Elecraft K2 Owner's Manual - Manual (Page 144)

F r o n t P a n e l B o a r d
Relays are shown in RESET
(Vout = 0 to 4.096V)
VFO Range Selection
Key/Keyer/Paddle
PLL Synthesizer PLL Reference
0.05 Ω , 1%, 3W
Current Sense
C o n t r o l
K2 RF Board
1µF
V BIAS-XFIL
W. Burdick
12-Bit DAC
E. Swartz
12.096MHz
B o a r d
R.F. GAIN
R.F. GAIN
Elecraft
MC145170
I.F. OUT
/DAC2CS
LTC1451
1SV149
VFO ALC
PN2222A
Speaker
V RFDET SR DOUT
/DAC2CS
SR DOUT
12V DC
Phones
/PLLCS
OSCOUT
REFOUT
LMC662
LMC662
2N7000
LD /CS
Buffer
AF OUT
1N4148
LT1252
1N4148
1N4148
1 of 4
12V IN
95SQ015
RX VFO
/SR RD
SR DIN
SR WRT
V POTS 12V IN AUXBUS
AF OUT /PLLCS
AF OUT
SR DIN SR WRT /SR RD AUXBUS V POTS MIC AF
TX VFO
Rev. Sht.
100K
MV209
OSCIN
PDOUT 100K
78L05
18µH
4.7µH
1.2µH
RFC14
Power
2.2µF 2.2µF
220µF
MV209
1SV149
100µF
SR CK ENC B V BFO
ENC A V ALC
/DASH
SR CK ENC A ENC B
V AGC
RFC16
47µH
2.2K
10µF
10K
Date
/ENB
DOUT
PH R
PH V J310
DOUT
VOUT
12µH
J310
100K
2.7K
10K
.001 .001
10K
10K
2.7K
R115
C105
C106
C103
3.3M
C196
10K
ICLK
IDAT
VOL1
VOL2
/DOT-PTT
ICLK VOL1 VOL2
/DOT-PTT
IDAT
.01
RFC10
2.7K
C100
.001
C175
L31
1.8K
27K
10K
.01
C92
C93
C68
C67
C73
C63
C64
C65
C59
C62
C58
C71 C72
C75
C74
.01
0.1
R35 R36
U6A
U6B
SCK
SDO
120
120
C84
C85
R21
270
R20
RD
RC
SCK
SDO
FIN
DIN
CLK
VSS
VDD
R24 R25
R28
R17
R31
0.1
C86
R15
CLK
DIN
GND
REF
VCC
.022
OUT
VFO
C87 RP2
Q17
R14
R13
560
R12
R11
.01
560
.001
0.1
Q16
D11
0.1
.01
.01
D13
D22
R32
270
470
K15
K14
K13
C61
D16
82 82
Q18
Q19
D18
D21
D25
D23
L30
D10
OFF
D26
D24
R22
D17
.047
C60
R10
15K
R33
RP2
12V
PD2
PD1
12V
SCK
SDO
12V
C94
.047
C95
120
R30
1mH
C96
TP1
TP3
R19
.01
C2 C1
R9
U3
47
By J2
U4
U5
U8
X2
FR
10
FV
11 LD
12
13
14
15
16
33
IN
P3
J3
T5
82
20
nc
nc
J1
P5
ON
S1
R2 R1
220 220
8B
8B
X1
470
8B
8B
J6
8R 8T 8A 5A
5A 8A
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
J7
5A
10 11 12 13 14 15 16 17 18 19 20
P1
10
11
12
13
14
15
16
17
18
19
20
J8
5B
8B
8B 5B
8R
8A
10pF
3
2
1 +
-
8
4
1
2
3
4
5
6
7
8 9
5
6
7
+
-
G
D
S
G
D
S
1
2
3
4 5
6
7
8
+
1
2
G
D
3
2
6 +
-
7
4
S
2 4
3
9 7
8
2 4
3
9 7
8
2 4
3
9 7
8
+
-
2
1 3
4
1 2
+ +
+
+
1 2 3 4 5 6
1
2
3
4
5
6
7
8
9
1 2 3 4 5 6 7 8 9
1
2
3
4
5
6
7
8
9
EXT ALC
100K
R16
1 2 4 3
4, 5
C90
.047
/DOT-PTT
/DASH 8R 8T
Q23
82
R113
2N7000 8T
8R
2, 3 1
Appendix B
C111
2.2µF
+
1M
R18
D12
SB530
F1
RGE300
Aux. 12V
position. See relay table (key).
MV209
D19 D20
10K
R29
VOL3
VOL3
1N4148
D8
~2Vpp
(NOTE 1)
Oscillator
12.090-12.100 MHz
(NOTE 2)
(NOTE 2)
C89
.001
RFC15
.001
C91
5B
100 µH
(NOTE 3)
NOTE 1: X2 is not used.
10K
12K RB
Rt
33K RA
8
8B
Thermistor
Thermistor Board
C88
68
(NOTE 3)
NOTE 3: These components improve PLL stability; they must be soldered on the back of the board (see text).
(NOTE 3)
10K
RF
6, 7
10K RE
4V
(replaces RP3 on PC board)
4V
1/27/04 F
NOTE 2: D19-D20 are supplied with the K60XV option. They must not be installed unless the K60XV option is
also installed (60 m band and transverter I/O). C71 must be changed to 120 pF if D19-D20 are installed.