Midland Radio SP-300 User Manual
PAGE -45-
May 2001
VHF RF Schematic
MOD
1
2
3
4
5
6
7
8
MIXER
PWR H/L
G
A
1
A
1
1
-
I
N
I
N
2
+
I
N
I
N
3
G
N
D
N
D
4
O
U
T
U
T
5
V
C
C
C
C
6
B
.
P
.
P
7
G
A
2
A
2
8
AUDIO AMP
OSO
1
LD
2
*R
3
*V
4
VPD
5
PD
6
GND
7
RX
8
FIN
10
FIN
11
VCC
12
VDD
14
EN
17
CK
18
DT
19
OSI
20
TST1
9
TST2
13
O/B
15
O/A
16
MC145191F
PLL EN
DATA
CLOCK
CLOCK
4
3
TCXO
1
2
2
1
M
I
X
I
X
I
1
6
6
O
S
C
1
S
C
1
1
Q
U
A
D
U
A
D
8
D
C
O
U
P
C
O
U
P
7
D
C
O
U
P
C
O
U
P
6
L
M
T
M
T
I
5
V
C
C
C
C
4
M
I
X
I
X
O
3
O
S
C
2
S
C
2
2
A
F
F
9
F
I
L
I
L
I
1
0
0
F
I
L
I
L
O
1
1
1
S
Q
Q
I
1
2
2
M
E
E
D
R
V
R
V
1
3
3
M
U
T
E
U
T
E
1
4
4
G
N
D
N
D
1
5
5
IC5
MC3371
CHARGE
VOLUME
N/S SW
SPK
AUDIO
AUDIO
ALERT
AF EN
LOCK D/T
P/S 5V
TX EN
RX EN
RX EN
TX 5V
BUSY
BUSY
C57
470P
REVISIONS
CHG B
Y
DATE
DESCRIPTION
DESCRIPTION
REV
TITLE
SCALE
SHEET
OF
SIZE
DOCUMENT
NUMBER
B
1
1
NA
FUSE
SCHEMATIC
P/N: 650-200-0004
NICAD
BATTERY
7.5V
P/N: 650-210-0010
+
+
-
B+
C146
220P
C145
470P
D15
4004
R43
10K
MOD
12
13
14
11
16
15
17
18
1
2
4
5
6
7
Q14
KTC3875S (ALL)
TX 5V
R41
100
C55
0.001
L5
100nH
R42
12K
R26
18
R27
4.7K
R37
3.3K
C53
1UF
R35
8.2K
R36
0R
C54
0.001
D20
KDS160
C46
8P
L4
100nH
C51
10P
Q16
MMBC1321
R34
18
C50
33P
R31
300
R32
300
Q17
MMBC1321
C56
0R
(RC56)
R33
3.3K
1
2
6
7
C68
0.001UF
TX B2
R56
270
L6
1uH
C67
470P
L7
4T
L8
4T
L11
4T
D5
UPP9401
C77
0.001uF
C76
9PF
C72
6PF
C73
30PF
C74
36PF
C75
24PF
R70
470K
L13
8T
C49
N/F
ANT1
STUD
R58
470K
D6
UPP9401
R69
470K
C83
7P
5V
B+
R59
39
R57
100K
1%
R61
68K
1%
R109
0.1
1W
R99
100K
1%
C82
470P
R135
4.7M
C78
470P
R62
68K
1%
IC3A
LM358
C81
470P
1
2
3
3
-
+
8
4
C80
470P
Q19
KTC3875S
R110
270
C59
0.47
(40)
RV1
10K
C60
4.7/10
+
C84
0.001
5
4
Q22
KTA1663
(HY)
D17
5817
C66
470P
B+
R53
10K
10K
C70
1uF
R47 2R2
R48
R51
2R2
2R2
R54
1K
Q21
KTC3875S
(ALL)
R55
1.5K
C14
470P
C88
0.1
+
R52
3.3K
Q18
KRC104S
(ND)
R50
1M
C65
10/10
R79
56
R64
22
C64
470P
TX B2
R49
22R
C79
0.1
7
6
5
5
-
+
C58
470P
TX 5V
C61
470P
C63
0.01
IC3B
LM358
R45
12K
R46
2.2K
C62
470P
RV3
10K
R63
150
Q23
KRC104S
(ND)
3
C45
10P
C47
470P
R28
56
PRE OUT
Q13
KTC3875S (ALL)
C39
0.001
R25
3.3K
C44
4.7/10(T)
D18
KDS160
R24
5.6K
L3
1.2uH
+
C37
33P
C19
470P
C907
0.1
D901
KDS226
Q901
KTC4075
C903
0.01
R901
2.2K
C910
0.01
R904
7.5K
C905
18P
R906
7.5K
C911
0.01
R908
10
R905
27K
R907
27K
R909
470
R21
100
C34
220P
C43
3P
R22
4.7K
R23
120
C35
0.001
C36
14PF
C38
43PF
C41
N/F
SWB+
7.5V
L1
47nH
L2
0R
(RL2)
C42
0.001uF
D9
ND433G
T2
T3
C85
N/F
C87
27P
OUT
6
5
L31
N/F
C69
N/F
L12
1.2uH
C90
7P
C92
30P
C93
82P
LK100
N/F
XF1
45.1M
L14
470nH
R65
51
L15
150nH
R66
100
GND
2
1
4
B+
PWR
SW
SWB+
Q34
KRC104S
(ND)
Q33
KTA1504S (ASY)
R113
470K
R114
100K
C134
0.047
R115
22
C132
4.7/20
+
+
C133
1/16
IC6
LM386N-3
+C135
10/4
Q12
BFR92A
(P2)
C901
0.01
C902
0.01
D902
KDS226
C904
0.01
Q902
KTA2014
C908
33P
Q903
KTC4075
R903
4.7K
C906
18P
Q904
KTC4075
R902
2.2K
C16
2P
IC2
Q905
KTC4075
16V
R16
910
R15
100
C26
0.1
R17
12K
C25
1uF
Q7
KTA1504S
(ASY)
C24
0.01
(P)
R14
2.7K
TP1
Q6
KTC3875S
(ALL)
R12
3K
R13
2.7K
C21
0.33
(P)
C22
0.022
(P)
C23
0.01
(P)
Q11
KTC3875S
(ALL)
R3 2.2K
R4
1.8K
Q8
KTA1504S
(ASY)
R5
1.8K
R6
2K
R7
1.8K
C17
0.1
Q4
KRA110S
(PK)
C15
0.1
R130
100
5V
R125
22
C13
0.01
R2
100K
TCXO (VHF)
12.8MHz
Q5
KRA104S
(PD)
C8
470P
5V
C12
10/6.3
C11
0.1
+
L19
10uH
R1
10K
C20
470P
C1
0.001
SWB+
IC1
TK11450
C109
470P
5V
C2
10/6.3
+
Q1
KRA102S
(PB)
5V
POWER SAVE
C9
0.001
D1
KDS181
(A3)
C3
0.001
5V
Q2
KRA110S
(PK)
C5
470P
5V
TX 5V
TX 5V
C6
4.7/10
C7
0.001
+
Q3
KRA110S
(PK)
RX 5V
C4
0.001
C94
1uF
R67
22K
R68
22K
Q24
KRC104S
(ND)
C96
0.01
C97
33P
R71
1K
Q25
BFR92A
(P2)
R72
220K
C95
4.7/10
+
D8
KDS193
(F3)
R74
R75
47K
C98
0.001
* 22K
15K-27K
C102
0.1u(K)
R76
22K
R77
22K
R87
330K
C107
10P
R78
2.7K
Q26
KTC3875S
(ALL)
R81
2.7K
R86 1K
D11
KDS193
(F3)
R82
10K
R83
18K
R84
18K
R85
39K
Q27
KTC3875S
(ALL)
C108
0.0015
SQ
RV2
1KB
L16
1mH
C104
0.001
C103
470P
C105
47P
TH1
33K
C106
0.01
R89
22
C112
0.033(K)
L17
1mH
R88
100
C111
0.1u(K)
C113
0.1u(K)
LK501
N/F
R123
0R
VR3
20KA
R116
22K
R117
22K
R122
4.7K
R121
220K
C137
470P
R118
N/F
C114
0.01
R92
2.7K
C116
0.1
R93
0R
R91
470
Q28
KRC104S
(ND)
C115
220P
RV4
1KB
Q31
KRC104S
(ND)
R96
39K
D12
KDS193
T1
3210796
C123
0.01
C124 C125
0.1u(K)
R95
82K
C122
0.001
C121
20P
C118
33P
X1
44.645M
C117
47P
L18
1uH
1uH
R94
1K
R98
10K
R106
22K
C127
0.01
C129
10/16
+
+
R97
10
C128
4.7/10
R102
22K
D13
KDS181S
R101
N/F
R103
10K
R104
10K
C131
0.01
R111
10K
R112
22K
CF1
455F
R105
30K
CF2
455HT
D14
KDS181S
Q32
KRC104S
(ND)
R107
N/F
R108
56K
C126
0.01
SP-310, SP-330
VHF RF SCHEMATIC
A
RELEASED TO MFG
DGC
4/20/01
C18
0.001
R8
910
R11
100
VCO TX SECTION
(VHF)
P/N: 650-030-0021
VCO RX SECTION
P.A. MODULE(VHF) SCHEMATIC
P/N: 650-030-0012
FRONT-END (VHF) SCHEMATIC
P/N: 650-110-0012
3
7
8
IN
GND
P/N: 650-100-0002