ELECRAFT K1 - Appendix B K1 RF Board Schematic (continued)

Transmit Mixer/Osc.
RF Output Detector
Key/Keyer/Paddle
K1 RF Board
(ATTN Relay)
W. Burdick
Appendix B
T-R Switch
4.915 MHz
To FIL-P2
E.Swartz
ZVN4424A
RCV RF
2SC2166
2SC1969
Driver
1N4007
1N4007
1N4007
1N4007
12V DC
2 of 2
1N5711
Buffer
1N4007
PREMIX
1N4007
LT1252
1N4007
100µH
100µH
SB530
Power
RF/SMTR
SA612
3.3
Ω
RFC5
22µH
47µH
RFC3
RFC4
1.8K
1.8K
100K
2.7K
Ant.
1.5K
.01
226
Ω
100K
J309
.047
POWER
10µF
2.7K
6T
.001 .001
.001
RFC2
6A
C50
R31
12V
R30
.047
C55
0.1
R29
270
C45
C44
C47
C46
C49
C48
.01
R26
.01
.01
.01
0.1
.01
R27
D10
D12
D11
R25
D13
R24
D16
OFF
C43
R36
R37
R34
D15
C58
3.9K
.01
120
R35
D18
C60
.01
C16
C57
C62
330
C15
C14
470
C59
.001
D14
820
C29 C28
C56
.047
820
R22
82
.001
22 µH
Q7
Q6
33
T3
D9
Q4
J5
J4
ON
S1
PA
U8
RP5
Q5
V-
V+
U9
R12
R11
C13
50
R10
R9
R28
J3
33
X6
D5
J7
10
K1
3
4
1
2
L2
D
S
G
1
2
3
4
5
76
8 G
D
S
1
2
3
2
6
+
-
7
4
+
12345678
1
1%
1%
6R/AUX
2
4
1
3
T4
C52
0.1
D19
36V
R33
470
3.9K
RP4
5
6
3.9K
RP4
3
4
Q14
3.9K
RP4
12
2N4124
RP5
4
3
RP5
6
5
R19
R20
20K
39K
KEYIN
6A
3.9K
3.9K
/DOT/DASH
.001
C51
12V
R32
33
TR1
BUF
MIX
OSC
ATTN
BPF
TR2
DRV
PA
ANT
RFD
PRE
TR3
Transmit signal-tracing points (see text)
12345678
J8
To FIL-P3
1N4753
Transmit Attenuator
270
R38
+-
10
C3
100µH
RFC7
6R_2
6R_2
6R_2
C75
.01
C1 150
Aux 12 V
Elecraft
Rev. Sht. DateBy
1.8K
R39
6R_2
G
OPER
OFS TEST
S2
6T 6A
P3
321
*
If not, jumper P3 pins 1-2.
If the KAT1 ATU is installed, jumper P3 pins 2-3.
RF Det
*
Source
C78
+
220µF
C53
+
C76
.01
5.6K
R4
12V_2
RFC8
12V
**
80-m band kit. If 80 m is not used,
install a jumper at RFC8.
**
1/5/02
RFC8 is supplied with the
C78 is supplied with
the 80-m band kit