV
6
V
C
C
8
G
N
D
1
0
RI
5
OFFHK
4
X
M
IT
(+
)
9
U13
1u
C52
100K
R277
.1u
C161
33K
R249
100K
R155
22K
R154
43K
R132
100K
RP8
47K
R194
47K
R119
.22u
C89
1M
R146
TP10
JP35
LM660
-
+
9
10
8
U18:3
5K
RP7
.001u
C72
-
+
13
12
14
U10:4
LM324
1000p NPO
C79
47u
+
C115
.1u
C129
23
P0300
OPTION J
TZ10
0R
R307
100K
R87
1K
R232
10K
R262
.001u
2KV
C166
10K1%
R244
-
+
13
12
14
U12:4
LM324
30K
R240
TP1
330R
R106
-
+
13
12
14
U15:4
LM660
B25
Q23
.47u
C153
1u
C53
.47u
C108
9
300mA Resettable Fuse
OPTION J
F7
.1u
C109
.1u
C163
62K
R274
-
+
9
10
8
U12:3
LM324
30K
R175
1M
R190
1M
R118
0R
R209
560K
R185
10K1%
R253
1K
R256
VAN_A
+12V
VAN_A
VAN_A
+5V
+5V
+5V
+5V
+12V
+12V
VAN_A
VAN_A
+12V
+12V
VAN_A
+5V
+5V
VAN_A
VAN_A
VAN_A
+12V
+12V
VAN_A
+12V
VAN_A
VAN_A
+12V
+12V
VAN_A
VAN_A
+12V
VAN_A
VAN_A
VAN_A
VAN_A
VAN_A
+12V
VAN_A
+5V
VAN_A
+12V
+12V
+5V
VAN_A
+VIN
+VIN
RX_LINE_ENABLE_DISABLE
ANTIVOX
VOX
PWM_VOICE
DUPLEX_PARALLEL_CROSSOVER
RX_INPUT
FUNCTION_TONE
GUARD_HOLD_TONE
DTMF_DECODER_1
TELCO_RECV_MUTE
TX_OUTPUT_ENABLE_DISABLE
PWM_VOICE
DTMF_DECODER_2
TX_IN_ENABLE_DISABLE
+13_TO_18_VDC
RING
HOOK
SCR_TX_IN
SCR_TX_OUT
SCR_TX_IN
SCR_TX_OUT
SCR_RX_IN
SCR_RX_OUT
SCR_RX_OUT
SCR_RX_IN
SCR_MODE_IN
SCR_PTT_IN
TELCO_FEEDBACK_DISABLE
SCR_OFF_HOOK
TX_MOD_INPUT
SCR_COR
SCR_MODE_OUT
HLG_DET
GUARD_FUNCTION
GUARD_FUNCTION
TELEMETRY_PTT
OPTIONAL 4 WIRE TX ONLY
6 VOLTS
ANALOG REFERENCE
RX LINE AMP
RX
LINE
LEVEL
AUDIO MIXER
COMPANDOR
RX INPUT
LEVEL
TX AMP
3 KC LOWPASS
300 Hz HIGHPASS
TX OUTPUT
LEVEL
GUARD/HOLD TONE NOTCH/
GUARD/HOLD TONE DETECTION
FUNCTION TONE DETECTION
BANDPASS FILTER
MOBILE PRIORITY
TELCO PTT
GUARD/HOLD TONE BANDPASS FILTER
TTC-1 POTS OPTION
BASE
STATION
BASE
STATION
COMPANDOR
GUARD/HOLD TONE
NOTCH NULL
DUPLEX
CROSSOVER
LEVEL
SEE MCU PAGE
SEE MCU PAGE
RX NOTCH BANDPASS TUNING
2000 TO 3100 HZ.
TX NOTCH BANDPASS TUNING
(0805)
(0805)
(MULTITURN)
(1206)
(0805)
2000 TO 3100 HZ.
(0805)
(0805)
(0805)
(1206)
(MULTITURN)
2 WIRE RX/TX
4 WIRE RX ONLY
2000 TO 3100 HZ.
approx. 700mvp-p
180mvpp@1Kc
400mvpp
approx. 8.8Vpp@1Kc
Transmitting to Remotes at -10 db
TP4 should be approx 540mvp-p.
Approx. 1.2Vpp
@-20dbm
Low Lvl Guard -
RP13 at center
MICROWAVE (M LEAD)
TELEMETRY RADIO RECV AUDIO
TELEMETRY RADIO MODULATION
TTC-1 TELEMETRY RADIO OPTION
TELEMETRY RADIO OPTIONAL
approx.
@1Kc
220mvpp@-20dbm
Low Lvl Guard
Approx 1Vpp@-20dbm
LowLvl Guard
TP6 Approx 600mvpp
@-20dbm
Low Lvl Guard
Approx 750mvpp
@-20dbm@1Kc
Approx 3.7Vpp
@-10dbm@1Kc
RP8 at center
TP6 Approx 5.8Vpp
@+10dbm
High Lvl Guard
TP21 Approx 1V
Middle
High Lvl Guard
+5V
.1u
C119
22K
R272
.1u
C118
330K
R203
3.3K
R200
1K
R199
100K
R201
33K
R202
.1u
C117
1u
C116
.001u
C34
560p
C31
.47u
C151
.47u
C152
TTC-1 ONLY
RX
LINE
LEVEL
75K
R268
100K
R205
750K
R204
15K
R207
15K
R208
.47u
C122
.1u
C123
68p
C120
.001u
C180
.01u
C178
820p
C63
47p
C172
47K
R308
.22u
C181
0R
R309
2
1
A7
D24:1
3
1
A7
D24:2
3
1
A7
D23:2
2
1
A7
D23:1
SD1
D34
*
D33
WIRE
)
1
1
2
2
3
3
JP27
WIRE
)
1
1
2
2
3
3
JP26
WIRE
(
1
1
2
2
3
3
JP22
JUMPER
)
1
1
2
2
3
3
HI-Z JUMP 1&2
LO-Z JUMP 2&3
LO-Z HI-Z
JP25
1
1
2
2
)
JP36
1
1
2
2
)
JP40
1
1
2
2
)
JP37
1
1
2
2
)
JP38
1K
R310
1K
R311
NetC171_1
NetR81_1
NetR145_2
0R
R312
470p
C183
* = NOT INSTALLED
WIRE
)
11
22
33
JP45
1u
C182
10K
R353
100K
R355
BSS
Q40
SECONDARY_RX_LINE_EN_DE
0R
R350
TP23
TP16
VOICE_STORE
10K
R354
.47u
C184
PWM_2175
0R
R351
4.7u
C35
4.7u
C38
4.7u
C44
10u
C112
10u
C54
10u
C69
10u
C173
2R
R352
2.2u
C56
JUMPER NO
RX AMP
3 KC LOPASS SHORT SJ15
OR DE-EMPHASIS OPEN SJ15
SJ15
2.2u
C87
1u
C200
.001u
C202
560p
C203
INDUCTOR
L8
0R
R358
0R
R357
10K
R94
.47u
C58
PWM_VOICE_1
1000p NPO
C81
SB1
D25
CP
CJS
2005-11-29
DML
2013-05-08
F-2
1 of 2
7503
MIDIAN ELECTRONICS, INC.
DATE:
DESIGN:
DWN BY:
REV:
APPR
COPYRIGHT ©
REV
SHEET
PROJECT NUMBER
DOCUMENT NAME
SCHEMATIC
2013
TTC2<2WIRE>
0R
JP22R23
0R
JP26R23
0R
JP27R12
0R
JP27R23
0R
JP45R12
