MFT-20 DSB Transceiver Kit
Page 9
Crystals
Checked
Ref.
Frequency
Ident./Comment Circuit section Located
X1
14.328 quartz cristal
VFO
L-1
X2
L-1
Semiconductors
Checked
Ref.
Type
Ident./Comment
Circuit section
Located
Transistors
Q1
BC547
BC547
Rx Mute
H-8/9
Q2
BC547
BC547
VFO
K-1
Q3
P2222
P2222
Pre Diver
E-5
Q4
BD135
BD135
Driver
E-8
Q5
2SC2078
2SC2078
Output Amp
B-5
IC's
IC1
SA/NE602 SA602AN or NE602AN
Rx Mix
K-8/9
IC2
LM741
LM741CN or UA741
Audio filter & preamp
J/K-6
IC3
LM386
LM386N-1
Audio Amp
I-6
IC4
78L06
MC78L06
Rx Mix 6V supply
L-7/8
IC6
SA/NE602 SA602AN or NE602AN
DSB Generator
E-3
IC7
78L06
MC78L06
DSB Generator 6V
D-4/5
IC8
78L08
MC78L08
TX Bias supply
E-10
Inductors/RF Transformers
Checked
Ref.
Value/Type
Ident./Comment
Circuit section
Located
L1
KANK3335 (1u2H)
K3335 or 1u2H
Rx Mix
K-10
L2
KANK3335 (1u2H)
K3335 or 1u2H
Rx Mix
I-10
L3
KANK3335 (1u2H)
K3335 or 1u2H
Rx Mix
I-8/9
L4
T68-2
Turns = Text
VFO
L3
L5
3,9uH axial inductor
orange-white-gold
VFO
J-2/3
L6
KANK3335 (1u2H)
K3335 or 1u2H
TX Pre driver
E-6/7
L7
FT37-43 toroid 10t - 3t see text
Driver
C/D-8
L8
100uH axial inductor
brown-black-brown
Output Amp Bias
C-6/7
L9
FT37-43
toroid 8+8 see text
Output Amp
A/B-7/8
L10
T37-2
Turns = see text
LPF
B-9
L11
T37-2
Turns = see text
LPF
B-10/11
Diodes
D1
1N4148
4148
Rx/Tx Relay switch
D-9
D2
1N4007 or 4001
1N4007(1)
Output Amp Bias
A-5
D3
Zener 47V 1W
BZX85C47 or Z47
Output Amp protect
B-5
D4
Zener 9V1 0,5W
9V1
VFO
K-3
DV
SVC236
Varactor diode
VFO
M-3