Midland Radio SP-300 - Manual (Page 44)

PAGE -41-
May 2001
SCHEMATICS & BLOCK DIAGRAM
VHF FRONT-END
(148-174MHz Band Shown)
Schematic P/N: 770-110-0012 Rev. C
PCB Assy. P/N: 650-110-0012 Rev C
Notes:
1. ALL VALUES ARE IN OHMS,
MICROHENRIES OR MICROFAR-
ADS UNLESS OTHERWISE SPECI-
FIED.
2. ALL RESISTORS ARE 1/10W 5%
UNLESS OTHERWISE SPECIFIED.
Notes:
1. ALL VALUES ARE IN OHMS,
MICROHENRIES OR MICROFAR-
ADS UNLESS OTHERWISE SPECI-
FIED.
2. ALL RESISTORS ARE 1/10W 5%
UNLESS OTHERWISE SPECIFIED.
VHF POWER AMP
(148-174MHz Band Shown)
Schematic P/N: 770-230-0012 Rev. A
PCB Assy. P/N: 650-230-0012 Rev. A
Notes:
1. ALL VALUES ARE IN OHMS,
MICROHENRIES OR MICROFAR-
ADS UNLESS OTHERWISE SPECI-
FIED.
2. ALL RESISTORS ARE 1/10W 5%
UNLESS OTHERWISE SPECIFIED.
UHF POWER AMP
(440-470MHz Band Shown)
Schematic P/N: 770-230-0013 Rev. B
PCB Assy. P/N: 650-230-0013 Rev. B
Notes:
1. ALL VALUES ARE IN OHMS,
MICROHENRIES OR MICROFAR-
ADS UNLESS OTHERWISE SPECI-
FIED.
2. ALL RESISTORS ARE 1/10W 5%
UNLESS OTHERWISE SPECIFIED.
UHF FRONT-END
(440-470MHz Band Shown)
Schematic P/N: 770-110-0013 Rev. D
PCB Assy. P/N: 650-110-0013 Rev. D
zN
ote: Schematics are for reference only. Based on band selection, reference designators and part val-
ues may differ from schematics shown.
L504
1.2UH
R505
33
R501
2.7K
Q501
MMBR951
C501
22P
1
R502
8.2K
L501
4T
C502
8P
D501
KDS181
C504
7P
L502
1.2UH
R506
22
Q502
BLT50
L503
7T
C505
20P
R504
2.2K
C508
11P
C507
22P
C509
N/F
L505
7T
Q503
BLT52
C513
4P
C515
43P
C514
15P
L506
N/F
6
7
C512
220P
5
C511
0.001
C506
220P
4
C500
220P
C503
220P
3
R503
6.8
2
R501
2.7K
Q501
MMBR951
2
1
R502
8.2K
C501
3P
L501
56NH
L502
27NH
L504
8T
C508
N/F
L505
4T
C504
18P
L503
150NH
L506
2.2uH
Q503
BLT52 R509
56
R506
22
C502
39P
Q502
BLT50
R503
200
R510
0
C505
C509
39P
12P
C507
47P
R505
33
R507
82
C506
0.01
C503
0.01
6
L508
5T
C514
24P
L509 8T
L507
4T
C517
22P
C513
82P
R508
82
7
C515
0.01
C512
0.01
5 4 3
C602
11P
1
IN
C603
9P
C605
7P
C606
9P
C608
24P
R601
56K
Q601
2SC5084
C610
33P
4
RX 5V
L604
4T
R602
100
C613
5.6P
C615
7P
C616
6P
C618
7P
C621
33P
C619
6P
6
OUT
5
GND C623
22P
L606
4T
L607
4T
C620
N/F
C622
18P
L605
4T
C617
4P
C624
4P
C614
3.3P C612
470P
D601
KDS226 L603
4T
C609
18P
C607
16P
L601
4T
L602
4T
C604
20P
C601
10P
2
GND
L601
6T
C601
680pF
C602
39pF
C603
56pF
C605
0.001
L602
6T
L603
6T
C604
100pF
C606
120pF
C607
39pF
R601
180
L604
6T
R603
820
C608
33pF
Q601
MMBR951
R602
6.8K
C611
100pF
D601
KDS226
C613
39pF
C616
9pF
C617
47P
C622
0.01uF
L607
6T
C623
39pF
C621
100pF L605
6T
C614
120pF
C615
N/F
C618
N/F
L606
6T R604
2.2 R605
3.3K
C612
47pF
6
5 2
1
4 3