Midland Radio SP-300 service manual Vhf Front-End, Uhf Front-End, VHF Power AMP, UHF Power AMP

6

5

		4	3
		C605
		0.001
			R601
			180
C601	L601	C603
680pF
		56pF
	6T
		L602	L603
		6T	6T
C602	C604	C606	C607
39pF	100pF	120pF	39pF

C608

33pF

R602

6.8K

Q601		R603	C611	L604	C613		C616
		820			39pF		9pF
MMBR951			100pF	6T
R604						L605	L606
		C612				6T	6T
2.2				D601
	R605	47pF			C614	C615
				KDS226
	3.3K				120pF	N/F

C617

47P

C621

100pF

C618

N/F

RX 5V

4

R601

56K

C621

C619

C618

C616

C615

C613

C610

C608

C606

C605

C603

C602

33P

6P

7P

6P

7P

5.6P

R602

33P

24P

9P

7P

9P

11P

100

IN

6

1

OUT

L604

Q601

4T

2SC5084

L607

C622

C609

6T

C622

18P

18P

0.01uF

D601

L606

C614

C624

C612

KDS226

L603

C607

L602

C604

4P

1

4T

3.3P

470P

4T

16P

4T

20P

GND

5

C617

2

C623

GND

C623

L607

C620

L605

L601

C601

22P

4T

N/F

4P

4T

4T

10P

39pF

2

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 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.

2.

ALL VALUES ARE IN OHMS, MICROHENRIES OR MICROFAR- ADS UNLESS OTHERWISE SPECI- FIED.

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

R501		C509				R505
2.7K					L506	33
		12P
Q501			Q502		2.2uH
MMBR951	C502	L502	BLT50	C505	L505					C515
C501				39P
	39P	27NH						L507	L508	0.01
					4T
3P
1						L509	8T	4T	5T
			L503
				R509		Q503
			150NH			BLT52
				56				R508
	C504							82
	18P
R502				L504	C507	C508			C513	C514
8.2K	L501			8T
			R503
	56NH
								C517	82P	24P
			200		47P	N/F
						R507		22P
						82
	C503
			R510	C506
			0
	0.01			0.01

R501
2.7K
Q501
MMBR951	C502
C501	8P
22P
1				L502
6				1.2UH
R502	L501	C504
8.2K			R506
	4T
		7P	22
				C500
				220P
	C503
	220P
2
			D501

Q502

BLT50

L503

7T

R504

L504

1.2UH

C505

20P

C507 C508

22P11P

C506

220P

R505

33

Q503

BLT52

C509

N/F

L505

7T

C513

4P

C512

220P

C515

43P

C514 L506

N/F

15P

6

7

2
		C512
		0.01
	R506
	22
3	4	5
Notes:	VHF POWER AMP

7	KDS181
	R503
	6.8
	3
	Notes:

2.2K

C511

0.001

4 5

UHF POWER AMP

1.ALL VALUES ARE IN OHMS, MICROHENRIES OR MICROFAR- ADS UNLESS OTHERWISE SPECI- FIED.

2.ALL RESISTORS ARE 1/10W 5%

UNLESS OTHERWISE SPECIFIED.

(148-174MHz Band Shown)

Schematic P/N: 770-230-0012 Rev. A

PCB Assy. P/N: 650-230-0012 Rev. A

1. ALL VALUES ARE IN OHMS, MICROHENRIES OR MICROFAR- ADS UNLESS OTHERWISE SPECI- FIED.

2. ALL RESISTORS ARE 1/10W 5%

UNLESS OTHERWISE SPECIFIED.

zNote: Schematics are for reference only. Based on band selection, reference designators and part val- ues may differ from schematics shown.

(440-470MHz Band Shown)

Schematic P/N: 770-230-0013 Rev. B

PCB Assy. P/N: 650-230-0013 Rev. B

PAGE -41- May 2001