©2012 Hamtronics, Inc.; Rochester NY; USA. All rights reserved. Hamtronics is a registered trademark. Revised: 2/14/16
- Page 5 -
PARTS LIST FOR R303
RECEIVER.
Note: Values which vary with freq. band are
shown in a table below. Resistors and capacitors
are 0805 or 0603 smt type unless noted otherwise.
Caution: IC’s are static sensitive. Use ap-
propriate handling precautions to avoid damage.
Ref Desig Value (marking)
C1
0.1µf
C2
100pf
C3
0.1µf
C4
100µf electrolytic
C5
0.15µf mylar (red)
C6
.01µf
C7
.001uf
C8-C9
100µf electrolytic
C10
0.1µf
C11
390pf
C13
100µf electrolytic
C14
390pf
C17
7pf
C18
390pf
C21
3pf
C24-C25
390pf
C32
4pf
C35
.033µf
C36
7pf
C37
4pf
C38
7pf
C39
.001uf
C40
1µf electrolytic
C41
0.1µf
C42-C43
.001µf
C44-C45
.033µf
C46
0.1µf
C47
4.7µf electrolytic
C48
0.1µf
C49
100µf electrolytic
C50
68pf
C51
220pf
C52-C54
0.1µf
C55-C56
100µf electrolytic
D1
BB132 varactor diode
D2
MMBT5179 (used as diode)
D3-D4
MMBT3904 (used as diode)
FL1-FL4
10.7MHz crystal filter
(matched set of 4)
FL5
LT455DW ceramic filter
J1
RCA Jack
J2
6 pin header
L2
0.33µH RF choke
(red-sil-orn-orn)
L3-L8
2½ t. ,slug tuned (red)
Q1-Q2
MMBT5179
Q3
MMBT3904
Q4-Q5
BF998 MOS FET
Q6
MMBT3904
R1
180
R2
27
R3
10K
R4
47K
R5
27
R6
1K
R7
27
R8-R10
10K
R11
180
R12
47
R13
10K
R14
3.9K
R15
470
R16
1meg
R17
1K
R18
10
R19-R20
100K
R21
27
R22
47K
R23
27
R24
330K
R25
100K trim pot
R26
47K
R27
100K
R28
15K
R29
2meg
R30
47K
R31
510K
R32
4.7K
R33
680
R34
1K
R35
22K
R36
100K
R37
100K trim pot
R38
47K
R39
10
T1-T2
10.7MHz IF xfmr
(T1005)
T3
455kHz IF xfmr
(T1003)
U1
MC9RS08KA1CP µP
U2
LMX1501A PLL
U3
10.240 MHz TCXO
U4
MC3361BPD IF ampl
U5
LM386N-1 AF output
U6
78L05ACD regulator
XU1
8 pin ic socket
Y1
10.245 MHz crystal
Values which vary with frequency band:
R303-1 is 138 - 144 MHz
R303-2 is 144 - 154 MHz
R303-3 is 154 - 164 MHz
R303-4 is 164 - 174 MHz
R303-5 is 216 - 230 MHz
Ref
-1
-2
-3
-4
-5
C12
10
10
10
10
8
C15
20
15
12
10
8
C16
68
68
62
47
47
C19
43
39
30
27
12
C20
82
68
62
62
33
C22
30
27
22
20
8
C23
82
68
62
62
27
C26
22
20
18
15
6
C27
0.5
0.5
0.5
0.5
0.3
C28
22
22
18
15
8
C29
0.2
0.2
0.2
0.2
n/u
C30
22
20
18
15
7
C31
3
3
3
3
1
C33
39
33
27
22
10
C34
82
82
68
62
27
L1
2½t
(red)
2½t
(red)
2½t
(red)
2½t
(red)
1½t
(brn)
