MFJ-836H SWR/Wattmeter and RF Ammeter
Instruction Manual
7
Schematic
SWR / Wattmeter
C203
N/L
C204
15pF
C201
150pF
C202
150pF
C207
15pF
R201
N/L
R202
68
R205
N/L
OUTPUT
INPUT
Q103
MPS-A13
Q102
2N3904
D201
IN34A
D202
IN34A
C205
.001
C206
.001
REFL
FRWD
R203
47
R204
47
J101
Q104
2N3906
L201
1000uH
1
2
T202
3
2
1
SW 101B
SW 103A
FWD
R116
1M
R117
470
R118
33k
+
C110
220
+
C111
.47
R115
100k
9V BATTERY
+
-
+
C109
100
C108
.01
D103
IN4007
+12V
SW 103B
LP-
LP+
METER LAMP
R109
150k
R108
50k
2
1
R110
N/L
2
1
R111
68k
R112
470
C104
.001
U101
LM324
+
3
-
2
OUT
6
D102
IN34A
+12V
SW 102B
+
C106
10
R113
IM
U102
LM324
+
3
-
2
OUT
6
C107
.01
R114
22k
R120
25k
2
1
FM
FG
FORWARD METER
Q101
2N3904
SW 101A
REF
R102
150k
R101
50k
2
1
R103
N/L
2
1
R104
82k
R105
470
C101
.001
U103
LM324
+
3
-
2
OUT
6
D101
IN34A
+12V
SW 102A
+
C102
10
R106
IM
U104
LM324
+
3
-
2
OUT
6
C103
.01
R107
10k
R119
10k
2
1
RM
RG
REFLECTED METER
RF Ammeter
T1
Sense Coil
Line Under
Test
R2
10
R1
7.5k
R3
1k
R4
28k
D2
Det
Calibrate
10A
3A
30A
R5
90k
30A
Range
3A
10A
