HAMTRONICS r304, Installation Operation & Maintenance, Page: 8 / 10

©1998 Hamtronics, Inc.; Hilton NY; USA. All rights reserved. Hamtronics is a registered trademark. Revised: 4/2/03 - Page 8 -
PARTS LIST FOR R304 UHF
FM RECEIVER.
Following are notes specific to cer-
tain parts.
➊ Microcontroller must be factory
programmed for proper band.
➋
Resistors used as test point.
These must be installed on the board
oriented properly and with the top loop
an extra 1/6” high to allow for connec-
tions to the loop later. (See detail in
component location diagram.)
➌ This part must be installed with a
small space (about the thickness of an
index card) under the part to prevent
the bottom of the part from shorting to
the ground plane.
➍
This part is surface mounted on
rear of board.
0 Caution: Ic’s are static sensi-
tive. Use appropriate handling pre-
cautions to avoid damage.
Ref Desig Value (marking)
C1 1 µf electrolytic
C2 ➍ 0.1µf
C3 n/a
C4
➍
0.1µf
C5 10µf electrolytic
C6 100µf electrolytic
C7 n/a
C8
➍
100pf
C9
➍
0.1µf
C10 0.15µf mylar (red)
C11 ➍ .01µf
C12-C13 ➍ .001uf
C14 100µf electrolytic
C15
➍
0.1µf
C16
➍
6pf
C17,C18
➍
390pf
C19 100µf electrolytic
C20
➍
10pf
C21
➍
47pf
C22
➍
4pf
C23 ➍ 100pf
C24 ➍ .001uf
C25 4.5pf var. (white ceramic
with brown cap.)
C26
➍
2pf
C27 4.5pf var. (white ceramic
with brown cap.)
C28
➍
6pf
C29
➍
100pf
C30 4.5pf var. (white ceramic
with brown cap.)
C31
➍
100pf
C32 4.5pf var. (white ceramic
with brown cap.)
C33
➍
2pf
C34 n/a
C35
➍ 0.5pf
C36 n/a
C37
➍ 100pf
C38-C39 4.5pf var. (white ceramic
with brown cap.)
C40
➍
.001uf
C41
➍
5pf
C42
➍
6pf
C43
➍
5pf
C44 0.47µf electrolytic
C45 0.15µf mylar (red)
C46-C47 ➍ .001uf
C48 0.15µf mylar (red)
C49-C50
➍
.01µf
C51 470µf electrolytic
C52 10µf electrolytic
C53 1µf electrolytic
C54 100µf electrolytic
C55 100µf electrolytic
C56
➍
220pf (221)
C57 ➍ 68pf
C58-C60 ➍ 0.1µf
C61 ➍ .001uf
C62 4.5pf var. (white ceramic
with brown cap.)
D1 BB809 varactor diode
D2-D3 1N4148 switching diode
FL1-FL4
➌
10.7MHz crystal filter
(matched set of 4)
FL5 455kHz ceramic filter
J1 RCA Jack
L1 1½ turn slug-tuned coil
(brn)
L2 0.22µH RF choke
(red-sil-red-red)
L3-L4 2¾ turn air wound coil
L5 4¾ turn air wound coil
L6 1¾ turn air wound coil
L7 2¾ turn air wound coil
L8 5¾ turn air wound coil
L9 2¾ turn air wound coil
L10 5¾ turn air wound coil
Q1 2N5770
Q2-Q3 PN5179
Q4 2N3904
Q5 n/a
Q6-Q7
3SK122 MOS FET
Q8 2N3904
Q9 2N5770
R1 47
Ω
R2
➍
100K
R3
➍
2meg
R4
➍
47K
R5
➋
22K
R6 100K
R7 330K
R8
➍ 2.2K
R9 ➍ 10K
R10 6.8K
R11 3.9K
R12 180
Ω
R13
➍
47
Ω
R14
➍
15K
R15 ➍ 470 Ω
R16 180 Ω
R17-R18
➍
100K
R19 15K
R20
➍
2.2K
R21
➍
15K
R22
➍
2.2K
R23
➋
470
Ω
R24 ➍ 27 Ω
R25 180
Ω
R26
➍
47K
R27
➍
330K
R28
➍
4.7K
R29
➍
680
Ω
R30
➋
1.2K
R31 ➍ 22K
R32 100K panel mount pot.
R33 ➍ 2.2K
R34 ➍ 4.7K
R35
➍
47K
R36 330K
R37 3.9M
R38
➍
47K
R39 100K panel mount pot.
R40
➍
47K
R41 ➍ 100K
R42 ➍ 47K
S1 10 pos. DIP switch
T1 10.7MHz IF xfmr
(7A-691F)
T2 455kHz IF transformer
p/n 831-5 or YMC-15002
or T1003
U1 0
➊
MC68HC705J1A µP
U2 0 MC145190F synthesizer
U3 0 10.240MHz TCXO
U4 MC3361BP if ampl-det
U5 LM380N-8 audio output
U6 78L08 regulator
Y1 ➌ 10.245 MHz crystal
Z1-Z4 Ferrite bead, prestrung