k2 schematics
TRANSCRIPT
Elecraft K2 Schematics Compiled by Sverre Holm, LA3ZA, from manual pages of www.elecraft.com Rev 1.0 - 18 February 2005 Contents:
1. K2 Block Diagram Rev D 3 2. K2 Schematic Key Rev D 4 3. K2 Front Panel Board Rev C 5 4. K2 Control Board Rev F 6 5. K2 RF Board Rev F 7 6. K2 Manual Errata Rev F-2 11
7. KPA100 Schematics Rev G 12 8. KPA100 Errata Rev C-3 14
9. KSB2 Schematics Rev F 15 10. SSB Bandwidth Modification Rev A 16
11. K160RX Schematics Rev A 18
12. KNB2 Schematics Rev D 19
13. KBT2 Schematics 20
14. KAT2 Schematics Rev F 21
15. KAT100 Schematics Rev B 23
16. KIO2 Schematics Rev E 26
17. KDSP2 Schematics Rev C2 27
18. KAF2 Schematics Rev A 29
19. K60XV Schematics Rev B 30 20. K60XV Errata Rev A-3 31
These schematics may be used for personal non-commercial use only. (c) 1999-2005 Elecraft, Inc
LOW-PASSFILTERS
POWERAMP(15W)
BAND-PASS
FILTERST-R
CRYSTALFILTERS
Appendix C BLOCK DIAGRAM
W. Burdick/E. Swartz Rev. D 1-9-04
ATTEN.AND
PREAMP
RCVMIXER
POST-MIXERAMP
BUFFER
DRIVER
XMITMIXER
I.F. AMPT-RT-RNOISE
BLANKER
AGC
BAL.MOD.
VCO
T-R
T-R
BFO
PROD.DETECTOR
Common Transmit ReceiveKEY
PLLSYNTH.
AF AMP
MCU ANDSUPPORTCIRCUITS
DISPLAYAND CONTROLS
4.915MHz
4.915MHz6 - 24MHz
Shaft Encoder
AUDIOFILTER,
portion of the indicated capacitance range is actually used to covereach Amateur band segment. VCO frequency can be calculated based on
** Based on an I.F. of 4915 kHz (e.g., 6715 - 4915 = 1800).
Relay pins 5 and 6 are not connected internally.shown in the RESET position in schematics.
80m K2, K3
= On bottom of PC board.
30m K3, K4
15m K5, K6 12m K6, K7
160m K2
20m K4 17m K5
10m K7
Integrated Circuits
K2 Schematic Key
11915 (subtract)
14915 (subtract)18915 (subtract)22915 (subtract)
Special Symbols
Total Cap., pF*
6715 (subtract)8415 (subtract)
Fixed Cap., pF at band edge**
K13, K14, K15
K13, K14, K15
Transistors
Relay Table
16085 (add)
VCO Freq.
23085 (add)19975 (add)
W. Burdick
Appendix B
SET Relays
VCO Table
Elecraft
E.Swartz
K14, K15
K13, K15
K13, K15 MPS5179
2SC2166
2SC1969
160m-K1
525-629325-429
102-131
ZVN4424
PN2222A2N7000 2N5109
1 of 1
82-111
2N3906
Diodes
Rev. Sht.
55-8435-64
55-8435-64
Date
J310
Band
Band
BPF LPF VCO
K11K11
K13
K15
K12
K10K10
40m
By
K8
K9K9
SG D E B C
SGD
CB
E
CB E
C
-
1Nxxxx
MV209, 1SV149
CLOCKWISE (8-PIN DIP SHOWN)
PIN 1 AND GOING COUNTER-
COUNT PINS STARTING AT
(DUAL-INLINE PACKAGE)VOLTAGE REGULATORS
2930T-8, 78XX
PLASTIC DIP
GNDOUT
GND
OUT
GND
IN
IN
1234 5
678
78L05, -06
Jumper
K13, K14K12 K1 K1, 60m-K1
60m 10165 (subtract)215-259
5250 kHz used as 60-meter lower band edge (pending U.S. FCC ruling).
K12 K14K13, K14
NOTE: All relays are single-coil latching type and are
K1 40m*40m ALT
11915 (subtract)
160m C75 (470)80m C72 (270)
30m C73+C74 (67) 20m C74 (20)17m none (0) 15m C73 (47) 12m C74 (20) 10m none (0)
D 10/23/02
C71+C73 (129) C71+C73 (129)
* This includes capacitance of varactor diodes D23-D26 on all bands, D21-D22
C71 (120)163-209154-203
*40m ALT applies if D19-D20 are not installed.
***40m ALT applies if D19-D20 are not installed.
***40m ALT
+60m
+ 60 meters is available only if the K60XV option is installed.
on 80 -160 m, and D19-D20 on 40 and 60 meters (if applicable). Only a
a total inductance of 0.95 µH (T5 in parallel with L30).
(S0 through S23 connected to DS1; only S0 and S23 shown)
First switch label corresponds to switch TAP,Second label corresponds to switch HOLD.
VIM-838-DP 8-DIGIT LCD
(based on LED Vf=1.9V)
K2 Front Panel Board
Pushbutton Switches
To RF Board, P1
RIT/XIT Offset
Shaft EncoderKeyer Speed
W. Burdick
6B595
LCD Driver
Backlight
6B595
Power Out
LED Array
R.F. Gain
E. Swartz
Elecraft
PRE/ATTN
1B
,C,D
P
1F
,E,A
N
2B
,C,D
P
2F
,E,A
N
3B
,C,D
P
3F
,E,A
N
4B
,C,D
P
4F
,E,A
N
5B
,C,D
P
5F
,E,A
N
6B
,C,D
P
6F
,E,A
N
7B
,C,D
P
7F
,E,A
N
8B
,C,D
P
8F
,E,A
N
PCF8566
CLK
INH
5K (audio taper)
74HC165
(spare)/MIC
RD
/MIC RD
68.1K, 1%
/SPD RD
PN2222A
DISPLAY
/SR RD
1 of 1
1A
,G,D
2A
,G,D
3A
,G,D
4A
,G,D
5A
,G,D
6A
,G,D
7A
,G,D
8A
,G,D
SR
WR
T
/SR
CLR
1N5817
SR DIN
/BA
NK
1
SR
DIN
SR
WR
T
/SR
RD
/SR
CLR
2N3906
/NIGHT
V POTSA
UX
BU
S (
NC
)
/BANK1
/BANK2
/BANK2
ANT1/2
RECALL RF/ALC
CW REV
/BANK1
Rev. Sht.
/SY
NC
SR
CK
SH
/LD
SR CK
EN
C A
EN
C B
SR
CK
EN
C A
EN
C B
BAND+
BAND-
STORE
LEVEL
SPLIT
Date
CO
M1
CO
M2
CO
M3
CO
M3
CO
M2
CO
M1
VLC
D
.047
ICLK 100KIDAT
SR
CK
SO
UT
100K
ICLK
IDA
T
LEDs
SR
CK
SO
UT
FUNC
4.7K
4.7K
MENU RATE
MODE
XFIL
TUNESPOT
EDITLOCK
AFIL
DS1
SD
A
SC
L
CLK
VD
D
OS
C
SA
0
VS
S
BP
0
BP
2
BP
1
BP
3
S1
0
S1
1
S1
2
S1
3
S1
4
S1
5
S1
6
S1
7
S1
8
S1
9
S2
0
S2
1
S2
2
S2
3
DS2
5K
5K
5K
S11
S15
S13
CLK
SE
R
/QH
GN
D
VC
C
.01
S16S14
S12
S10
.01
120
RP2 120RP1
RC
K
SIN
GN
D
VC
C/Q
0
/Q1
/Q2
/Q3
/Q4
/Q5
/Q7
/Q6
GN
D
GN
D
ccw
ccw
ccw
ccw
SR
DO
UT
S23
S10
S11
S12
S13
S14
S15
S16
S17
S18
S19
S20
S21
S22
S23
R14.01
Mic
PTT
GND
.01 .01 .01
RC
K
SIN
GN
D
VC
C/Q
0
/Q1
/Q2
/Q3
/Q4
/Q5
/Q7
/Q6
GN
D
GN
D
.01
GND
RP3
RP3
R13
RP3
RP310K
10K
10K
5K
ccw
R11
220
R9470
A/B A=B
AGC
RIT XIT MSG
VOX REV
PF1 PF2 REC
S8S2
S3
U2
C2
33
By
1015202530
A0
A1
A2
10 15
S0
S1
S2
20
S3
21
S4
S5
S6
S7
25
S8
S9
303540
U1
20
10
5A
R3
R4
R2
R5
R10
V-
V+
Z1
S6
S4
S1
S5
S9
15
10
11
12
13
14
QH
16
5A
C9
C1
5A
5A
11 12 13 14 15 16 17 18 19
R12
10
10
12
13
/G
14
15
16
17
18
101119
U3
D5
D6
cw
cw
cw
cw
S0
S4
S5
S6
S7
S8
S9
5A
S7
C8
J2
AF
DN
UP
5V
C4 C5 C7
5A 10 11 12 13 14 15 16 17 18 19 20
J1
5A
D2 D3
5A
12
13
/G
14
15
16
17
18
101119
U4
C6
Q3
R1
D4
cw
5A
Q1 Q2
R7
R6
5A
S3
S2S1
S0
NB
D2 D5
D6 D1
D7 D0
D4 D3
D5 D2 D6
D1 D7 D0
D0 D1 D2 D3 D4 D5 D6 D7
D3
D4
#1 #2 #3
#4 #5 #6
#8 #9#7#0
123456789
1 2 3 4 5 6
7
1 5
4 3
B
2
A
1
1 2
A B C D3
E4
F5
G6
H
79 8
1
2 3 4 5 6 7 8 91
23
45
67
89
9 8 3
42
5 6 7
12
34
56
78
1 2 3 4 5 6 7 8 9
9 8 3
42
5 6 7
6
5
4
3
2
1
8 7
R16 R15
15K 10K
.047
C3
BargraphBrightness
Control
/SP
D R
D
V POTS
SR
DO
UT
V POTS
MIC AF
/DOT-PTT
4.0V DAY (18mA/LED)2.7V NIGHT (6mA/LED)
Mic Config.
AF Gain
/BA
NK
2
5A
P1
1
2
3
4
5
6
7
8
2V
/BANK1 /BANK2
/ENC RD
Appendix B
These components are supplied with SSB adapter.
S7 - S16 can also be used as a numeric keypad.
C 10/6/02
Note: Current sense resistor
8V Low-Dropout Reg.
K2 Control Board
Voltmeter Input
Quad, 8-bit DAC
To RF Board, J7 To RF Board, J8
To RF Board, J6
Current Sense
Voltage Sense
8V Switching
100kHz-40MHz
V BIAS-XFIL
V B
IAS
-XF
IL
(0.1V res.)
W. Burdick
LMC6482AIN
0.00-5.10A
Freq. Ctr
E. Swartz
LM2930T-8
/SLOW AGC
1.78k, 1%
5.1K
Elecraft
4.000MHz
5.068MHz
LM380N-8
/AGC OFF
SID
ETO
NE
806K, 1%
196K, 1%
SR DOUT
/DAC2CS
5V Reg.
MPS5179 MPS5179
5V FCTR
V SENSE
I SENSE
PN2222A
0-25.5V
V RFDETS
R D
OU
T
/DA
C2C
S
SR WRT
MAX534
SR DIN
LMC660
V POTS
/PLLCS
/SR RD
/SR
RD
SR
DIN
1N4148
BY
PA
SS
AF Amp
AF OUT
2N3906
2N3906
1N4148
AUXBUS
12V IN
2N7000
SR
WR
TV
PO
TS
12V
IN
AU
XB
US
AF
OU
T
/PLLC
S
AF
OU
T
LMC660
V SMTR
V SMTR
1 of 1
Rev. Sht.
/LDAC
SR CKV BFO
ENC B
/MUTE
/DASH
.00272.2µF
NE602
LM833
/DAC1CS
220µF
220µF
100µF
78M05
ENC A
COUNT
SR
CK
EN
C B
V B
FO
EN
C A
V A
LC
/DA
SH
/MUTE
V ALC
V PWR
V PWR
Input
Date
OUTB
OUTA
/CLR
DOUT
SCLK
DGND
AGND
OUTD
OUTC
8-50
U10D
82K
U10C
47K82K
U10BICLK
IDAT
/DOT-PTT
.001
22µF
2.7Ω
0 Ω0 Ω
J310 J310
VOL1
VOL2
.022
Mute
3.9K
3.9K
22µF
82K 82K
ICLK
IDA
T
VOL1
VOL2 /DO
T-P
TT.001
U10A
47K
.01
.001
REF
UPO
PDE
/CS
DIN
VDD
C21
C22
.01
RP2
RP3
RP2
PD
2P
D1
RP347K
RP347K
.01C35
C36
C33
12V
U2B
330
C10
.01
.01
3.3M
33K
U2A
.047
SCK
SDO
SCK
.047 C29C30
GN
D
IN1
IN2
GN
D
OU
T
C32
C260.1
C250.1
R20
R18R19
C27
C28
R16 12V
C23.01
R17 3.3M
RP1
RP1
RP733K
C15C13
12V
.047
C19
OUTGND
OUTGND
.01
C37C38
RP5 RP5
RP4RP4
C39
.01
.01
680
470
PD2 PD1
12V
.047
C16
U3B
R10
U3A
100
.01C17
.047
C14
SC
KS
DO
5.1K
AGC
12V
2.2µF
C11
RP3
RP65.1K
C31
C34
5A
5A
5A
By
10
11
12
13
14
15
16
U8
X2
5A
C41
33
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
P2
10
11
12
13
14
15
16
17
18
19
20
P3
12
1314
11
5A
8A
10
C7
C9
C8
U1
V-
V+
nc
X1
39
8A
C2
R2
D1
R5
8A
C6
v+
NC
U9
Q7Q6
10
Q18T
Q28R
Q3
Q4
TX
RXD2
P1
INU5
INU4
5A
C3
Q9 Q10
470
P6
J1
R9
R8
R7
1%
P5
Q11
8A
8R
8T
6
J2
8A5A
5A 8A
RP6
RP6
8A
C1
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
+
-
4
98
+
-
5
67+
-
+
1
2
3
4
5
6 7
86
5
7
+
- 3
2
1+
-
8
4
12345 6 7 8
+
+
GD
S
GD
S
+
1
1 2 3 4 5 6
2
1
++
21
12
1 2 3 4 5
5
67+
-
2
31-
+
8
44 3 2
5 6 7 8
3 4 5
8 7 9 10
5 6
1 2 3
3
21
+
-
2 1
12
RP5470
C40 .01
RX
TX
R.F. GAIN
I.F. OUT
8R
is R115 on the RF board.
RXD
V AGC
82K
RP4
5 6
82KRP4
8 7
5A
10
1 2
3 4
5 6
7 8
9
P4Aux I/O
12V
8TRXD.0027C12
R6100
AUXBUS
AUXBUS
/AGC OFF
A u d i oF i l t e r
270KR21
82KRP2
4 3
ALC
EX
T A
LC
V RFDET
EXT ALC
PN2222AQ8
8A C18 .01
C20
.001
8R
C5 .01
3 4
4
3
5
6
/EECS
7
8
V SENSE
I SENSE
47KRP3
8 7
+-
10
9
4 3
5 6
Q12PN2222A
8R 8T
TXD
RP733K
3
4
C24
.0027
10KR3
8R
5.1KRP6
12/SLOW AGC
0.47µFC4
+
5A
5A
RP733K
5A
Q5
RP733K
5 6
2N7000
TON
EV
OL
MCLR
OSC1
OSC2
RA4
RC0
RC1
RA0
RA1
RA2
RA3
RA5
RE0
RE1
RE2
VDD
VSS
RC2
RC3
RD0
RD1 RD2
RD3
RC4
RC5
RD4
RD5
RD6
RD7
VSS
VDD
RB0
RB1
RB2
RB3
RB4
RB5
RB6
RB7
RC6
RC7
10
15
20 21
25
30
35
401
5
U6
8
7
Appendix B
18C452
MCU
3.9KRP1
9
10
5.6K
R4
/HOLD
/CS
/WP
VSS
SCK
VCC
SDO
SDI
1
2
3
4 5
6
7
8
U725LC320
EEPROM
0.1C42
RP5470
9
10
(NOTE 1)
TXD
.001C43
P7
1 2 3
INTEXT
Voltmeter Source
5.1KRP6
8
7
R1
50K
AGC THR.
ccw
cw
820R12
R1147K
VOL3
VO
L3
L182 mH
= on bottom of PC boardNOTE 1: Jumpers are used at R18 and R19. They must be removed if the Audio Filter option is installed.
(.02 A resolution)
Not UsedC44
82KR22
22µFC45
+
("D3" on PCB) .01C46
*
*
Part of CW key shaping*mod; solder on back (see text)
1/27/04F
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 SynthesizerPLL Reference
0.05Ω, 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
. GA
IN
R.F
. GA
IN
Elecraft
MC145170
I.F. O
UT
/DAC2CS
LTC1451
1SV149
VFO ALC
PN2222A
Speaker
V R
FD
ET
SR
DO
UT
/DA
C2C
S
SR
DO
UT
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
WR
TV
PO
TS
12V
IN
AU
XB
US
AF
OU
T
/PLLC
S
AF
OU
T
SR
DIN
SR
WR
T
/SR
RD
AU
XB
US
V P
OTS
MIC
AF
TX VFO
Rev. Sht.
100K
MV209
OSCIN
PDOUT 100K
78L05
18µH
4.7µH
1.2µHRFC14
Power2.2µF 2.2µF
220µF
MV209
1SV149
100µF
SR
CK
EN
C B
V B
FO
EN
C A
V A
LC
/DA
SH
SR
CK
EN
C A
EN
C B
V A
GC
RFC1647µH
2.2K
10µF10K
Date
/ENB
DOUT
PH R
PH V J310
DOUT
VOUT
12µH
J310
100K
2.7K
10K
.001 .001
10K
10K
2.7K
R115
C105C106
C103
3.3M
C196
10K
ICLK
IDA
T
VOL1
VOL2
/DO
T-P
TT
ICLK
VO
L1
VO
L2
/DO
T-P
TT
IDA
T
.01
RFC10
2.7K
C100.001
C175
L31
1.8K
27K
10K
.01
C92
C93
C68
C67
C73
C63
C64
C65
C59C62
C58
C71 C72
C75
C74
.01
0.1
R35 R36
U6A
U6B
SCK
SDO
120
120
C84
C85
R21
270R20
RD
RC
SCK
SDO
FIN
DIN
CLK
VSS
VDD
R24 R25
R28
R17R31
0.1C86
R15
CLK
DIN
GND
REF
VCC
.022
OUT
VFO
C87RP2
Q17
R14
R13
560R12
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
D24R22
D17
.047
C60
R10
15KR33
RP2
12V
PD
2P
D112V
SC
KS
DO
12V
C94.047
C95
120
R30
1mH
C96
TP1
TP3
R19
.01
C2 C1
R9
U3
47
ByJ2
U4
U5
U8
X2
FR
10FV
11LD
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 8T8A5A
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
21+
-
8
4
1
2
3
4
5
6
7
8 9
5
67
+
-
GD
S
GD
S
1
2
3
4 5
6
7
8
+
1
2
G
D
3
26+
-
7
4
S
243
978
243
978
243
978
+
-
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
EX
T A
LC
100K
R16
1 2 4 3
4, 5
C90.047
/DO
T-P
TT
/DA
SH
8R
8T
Q23
82R113
2N70008T
8R
2, 3 1
Appendix BC1112.2µF
+
1MR18
D12
SB530
F1
RGE300
Aux. 12V
position. See relay table (key).
MV209D19D20
10KR29
VO
L3
VO
L3
1N4148
D8
~2Vpp
(NOTE 1)
Oscillator 12.090-12.100 MHz
(NOTE 2)
(NOTE 2)
C89
.001
RFC15
.001C91
5B100 µH
(NOTE 3)
NOTE 1: X2 is not used.
10K
12KRB
Rt
33KRA
88B
Thermistor
Thermistor Board
C8868
(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, 710KRE
4V
(replaces RP3 on PC board)
4V
1/27/04F
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.
N o i s e B l a n k e r
S S B A d a p t e r
BFO Buffer/Attenuator
2nd Xtal Filter
Post-Mixer Amp.
RP4, RP5: 100K
K2 RF Board
Product Det.
V BIAS-XFIL
W. Burdick
Attenuator
Xmit Mixer
Rcv. Mixer
NB BypassRF Preamp
Elecraft
E.Swartz
I.F. OUT
(Sh. 3)
1SV149
1SV149
MC1350
IF Amp
2N5109
2N5109
Buffer
LT1252
2 of 4
1N4007
1N4007
RX VFO
TX VFO
+14dB
Rev. Sht.
100µH
2.7K
2.7K
NE602
100µH
100µH
RFC11
RFC12
RFC13
4.7uH
NE602
V AGC
V BFO
MV209
TUF-1
-10dB
V ALC
Date
680
1.8K
C155
C161
C183
C185
C162
C160
C159
C141
C146
C184
C150
C167
2.7K
5.6
K
C151
.001
R1
11
C182
18
R112
C166
R101
C173
C176
100KC172
C177
C174
.022
C169
100K
100K
2.7K
C142C143
.01C145
100K
C181
100KR107
C154
C156
C153
C158
C178
C168J310
.01
C53
C54
C52
C55
0.1
AGC
.01
.01
.01 .01
220
R83
R80
R81
R85150.047
R82
.01
R76
R77
R75
.01
.01
.01
.01
R95
R96
82R94
R93
330
R92
U10
BPF
12V
12V
100
68
100
.01
K16
K17
0.1
U12
Q21
Q22
R97
L34
180
R90R88
R89
470
100
470
R84
X10 X11
D30 D31 D32 D33
D34D29
RP4 RP4 RP4 RP5RP5 RP5
.047
10K
J10
.01
0.1
220
820
U11
RP6
R100
390
D38
RP6
RP6
L3
3
D37
J11
.01
R73470R72
.01
R74
12V
RP6
.01D39
100
.047R91820
R78
.01
0.1
Q24
270
R99
.01
270
R98
TP2
R8
U9
R6R7
.01
By
X5
68010
4.7Ω
18
X6
820
33
V-
V+
R5
W5
33
22
8R
X7 X8 X9W2 W3
J9
V-
V+
82
8A
X3
X4
8R
D6
D7
10 11 12
T6
47
8T
68
Z6
22
J51234
5 86 7
1
2
3
4
5
76
8
3
26 +
-
7
4
24
3
97
8
24
3
97
8
1 2 3 2
1
2
3
4
5
6 7
8
34
8
7
1 2 3 4 5 6 7 8 9
1
3
2
4
1
2
1 2
3
4
GD
S
2
C164.01
1 2 3 4 5 6 7 8
J12
AU
XB
US
8R
+7dBm
XFIL OutXFIL In
SSB Control
Aux. AF
8R
AU
XB
US
8T
/DO
T-P
TT
MIC
AF
V R
FD
ET
V XFIL2
V XFIL2
4
1
2
3
T7
C157
.047
Q20
8T
12V
2N7000
C144100pF
D36
5082-3081
EXT ALC
C163
.01
1.8K
R79
8R
C165
.01
8A
5
6
2
1
4
3
6
5
1
2
3
4
5
6
13
3 1
PD2
PD1
41µH
Q122N7000
HI IP
C170
.047
Appendix B
4.917MHz
BFO
-5dB, Z= 150Ω
D29-D34: 1SV149
NOTE: If Noise Blanker is installed,
R88 and R90 must be removed,and R89 replaced with a jumper.
3.9K
R1145.6KR110
C186.01
Q25
C179100
PN2222A
4.9136 MHz Variable-Bandwidth Crystal Filter
D41
1N4148
D40
(NOTE 2)
(NOTE 1)
NOTE 1: Remove C167 when SSB Adapter is installed.
NOTE 2: D40 and D41 were added to improve handling of extremely
strong signals (from nearby transmitters). These diodes must be soldered on the back of the PC board (see text).
1/27/04F
RF Output Detector
Band-Pass Filters
I n t e r f a c e
Low-Pass Filters
X v e r t e r
K2 RF Board
W. Burdick
BPF Relays
PRE-DRIVER
VCO Relays
E. Swartz
Pre/Attn.
Elecraft
PIC16C72
(Sh. 2)
(Sh. 4)
(Sh. 4)
HI IP
80/160m
30m/80m
10m/17m
12m/15m
RX Ant.
1N4007
1N4007
Switch
20/30m
15/17m
10/12m
1N4007
3 of 4
50pF 50pF
5-30pF 5-30pF
5-30pF 5-30pF
AUXBUS
4.0MHz
Relays
Relays
Bypass
Bypass
1N5711
Rev. Sht.
100µH
100µH
47µH
78L06
Date
K11B
K10B
K11A
K10A
RFC1
RFC2
1K
RFC31K
MCLR
OSC1
OSC2
K1
2B
K12A
C218
C220
C222
C210
C212
C214
C108
1.5K
C107
C225
C226
C227
C197C199 C201
.001
C110
C109
C114
C113 C198 C200
C219 C221
C211 C213
C203
C202
C195
C223
C216
C207
C190 C191 C192
226Ω
C204
C139C140.001
.001
.001
100K
.001
LPF
33µH
XVTR
K9BK9A
.01
BPF
C77
1200 1800 1200
390680
330
100220 220
150
220
100
82
150
68
C30 C36
C33
K1A
K5A K5B
K1B
K8BK8A
C16
C19C25
C22
K4A K4B
C20
C24
C35C31
C42 C48
C45
K7A K7B
C47C43
T-R
R38
LPF
L11
L12 L13
.01
C34
C44 C46
C32
C21 C23
C11
C12 C15
L10
R67
.01
L16 L17
L25 L26
L18 L19
L23 L24
L21 L22
.01
.01
.01
R68
27 150
12 39
10 33
820
100 4.7pF100
820
1800
560 560
1800
330
47 3.3 pF
47
330
470
56
2.2
56
470
330
331
33
330
L20
47
120
K2A K2B80m
RA4
RC0
RC1
RA0
RA1
RA2
RA3
RA5
VSS
RC2
RC3 RC4
RC5
RC6
RC7
VSS
VDD
RB0
RB1
RB3
RB4
RB5
RB6
RB7
RB2
IN
K12
K8
C2
7
C9
C2
6K9
K13
K14
K15
K16
K17
C8
0
C8
1
R39
R64
C3
8
C4
9
C3
7
C7
9
C57
C82
100
C131200
C14
0.1
R69
C39
C4 C8
C6C7
L4
L8 L9
D9
D1
C5
D2
D4
C1
7
By
L1 L2
L3
Q2
8R
K3
K6
10
14 15
20
25
28
U1
Z5
U2
OUT
K21
K3
K1
K4
K5
K7
K6
K101
K11
1
1
10 11 12 13 14 15 16
J14
L5
1%
1%
W6
J13
P6
W1
2
4
3
2
4
3
9
7
8
9
7
8
9
7
8
9
7
8
9
7
8
9
7
8
9
7
8
2
4
3
2
4
3
2
4
3
2
4
3
2
4
3
2
4
3
9
7
8
2
4
3
9
7
8
2
4
3
9
7
8
24
3
97
8
24
3
97
8
1
5
10
10
10
10
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8
1
2
4.7µH 4.7µH
1 6 0 m /
R X A n t.
Aux. RF
12V6V
160RY
RXRY
RXRY RY COM
RY COM
2.7K
R66
V RFDET
D3
ZVN4424A
100K
R37
8R
8T
8R
AU
XB
US 6V
6V
4.7µH 4.7µH
4.7µH 4.7µH
1µH1µH
1µH 1µH
/CLASS AB
15µH
RFC7
C10468
1N4007
D5
8R
2.7K
R34
160RY
10KR65
6V
Appendix B
I/O Controller
D
S
G
J4Ant.
However, these pins may be connected to other relay pinsor to other components on either side of the PC board.
C17, C27, C195, C204, C207, C216, C223
.001
C208
1 2 3
J15
40/60m
60m
X
8TG
8T
C224.047
RF
G
20/30m
10/12m
15/17m
40/60m
C228 C229
56 220
C2812
C29
12
or 16F872
ALL RELAY BYPASS CAPACITORS ARE .001µF
20m/160m
1/27/04F
(NOTE 1)
NOTE2: Pins 5 and 6 of relays are not connected internally.
NOTE1: When the K60XV (transverter and 60 m) option is installed,C6 must be removed and J15 installed in its place, on the top side of the PC board.
Power Amplifier (PA)
12:8, FT37-43
9:3, FT37-43
K2 RF Board
PRE-DRIVER
Pre-Driver
W. Burdick
Elecraft
E.Swartz
2SC2166
(Sh. 3)
(Sh. 3)
2SC1969
2SC1969
PA Bias
PN2222A
PN2222A
2N5109
Driver
4 of 4
100µF
0.68µH
Rev. Sht.
4.7Ω
470
C117
C115
C133
1.5Ω
C119 C126
47µF
RFC5
10µH
1/2W
C127
C128
C129
C137
C122
RFC4
10µH
C124
RFC6C120
C130C121
C138
4.7K
C116
Date
0.047
.01
270
560
22Ω
R55
R56
R53
R54
12V
R42
R41
R43
R47
R46
R40
R45
R50
.01
4.7Ω
4.7Ω
0.1
R58
180
680
680
.0156
0.1
R49
120
.010.1
.01
Q11
Q13
R59 R61
R62
.047
2.7K
120
33
47
Q7
Q8
Q5
Q6
Z1
Z247
33
33
T1
T2
8T
By
3
41
2
3
41
2
+
+
C125
22µF
RFC810µH
RFC910µH
8
3
4
1
56
7
2
T4
LPF
C135.01
Q102N7000
V BIAS-XFIL
8T
C118
.01
2.7K
R44
C1310.1
8T2:3:1:1
G
S
D
R48120
+
R63
220
/CLASS AB
C A
D B
T3
Appendix B
BETTER EFFICIENCY AT 5W
NOTE: WIND T4 2:2:1:1 FOR
(SEE "MODIFICATIONS" SECTION)
1/2 W
100R60
1/27/04F
K 2 K I T C H A N G E S A N D M A N U A L E R R A T A R e v . F - 2, F e b . 26 , 2 0 0 4
P L E A S E R E A D T H I S I N F O R M A T I O N B E F O R E Y O U B E G I N A S S E M B L Y
Your K2 kit includes a number of recent upgrades to both hardware and firmware. These include:
Modified CW keying envelope to significantly reduce transmit bandwidth Limiting diodes on the receive I.F. amplifier input to cleanly handle nearby transmitters
operating on your exact frequency (characteristic of "HF Pack" style operation) Two new scanning modes, including "channel hopping" (among in-band frequency memories)
and "live scan" (unmuted scanning for use in locating very weak signals) Up to six transverter band displays Transverter address control to allow more than one transverter band to select a given XV-
series transverter Full support for the forthcoming K60XV option, which will provide 60 meter capability and
low-level transverter I/O (due in March, 2004)
Errata Items:
1. Page 47, right column, 2nd assembly step: This step was supposed to be on page 64, right column,just before "Assembly, Part III". Make a note on page 64 referring to the step on page 47.
2. Page 57, right column, 2nd assembly step: Change L31 from 12 µH to 10 µH.
3. Page 82, rear panel drawing: The illustration shows a new lower rear panel that includes holes fortwo additional transverter in/out jacks (RCA connectors). Your kit may not have this new rear panelbecause it was being phased into production at the time the manual was written. You can obtain thenew rear panel later if you plan to purchase the K60XV option (60 meters and low-level transverterI/O). Availability of this option will be announced.
4. Appendix A, RF board parts list, page 5: Change L31 from 12 µH to 10 µH. Also make this changeon the schematic (Appendix B, RF board sheet 1, upper left corner).
W. BurdickE. Swartz
ElecraftRev. Sht.DateBy
AntennaJ2
GND Post
30pF
1N5711 1N5711
3.3K
C1
C95
C87 C88
100
.001 .001
200
100K
R28
D16 D17
R29
R27R26
T4
E1
4
3
2
1
3
21+
-
U5A
5
6
7+
-
8
4
U5B
2SC2879
R35
R34
Q2
Q1
10
10
K1
K2
5
4
2
3
1
T1
4
5
2
3
1
T2
SWR Bridge
C83
C81
C80
C59
R20
R19
R39
D12
D11
RP12
1
RP1
4
3
D14
D13
C79
R25
C86
(SHEET 2)
N:111
RFC5
RFC4
RFC3
L16
C76
Q6
R14
R11
R21 R23
R22
300
L18
C82
LPF OUTLPF IN
.047
470
12PA
.01100µH
RFC1C75
R13100
0.1100µH
12PA
.039
1N4007 1N4007
C71.0018200V
C72.01
5R
100µH
ZVN4424
510K Q7
R12
C31.033
200V
C73.01
ZVN4424
180K
5T
90-150V
100µH 5µH
1N40071N5404
(not used)
10 0 ohms
0 uH
1W
3.9K
3.9KR24
C70.001
8.45K
1%
8.45K
1%
C69.001
VRFDET
C68
C67
.033
200V
C66
180
C64
1800
200V
C62 .047
C61 .047
C63 .047
C60 100µF +R9 10
2W
2W
22 3W0.1
C58 R38
22 3W0.1
1000s.m.
4700
4700
1.62W
1.6
2W
Z = 1:16
Z = 9:1
C53 .047
C52 .047
C54 .047
C51 470µF+
C56 .047
C55 .047
C57 .047
Z1
FB110-43
C49
.047C48
.047C85
.047
KPA100
1 of 2
Low-Pass Filters
Current Sense
LMC6482
3.09k, 1%
I SENSE
2N3904
U7A
100
R32
R30
1%
Q5
2
31
-
+
8
4
2
1
J312V, 20A
+-
R7 .005 ohms
PA
5VC89.01
LM358
5
67
+
-
U7BLMC6482
R6
R5
Q3
5B
Q4
MJE182
MJE182
15K
1K
Bias Set
D101N5404
0.6-0.9 V
D9
SB530
(Ext. Fuse) 12PA
("AUX 12V")
12CTRL
.01
2
1J5AF In C10
0.1
R2
2.7 ohms
T SENSE
2W
2W (jumper)
Ext. Spkr
12K2
GND
2
1
J1K2 RF
RF IN
GND
2
1
J4K2 12V
+-
("AUX RF")
AF
GND
C11
0.1
R32.7 ohms
1W
200V
3W
25V Q10 Q11
2N7000
SCALE
J6
1
3
2
3W
VREFL
VFWD
SP1Int. Spkr
FT50-43
FWD REFL
C330.1
C300.1
C340.1
(0-5 V = approx. 0-32 A)
EN
3
26+
-
7
4
8
U6
R153.3K
R163.3K
C65.01
VRFEN
EL5146C
(2 beads)
GND
SPKR
C77
.015
200V
RFC11
100µH
*
T44-2
L15
5µH T44-2
T-R Switch
High-pass Filter
RFC10100µH
T4-6T4-5
GND
*
= on bottom of PC board
TP2
Not on the PC board.
TP4
G 2/5/04
(jumper)
64
Low-Pass Filters
W. BurdickE. Swartz
ElecraftRev. Sht.DateBy
KPA100
2 of 2
PIC16C72
AUXBUS
78L05
MCLR
OSC1
OSC2
C23C25
.001
RA4
RC0
RC1
RA0
RA1
RA2
RA3
RA5
VSS
RC2
RC3 RC4
RC5
RC6
RC7
VSS
VDD
RB0
RB1
RB3
RB4
RB5
RB6
RB7
RB2
IN
0.1
10
14 15
20
25
28
U1
U3
OUT
1
5
12CTRL
5V
Q8
2N3904C46
.01
C44.01
C43.015200V
C42
.015
200V
C41100
R4100K
X1
18.432MHz
4
2
3
1 T3
7T bifilar
FT37-61
D6
D5
D8
D7
R1047
C40
0.1
C39
.01
C38
.01
12CTRL
12CTRLD4
D3C37.01
30V
D2
D1C36
.015
200V
80V
90-150V
High-Voltage Bias Supply
C35
0.1uF
4 MHz
C26
X2
335V
K3
K4
160m
K5
K6
K7
K8
K9
K10
K11
K12
12CTRL
VFWD
VREFL
5R
5T
I SENSE
RP1
3.9K
8 78R
C24.01
C12.01
C13.01
C14.01
C15.01
C16.01
C17.01
C18.01
C19.01
C20.01
C21.01
T SENSE
12
34
56
78
9
J8
T2O
UT
R2O
UT
R1O
UT
T1O
UT
T3O
UT
R3O
UT
R2IN
T2
IN
T1
IN
R1IN
R3IN
T3
IN
GN
D
VC
CV
DD
VS
S
16
12
14
15
13
11
10
23
9
18 5 47 6
U4
RFC8
RFC7
RFC6
RFC9
C84
C9
VRFDET
AUXBUS
8R
AU
XB
US
VR
FD
ET
C8 C7
C32
15µH
.001
C97.01
MAX1406
12CTRL
TXD
RXD
12
CT
RL
12CTRL
5V
-5 TO -25V
RS232 Interface
/K2
TX
/K2
RX
(BACK VIEW)
1 2 3 4 5
6 7 8 9
10
1
2
3
4
5
6
7
8
9
P1To Ctrl Board
Q9
IRF830 or IRL620
K2
C22.01
J7
D1-D8 = 1N4148
All relays are shown in the RESET (de-energized) condition.NOTES:
= on bottom of PC board (nearest the heatsink).
200
R31
C90
.01
Ext. PA Key
Aux I/O
17/20m
80m
/OUT0
/OUT1
/OUT2
/OUT3
/OUT4
/OUT5
/OUT7
/OUT6
COM
IN5
GND
IN7
IN6
IN4
IN2
IN0
IN1
IN314
13
12
11
10
18
17
16
15
3
5
9
8
7
6
1
2
4
U2
TD62083
or ULN2803
12CTRL
5B
nc
8T
(N
C)
M
FANFAN+ FAN-
J8
RP156
3.9K
1/2W
L13 L14
C6AC6D C6FC6B
C6C
C6G
L4 L5 L6
C3E C3H
C3GC3CC3JC3BC3A
L7 L8
C4D
C4EC4C
C4BC4A
L10 L11 L12
C5D C5F
C5EC5C
C5GC5BC5A
K3
K5
K7
K9
K11 K12
K4
K6
K8
K10
LPF OUTLPF IN
SCALE
30pF
C27
K1
C29.01
C28.01
L1 L2
C2D C2E
C2C
C2BC2A
S.M.
S.M.
S.M.
C3D C3F
S.M.
C6E
RFC6-8: 100 µH
C7-C9, C32: .01 µF
MCU
C74.01
C98.01
C99.01
30/40m
10/12/15m
TP1
BIAS SET TEST POINT
VRFEN
Q12
2N7000R8
10K
S
D
G
12PA
12PA SENSE
nc
G
D
SR1
3.3K
C13-C21
TP3
G 2/5/04
65
K2 /10 0 M A N U A L (A p p en d ix G) ER R A T AR e v . C - 3 , D e c e m b e r 1 4 , 2 0 0 4
P L E A S E R E A D B E F O R E Y O U B E G I N A S S E M B L Y
Important Notice
Your KPA100 kit includes recent circuit changes that allow the K2/100 to handle highermismatch conditions, allowing power reduction to start at an SWR of 2:1 rather than1.5:1.
Since your kit is one of the first shipped with these enhancements, it may include anunused toroid core, a few extra resistors, and an extra capacitor (the previous componentvalues).
Errata Items
1. Page 7, parts list: Change R4 from 100 k to 39 k. (Your kit may include anunneeded 100 k resistor.) Add resistor R33 to the parts list (1 k, 5%, 1/4 W, BRN-BLK-RED).
2. Page 13, left column, 2nd assembly step: Change R4 from 100 k to 39 k.
3. Page 13: Cut out and tape this assembly step at the bottom of the right column:
__ Locate a 1 k, 1/4-watt resistor (R33). Trim R33’s leads to approx. 1/4” (6 mm)long. Place the resistor across the leads of RFC3 (RFC3 is near the fan and the largeblack RF choked marked “101”). Solder the resistor to RFC3’s leads.
4. Page 24, left column, first paragraph: The second sentence in this paragraph shouldbe replaced with: "Each toroid is wound on a specific type of core. One example istype T44-2."
5. Page 24, right column, first assembly step: The reference to a T50-2 core in thisparagraph should be changed to T50-10.
6. Page 47: Cut out and tape this test step at the bottom of the left column:
__ Set your DMM for 200 or 300 VDC full-scale. Connect the (-) lead of the DMM toground (one of the KPA100 standoffs). Be ready to touch the (+) lead to the left sideof 180-k resistor R12 (the lead closest to RFC5). Turn on the K2 and select CWmode. Set the power knob above 11 W. Hold the MODE button down 1-2 seconds toenter CW TEST mode. Press the TUNE button and verify that the DC voltage at theleft side of R12 is 100-110 VDC or more. Exit TUNE by tapping any button. ExitCW TEST mode by holding down the MODE button.
7. Schematic: On page 64, add R33 (1 k) across RFC3, in the T-R switch. On page 65,change R4 from 100 k to 39 k in the High Voltage Bias Supply.
24
SSB Crystal Filter
Compressor
W. BurdickE. Swartz
Modulator
Elecraft
Balanced
BUF OUT
SSM2165
4.0 MHz
Speech
VCA IN
AUXBUS
AF IN
100µH100µH
Rev. Sht.
OUTB
COMP
RFC1
2.7K
RFC2
2.7K
Date
2.2µF
SCLK REF
OUTA
OUT
AVG
GND VDD
X1 X2 X3 X4 X5 X6 X7
CA CP
CC CE CH CMCG CKCB
CD CL
CN
RP1
T1
T2
.01
RP2
.01
.01
.01
.01
.01
.01
.01
D3
C39 C42
C14
C32
RP3
C33
470
C27
C31
MCU
/CS DIN
VDD
GND
C20
U4
10 11 12
P1
U3
V-
V+
U5
D10
D12
D11
D13
C2
C3
P2
C5
C1
D8
D6
D7
D9
C8
C9
P3
C11
C7
By
R12
6V
Z1
6V
U2
1 2 3 4 5 6 7 8 9
5
6
7
81
2
3
4 1
2
3
4
5
6 7
8
4
1 2 3
1
2
3
4
3 2 1
+
5
6
7
81
2
3
4
3
21 +
-
8
4
RP3
C10
C24
2K
2K
L1
22µHC25
22pF
C26
.01
D4
1N4148
DSB
R6
C12
2.7K
DSB
/PTT
AUXBUS
C36
C37
R5
C6
RXS
/VOX DET
MAX522
LM393
NE602
C22
.01
MOD EN
0.1
78L06
OUT
GND
C46
IN
U6
6V
0.1
22µF
0.33µF
+
.01
.01
820
.001
.01 .01
470
.01.01
.01
+
C21
.01
4.915MHZ
MOD EN
/COMP0
/COMP1
/COMP2
RXC
RXS
K2 SSB Adapter
DAC
CF CJ
6
5
8
7
3
4
1
2
RXS
RXS
C13
0.1
TXC
4
3
6
5
0.1
RXC
C4
0.1
39
0 27
(short)
39
100
39 39
100
39
(short)
27 0
39
8V
8VMIC AF
C34
2.2µFMIC AF
D2
Q1
ALC THR
R9
10K
/PTTPN2222A
ALC
C30
820
R14
1K
R1+
1M
TXS
R11
150
D14
TXS
Q3Q2
PN2222A PN2222A
RP3
2K
1
2
8T
8T
VRFDET
TXC
C41
.01
R2
5.6K
/COMP1C18
0.1
R15
180
ALC
/ATTEN
C23
+
0.33µF
RP5
47K
6V
R10
100
C40
.01
R4
56K
C38
+
47µF
1N4007 1N4148
C43
.01
PWR CTRL
ALC THR
.01
C35
SSB
D1
R7
33K
R8
100
PWR CTRL
.01
C44
1N4007
ALC
C15
0.1
C16
.01
COMP OUT
= On bottom of PC board.
PN2222A 78L06
GNDOUT INE B C
CLOCKWISE (8-PIN DIP SHOWN)
PIN 1 AND GOING COUNTER-
COUNT PINS STARTING AT
(DUAL-INLINE PACKAGE)
PLASTIC DIP
1
2
3
4 5
6
7
8
8
7
6
5
2
1
4
3
COMP OUT
5
67 +
- /PTT
PTT DET
6V
CARRIER
BALANCE
C17
.01
SSB
/ATTEN
C19
.01
16
1
1
1
3
4
5
/COMP0
/COMP2
1 of 1
D6-D9 1N4007
3 1
2
D10-D14 1N4007
R16
10K
D5
1N4148
MCLR
OSC1
OSC2
RA4
RC0
RC1
RA0
RA1
RA2
RA3
RA5
VSS
RC2
RC3 RC4
RC5
RC6
RC7
VSS
VDD
RB0
RB1
RB3
RB4
RB5
RB6
RB7
RB2
10
14 15
20
25
281
5
U1
16F872
F 7-20-04
Elecraft www.elecraft.com 831-662-8345
Elecraft SSB B/W Modification (SSBCAPKT)
Installation Instructions
Revision A, November 9, 2004. Copyright © 2004, Elecraft; All Rights Reserved Parts Inventory
P/N Description QTY E530016 100 pF, 100V,5%,NPO,0.1LS, CAP 2 EA E530049 150 pF,100V,5%,NPO,0.2LS, CAP 2 EA E530141 27 pF, 200V,5%,NPO, 0.1LS, CAP 2 EA E530144 33 pF, 50V, 5%, NPO, .1LS, CAP 4 EA E530152 39 pF, 50V, 5%, NPO, .1LS, CAP 6 EA
Introduction The Crystal Filter Bandwidth Modification capacitor kit provides two options to change the original 2.1 kHz
6 dB bandwidth of the KSB2 SSB filter to either 2.4 kHz or 2.6 kHz. (Note: KSB2s shipped after July 12, 2004 now include the 2.4 kHz bandwidth components.) These modifications are not required for the K2 to function well in the SSB mode. Instead, they are intended for those who wish to optimize its performance to their personal preferences.
The 2.4 and 2.6 kHz bandwidth filters also require better matching of crystal motional inductance to minimize pass-band ripple. We have worked with our supplier to obtain crystals with better control of the motional inductance. The latest ones now make it possible to increase the SSB filter bandwidth up to 2.6 kHz. The latest crystals (shipping with all KSB2s since May 2002) are marked with “ECS 4.9136-S” on each crystal. Older crystals shipped before May 2002 marked with “ECS 4.91-20” or “ECS 4.91-0195” should be replaced when performing this modification.
The older crystals work fine at a 2.1 kHz bandwidth, but are not optimum for wider bandwidths. If you want to add a wider SSB bandwidth enhancement to your KSB2, we suggest you order a new set of crystals from Elecraft. They are Elecraft Part #E850006 (7 matched crystals for the KSB2) or #K2KSB2XTLS (14 crystals for the KSB2 and the K2 CW filters.) See our spare parts order page at http://www.elecraft.com/order_form_parts.htm
Removing parts from the KSB2 The KSB2 is designed with much smaller pad sizes than the other boards in the K2 transceiver. For this reason
it can be more difficult to remove parts without damaging the board. If you don’t have a desoldering tool, cut the leads off the part and then pull out each piece of wire individually. You will lift pads on the KSB2 if you try to remove capacitors in one piece. Sacrifice the part and save the board. Crystals may be removed by desoldering the grounding lead on the top and then wiggling the crystal out by alternately heating each pad on the board.
The best way to remove parts from a KSB2 is to use a Hakko 808 (or equivalent) de-soldering tool. If you are interested, the Hakko 808 and tips for it are available at http://kiesub.com/hakko808.htm .
Crystal Filter Bandwidth Modification The KSB2 filter as designed has a 2.1 kHz bandwidth. The response of a crystal ladder filter can be adjusted by
changing the capacitors in the filter. The most critical capacitors are the ones that connect to ground between each pair of crystals. These capacitors set the coupling between the filter sections. The capacitors in series with a crystal modify the resonant frequency of each section, but are not nearly as critical in value.
Elecraft www.elecraft.com 831-662-8345
The wider bandwidth filters require that the BFO be tuned to a higher frequency for receiving USB on the lower bands. For the 2.4 kHz bandwidth, the BFO must be able to reach approximately 4916.5 kHz and for the 2.6 kHz bandwidth it must reach approximately 4916.8 kHz. Be sure and check your maximum BFO frequency before attempting to use a wider filter bandwidth. To measure BFO frequency, attach your K2 frequency probe to TP2 and use CAL FCTR to read the BFO frequency. While in this mode, press BAND UP to set the BFO to its max frequency and BAND DOWN to set it to its minimum frequency. It may be possible to increase the maximum BFO frequency in a K2 by removing turns off of L33 or changing capacitor sizes without raising the minimum frequency too high. Contact [email protected] if you have questions regarding changing the maximum BFO frequency.
The following table shows the new capacitors for each reference designator (CA, CP etc.) on the KSB2 board. Remove the old capacitors and install the new ones as indicated for your chosen bandwidth in the table. If necessary (as noted above) also remove and replace the crystals.
After installation you will need to re-optimize your USB and LSB transmit BFO settings (BF1t) in CAL FIL. See ‘Transmit BFO Optimization’ on page 22 of the latest KSB2 manual. (Available on our manual download web page at http://www.elecraft.com )
Nominal BW
(kHz)
Predicted 6 dB BW
(kHz)
Predicted Loss (dB)
Predicted Ripple (dB)
CA,CP (pF)
CB,CN (pF)
CC,CM (pF)
CD,CL (pF)
CE,CK (pF)
CF,CJ (pF)
CG,CH (pF)
Original 2.1 8.3 3.2 100 10 33 Short 47 56 47 2.4 2.4 7.5 1.5 39 Open 27 Short 39 100 39 2.6 2.65 7.3 1.9 39 Open 27 Short 33 150 33
App. Note: Using Spectrogram to make filter measurements Spectrogram ( http://www.visualizationsoftware.com/gram.html ) may be used to measure the response of the
K2 filters with your PC sound card. To make a measurement of a K2’s filter, use the following procedure:
1. Connect a noise generator to the antenna input of the K2 (Elecraft N-gen etc.). Using antenna noise for this purpose will be much less accurate.
2. Connect the audio output of the K2 to the sound card input on a PC. If you use the headphone output of the K2 for this purpose, be sure to place a 10 ohm resistor to ground to avoid rolling off the high frequencies due to C105/C106.
3. If your K2 has a KAF2 or KDSP2 installed in it, be sure to put it in bypass mode. If left in line, the higher audio frequencies will be attenuated and will decrease your amplitude measurement accuracy.
4. Set Spectrogram at Scan Input to 22k Sample Rate, 16 bit Resolution, Line Plot, 90 dB Scale, 1024 FFT, and Average Count to 32. Then press OK. Move the slider at the right to the top of its range. The displayed spectrum should not exceed –30 dB or you risk overloading the sound card input.
5. Set the K2 to 7100 kHz. Turn AGC Off. Set the AF Gain to about its mid-point. Select the filter for which you wish to measure its frequency response. Adjust the RF Gain so that the maximum level displayed is –30 dB or less.
6. If you wish to see the KSB2 SSB filter response without it being modified by the K2’s 2nd Xtal Filter, place 0.1uF caps across X5 and X6 on the RF Board.
7. When you have completed the measurements, return the KAF2 or KDSP2 , if present, to its normal mode.
8. Spectrogram provides an easy way to look at the filter responses of all of the K2’s filters. You are limited to a dynamic range of less than 60 dB. The noise fluctuations will be several dB, but you can reduce this by increasing Average Count to 128. Additional reductions can be accomplished by averaging several sets of readings.
11
K160RX Schematic
W. Burdick
E. Swartz
Elecraft
Rev. Sht.Date
C1 C2 C31500 2700 1500
By
L1 L2
2
4
3
9
7
8
K2
10 11 12 13 14 15 161 2 3 4 5 6 7 8 9
J1
2
4
3
9
7
8
K1
160m/RX ANT. Module
1 of 1
160m Low-pass Filter
To RF Board, P12
GND
RX ANT.
(Note 1)
K2 K1
C5
.001
C4.001
1 110 10
NOTES:
a separate receive antenna. Refer to manual for operating instructions.
Receive Antenna Relay
RY C
OM
MO
N
C6.001
RX R
Y
160
RY
A
1. Remove RF board jumper W1 before using
8-17-99RESET position.2. K1 and K2 are latching relays, and are shown in the
RX
Elecraft • www.elecraft.com • 831-662-8345
Circuit Details
U1 amplifies the I.F. signal, which is then detected by D2 (1N34A). Q1 reduces the gain of U1 in proportion to overallsignal strength, keeping the signal at D2 relatively constant. Negative-going pulses that are above the thresholdestablished by D3 and R3 turn Q2 on, triggering the one-shot (Q3/Q4). Q6 can be used to switch in a larger-valuecapacitor, increasing the blanking time. The pulse output of the one-shot (GATE) saturates Q5, attenuating the signal atthe output of the band-pass filter. The band-pass filter creates a small delay between input and output, so that the GATEsignal arrives just ahead of the noise pulses. The controller, U3, decodes auxBus commands from the main processor. Itthen controls power to the blanker (via Q7), pulse width (via Q6), and blanking threshold (via R3).
= On bottom of PC board.
KNB2 Noise Blanker
Band-Pass Filter
To RF Board, J12
0V = NARROWPULSE WIDTH
W. Burdick
Noise Gate
E. Swartz
Pulse Amp
0V = HIGH
6V = WIDE
6V Switch
THRESHOLD
Elecraft
One-shot
6V = LOW
6V = OFF
PN2222A
0V = ON
2N3906,
PN2222A
PN2222A
MC1350
1 of 1
AUXBUS
RF Amp
RF
OU
T
2N3906
2N3906
2N3906
2N3906
2N7000
12C509A
40 µH
2N7000
78L06
Rev. Sht.
1N34A
1N34A
78L06
1 0 0
Date
1.2 µH
.001
3 9
.0068
.001
22µF
3.9K
100K 3.9K
1.8K
3.9K
3.9K
3.9K
3.9K
3.9K
2.7K
1.2 µH
3.9
K
GATE
GATE
C10
AGC
1 8 0 0
0.1
OUT
GP5
GP4
VDD
GP3 GP2
GP1
GP0
VSS
RP1
RP1
RP2
RP2
RP1
C15
12V
.001
C13
.01
C14
6NB
6NB
6NB
6NB
RP2
C16
RP2
C12
ALC
C112 2 0
2 2 0
RP
1
GNDOUT
2 2 0
.01
1 5 0 0
IN
U1
C7
C4 C6
U2
By
U3
Q6
Q1
Q2
Q4
Q3
L3
R1
R4
R6
P1
L1 L2 Q7
C9
R7
R3
D2
6V
6V
D3
IN
R5
Q5
C8
1234
5 86 7
5
6
7
81
2
3
4
1 2 3 4 5 6 7 8
+
2
1
S D
G
3 4 6
5
4
3
2
1
5 67
8
7
8
SG D E B C
MC1350, 12C509A
1234 5
678
Controller
1 M
R10
3 0 0
R9
1 2 0
R8
8 2 0
C3
.01C17
(-6 dB)
D 8 - 1 9 - 0 2
7
(+)(-)
3" Red7.5" Red
7"Black
12"Red
Detail B
Figure 3
23
Circuit Details, KAT2 L-C Board
The L-C board provides eight series inductors and eight parallel capacitors, configured as an L-network. Thecapacitance can be placed at the transmitter or antenna end of the network via a relay on the Control board (see nextpage). Each inductor and capacitor has its own DPDT relay, with the individual sections of each relay placed in parallelfor reliability. The relays are selected under control of the ATU's microcontroller. Latching relays are used so that theywill not consume any power except when the operator is actually tuning. The relays are switched one at a time to keepswitching current low and to provide acoustically and electrically quiet operation. This results in somewhat longer tunetimes.
For additional reliability, the connectors used between the L-C and control boards have gold-plated contacts, andredundant pins are used for RF signals. Bypass capacitors are used on relay control lines to prevent RF signals fromreaching the microcontroller.
L-C Board Schematic
L8 is wound on T50-1 core (blue). All others are wound on T50-2 core (red).
= On bottom of PC board. All relays on the L-C board are on the bottom.
RELAY COMMON
W. BurdickE. Swartz
L-NET OUT
Elecraft
L-NET IN10.4 µH.64 µH 1.3 µH 2.6 µH 5.2 µH
Rev. Sht.
.08µH .16µH .32µH
Date
1200
.001 .001 .001 .001
.001
C1_2 C3_4 C5_6 C7_8
C7_8
C3_4
C5_6
C1_2
K12 K15 K16K13 K14 K10 K11
K10 K11 K12 K13 K14 K15 K16
150 300 620
C20
C23C22C21
C24C25
C26C27
C31C32
C33C34
C35C36
C37C38
C42
K5 K6 K7 K8
P4 P5
By
10
K1
10 10
K2
10
K4
10 10
K9
10
K3
10 10 10 10 10 10 10 10 10
10 11 12 13 14 15 16 10 11 12 13 14 15 16
L1 L2
K2
L3 L4
K4
L5 L6
K6
L7 L8
K8
K9
C1 C2 C3 C4 C5 C6 C7 C810 22 39 82
K1 K3 K5 K7
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
243
978
243
978
243
978
243
978
243
978
243
978
243
978
243
978
243
978
243
978
243
978
243
978
1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9
2 43
9 78
2 43
9 78
2 43
9 78
2 43
9 78
*
*
X Y
X Y
1 of 2
KAT2 ATU L-C BoardPins 5 and 6 of each relay are used as tie points but are not internally connected.
NOTE: K1-K18 are single-coil latching relays, shown in the RESET position.
F 11/27/00
24
Circuit Details, KAT2 Control Board
T1, D1, D2 (etc.) form a directional coupler for SWR and power measurements. This type of bridge is much moreaccurate than the K2's standard RF detector (D9) in the presence of non-50-ohm loads. The bridge output is buffered byop-amp U4 and routed to the K2 control board, overriding the signal from D9. The bridge outputs are also connected toA-to-D inputs on the microcontroller, U1. U1 measures these voltages and converts them to SWR or power readings,using averaging and linearization techniques to improve accuracy. The EEPROM (U2) stores network and SWR datafor each band and antenna. K17 selects either a capacitor-in or capacitor-out network configuration, while K18 controlsthe antenna switch. U1 "sleeps" at all times except during actually antenna tune-up, so it generates no receiver noise.
Control Board Schematic
= On bottom of PC board.
C TX/ANT Select
AAAAnnnntttteeeennnnnnnnaaaa SSSSwwwwiiiittttcccchhhh
W. Burdick
SSSSWWWWRRRR BBBBrrrriiiiddddggggeeee
CAP COMMON
E. Swartz
Antenna 1
Antenna 2
L-NET OUT
L-NET OUT
Elecraft
L-NET IN
L-NET IN
GND POST
LM78L06
25LC320
5-30pF
4.0MHz
RELAYCOMMON
Rev. Sht.
1N5711 1N5711
16C77
/HOLD
Date
REFL
.001
3.3KM
CLR
OSC
1
OSC
2
REFL
.001
.001
.001
C55
C54
C50 C51
100
.001 .001
C52 C53
200
K18
FWD
0.1
OUT
C580.1C59
C57
.001 .001
100KK17
K18
GND
K17
MMMMCCCCUUUU
470
RA4
RC0
RC1
RA0
RA1
RA2
RA3
RA5
RE0
RE1
RE2
VDD
VSS
RC2
RC3
RD0
RD1
RD2
RD3
RC4
RC5
RD4
RD5
RD6
RD7
VSS
VDD
RB0
RB1
RB2
RB3
RB4
RB5
RB6
RB7
RC6
RC7
FWD
/CS
/WP
VSS
SCK
VCC
SDO
SDI
C45
C46
C47
.001C60
R3D1 D2
By
J1
J2R4
R2R1
10 11 12 13 14 15 16
J4
10 11 12 13 14 15 16
J5
U3
IN
Z1
1010
R F
R5
10 15 202125303540
U1
U2
6V
T1
E1
24
3
97
8
1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9
11
2 43
9 78
1 5
1
2
3
4 5
6
7
8
4
2
3
1
65
nc nc
2 of 2
KAT2 ATU Control Board
54
32
1
J3Aux I/O
(Sheet 1)
AUXBUS
12V
3
2
1 +
-
8
4
U4A
6V
LM358
6V
G
6V
A
B
5
67+
-
U4B
NOT USED
47R6
F 11/27/00
W. BurdickE. Swartz
Elecraft
10.4 µH.64 µH 1.3 µH 2.6 µH 5.2 µH
Rev. Sht.
.08µH .16µH .32µH
Date
1 2 0 0
0.1 0 .1 0 .1 0 .1
K11 K12 K14K2 K5 K8 K9
1 5 0 1 5 0 1 5 0
C10
C11
C12
C13
C17
C16
C15
C14
C19
C20
C21
C22
C26
C25
C24
C23
K10 K13 K15 K16
By
5
K1 K3 K4 K6 K7
5
L1 L2 L3 L4 L5 L6 L7 L8
C1 C2 C3 C4 C5 C6B C7B C8
1 2 2 2 3 9 8 2
2 2
C
L IN
0.1C9
0.1C29
KAT100 RF Board
1 of 2
L OUT
K13
14
K10
3
1
4
K23
14
K33
14
K43
14
K53
14
K63
14
K73
14
K83
14
K11
3
1
4
K12
3
1
4
K13
3
1
4
K14
3
1
4
K15
3
1
4
K16
3
1
4
6B595 6B595
/SR
CLR
/SR
CLR
SR
CK
SO
UT
SR
CK
SO
UT
0 .1
RC
K
SIN
GND
VCC
/Q4
/Q5
/Q6
/Q7
/Q2
/Q3
/Q1
/Q0
GND
GND
RC
K
SIN
GND
VCC
/Q7
/Q6
/Q0
/Q1
/Q2
/Q3
/Q4
/Q5
GND
GND
C48
12
13
/G
6 7 4 5 18
10
11
19
U3
12
13
/G
6 7 15
14
18
10
11
19
U2
9 8 3
14
2
15
16
17
9 8 3
17
2
16
4 5
6B595
/SR
CLR
SR
CK
SO
UT
RC
K
SIN
GND
VCC
/Q0
/Q4
/Q5
/Q6
/Q7
/Q2
/Q3
/Q1
GND
GND
12
13
/G
17
6 5 7 18
10
11
19
U4
9 8 3
42
14
15
16
5V
K17
2
5
0 .1C30K18
2
5
RYCK RYLOAD
R15
(Sheet 2)
*
*
1 5 0C6A
1 5 0C7D
1 5 0C7C
1 5 0C7A
C270.1
K9
3
1
4
RFC2
47 uH
0.1C52
0.1C53
12V
0.1C18
0.1C28
= On bottom of PC board.
= Components not supplied; for future use.
0 .1C54
(Sheet 2) (Sheet 2)
RYDATA
Note: All relays are shown in the N.C. position.
0 .1C55
/EOT
(Sheet 2)
/RS
CL
/FS
CL
12V
RY
SRTEST
0.1C59
Appendix A
B 1 / 4 / 0 3
W. BurdickE. Swartz
Antenna 1
Antenna 2
L OUT
Elecraft
L IN
7 8 0 5
25LC320
4.0MHz
Rev. Sht.
16F877
/HOLD
Date
MC
LR
OS
C1
OS
C2
10 µF
OUT
C420.1C43
MCU
RA
4
RC
0
RC
1
RA
0
RA
1
RA
2
RA
3
RA
5
RE
0
RE
1
RE
2
VDD
VS
S
RC
2
RC
3
RD
0
RD
1R
D2
RD
3
RC
4
RC
5
RD
4
RD
5
RD
6
RD
7
VS
S
VDD
RB
0
RB
1
RB
2
RB
3
RB
4
RB
5
RB
6
RB
7
RC
6
RC
7 /CS
/WP
VSS
SCK
VCC
SDO
SDI
By
J 5
J 6
U8
IN
Z1
10
15
20
21
25
30
35
40
U1
U7
5V
+
1 5
1
2
3
4 5
6
7
8
(Sheet 1)
(Sheet 1)RF IN
J 430pF
1N5711 1N5711
3.3K
C31
C32
C33 C34
1 0 0
.001 .001
2 0 0
100K
R2
D1 D2
R1
R4R3
T1
4
2
3
1
5
67+
-
U5B
3
2
1+
-
8
4
U5A
SWR Bridge
RP14
3
RP1
1
2
R7
1W
3.9K
3.9KR6
C35.001
8.45K
1 %
8.45K
1 %
C36.001
VRFDET
C39
5V C400.1
LM358
.01
VREFL
VFWD
FT50-43
FWD REFL
EN
3
26
+
-
7
4
8
U6
R83.3K
R93.3K
C38.01
VRFEN
EL5146C
TP4
Ground Post
12V DC
1N5817
D4
J 1
D3
P 3
1
2+-
Aux. 12V
C44.047
Q1
R1210K
R116 8 0
Q2
2N7000
12V
5V
(Sheet 1)
12
34
56
78
9
J 3Control
RFC1
C47
VRFDET
AUXBUS
15µH
.001
C46.01
(BACK VIEW)
1 2 3 4 5
6 7 8 9
10
1 2
3 4
5 6
7 8
9
P 4
Aux Control
C45.01
KAT100 RF Board
2 of 2
5V
R51 2 0
AUXBUS
12V
12CTRL
K17
3
1
4
K183
14
C
0.1C41
Aux RF InJ 2
P 6
12
Aux RF Out
J3
ANT1
ANT2
GND
GND
E 1
GND
Ant. Switch
1 0 1 1 1 21 2 3 4 5 6 7 8 9
P 5
W4
W3
5V/SW
CT
/CD
Front Panel
W5
W6
C37.01
R138.45K
*
RP1
5 6
3.9K
*
P 2
1 2
*
1 %
ZTX789A
1/2 watt
C49.047
C51.01
C50.01
VPS
VP
S
/FSCL /RSCL
R1610K
RFIN
P 1
1 2
FPD
ATA
FPC
K
FPLO
AD
FPLO
AD
FPC
K
FPD
ATA
IDA
T
ICLKRYL
OAD
RYC
K
RY
DA
TA
/SW
VS
WID
AT
ICLK
* = On bottom of PC board.
= Components not supplied; for future use.
AD
1
AD
2
1 2 3 4 5 6
J 7
AD
1
CT AD
2
/CD
* P 7
1 2
Note: All relays are shown in the N.C. position.
JUMPERS W1-W2: Both open = Auto. LED control; W1 = DOT; W2 = BAR
.047C56
0.1C57
0.1C58
VR
FEN
VFW
D
VR
EFL
W2
W1
R17 10K
R18 10K
SR
TES
T
0 .1C60
/ON
Q3
2N7000
RP1
7
8
3.9K
/ 8 R
/ 8 R
*
W7
/EOT
* *
** Test output -- n/c
G
S
D
GD
S
Appendix A
B 1/4/03
W3-W7: Leave open except as required (see manual).
W. BurdickE. Swartz
ElecraftRev. Sht. DateBy
1 of 1
5A
(based on LED Vf=1.9V)
PN2222A
.047
R116
2 2 0R115
4 7 0
5A
C102
Q102Q101
Brightness
Control4.0V DAY (18mA/LED)
2.7V NIGHT (6mA/LED)
6B5956B595
/SR
CLR
/SR
CLR
SR
CK
SO
UT
SR
CK
SO
UT
. 047
RC
K
SIN
GND
VCC
/Q2
/Q3
/Q5
/Q4
/Q1
/Q0
/Q6
/Q7
GND
GND
RC
K
SIN
GND
VCC
/Q4
/Q3
/Q0
/Q7
/Q6
/Q2
/Q5
/Q1
GND
GND
C101
12
13
/G
5 4 17
16
18
10
11
19
U102
12
13
/G
16 6 5 15
18
10
11
19
U101
9 8 3
62
7 15
14
9 8 3
14
2
7 4 17
LED
D101 D102 D103 D104 D105 D106 D107 D108 D109 D110 D111 D112 D113 D114
DA
TA
CLO
CK
Ant. 1 Ant. 2 1 .0 1 .2 1 .3 1 .5 1 .7 2 .0 2 .5 3 .0 4 .0 5 .0 LP HP
R1031 2 0
R1041 2 0
R1051 2 0
R1061 2 0
R1071 2 0
R1081 2 0
R1091 2 0
R1101 2 0
R1111 2 0
R1121 2 0
R1011 2 0
R1021 2 0
R1131 2 0
R1141 2 0
/NIGHT
1 0 1 1 1 21 2 3 4 5 6 7 8 9
J 1 0 1RF Board
GREEN YELLOW REDGREEN YELLOW GREEN YELLOW
= On bottom of PC board.
D101-D114
ANODE
CATHODE
LOAD
KAT100 Front Panel Board
Appendix A
B 1 / 4 / 0 3
24
W. Burdick
E. Swartz
ElecraftRev. Sht.DateBy
1 of 1
0.1
C15
= On bottom of PC board.
12
34
56
78
9
J1
10
1 2
3 4
5 6
7 8
9
J2
To PC
To CTRL Board
OUT
GND
IN
U2
78L05
5V
0.1
C12
T2
OU
T
R2
OU
T
R1
OU
T
T1
OU
T
T3
OU
T
R3
OU
T
R2
IN
T2
IN
T1
IN
R1
IN
R3
IN
T3
IN
GN
D
VCC
VD
D
VSS
16
12
14
15
13
11
10
23
9
18 5 47 6
U1
L4
L3
L2
L1
C1
C6
ALC
RF
AUX
ALC
8R
AUX
RF
C5
C3
C4
15µH
.001
C7 C13 C2
.01 .01 .001
MAX1406
12V
R1
3.9K
8R
10
1 2
3 4
5 6
7 8
9
J1To CTRL-P4
10
1 2
3 4
5 6
7 8
9
J2To KIO2-J2
10
1 2
3 4
5 6
7 8
9
P1To ATU-J8
ALL PINS OF P1, J1, AND J2 ARE CONNECTED IN PARALLEL
EXCEPT FOR PIN 8, WHICH IS CONNECTED AS SHOWN.
L1
C2C1 15µH0.1 .01
C3-C6: .01 µF
12V
X1
G
D
S
Q1
D4
D2
D3
C10
C8
L5
J310
-6 TO -12 V
FT23-43
120
16.289 MHz
/K2 RX
1N414810 µF
1N4148
1N4148
+
C14
56
KIO2 Aux I/O Adapter
AUX2 BOARD
L2-L4: 100 µH
/K2 TX
C9
.01
TXD
RXD
GNDOUT IN
GS
D
12V
12V
D1
1N4148
R2
47
C11
.01
Q1
U2
J1, BACK VIEW
1 2 3 4 5
6 7 8 9
6-13-01E
A C
D1-D4
49
50
16
32.768 kHz
3.9K
10K10K
RP1
R9
R10
X1
3 4
3.9KRP1
6 5
W. Burdick
E. Swartz
ElecraftRev. Sht.DateBy
1 of 1
= On bottom of PC board.
GNDOUT IN
MCLR
OSC1
OSC2
RA
2
RA
3
RA
4
VSS
RB0
RB1
RB2
RB3
RA
1
RA
0
VD
D
RB7
RB6
RB5
RB4
10
11
12
13
14
15
16
17
18
1 2 3 4 5 6 7 8 9
U2
Z1
DA
TA
/XT
GN
D
CLK
I/O
VD
D
XT
CE
1 2 3 45678
U3
6V
W1
G
DS
Q1G
DS
Q3G
DS
Q2
78L06
10µF
C10
OUT
GND
IN
U4
+
NJU6355ED
6V Reg.
R15
R16
0.22
C17
12A
470
C9
P2
12
3
456
321
S1
12
34
5
P1
C1 C2
.068 .068
C4 .01
R13
C3 .01
L1
L2
+
-BT1
D2D1
R14
R17
.01
C11
LPF1
LPF2
To Ctrl Board, J2To Ctrl Board, J1
must be removed when the KAF2 is installed.
3.9K
RP11 2
3.9K
RP1
78
C13
C12
C14
C15
12V
82 mH
82 mH
LPF1
LPF2
KAF2 Audio Filter/RTC
A
R11
R12
220
220910
5
6
7+
-
U1B 10
9
8+
-
U1C
R4
R5
R6
R8
R3R7
R1 R2
C5
C6 C8
C7
C18
6V
Filter Bypass
6V
Note 2
1. R18 and R19 on the Control board (which may be jumpers)
NOTES:
0.22
0.22
470
47K
470
5K
Low-Pass Filter
OFF
AF1
AF2
5K
470
0.22
U1: LM837N
.01
100K 510K
180K3
2
1+
-
4
11
U1A
12
13
14+
-
U1D
6V
12A
.022, 5%
.022, 5%
.01, 5%
.01, 5%
J309
1N5711 1N5711
4 MHz
220
2.7K
220
5.5V
3V
78L06
GS
D
J309
A C
1N5711
5% 5%
5%
5%
220
AF1 AF2SET
SET
AUXBUS
Band-Pass Filter
16C621A
W2
Install W2 to select DD-MM-YY date format.
2. Install W1 to skip the first-stage band-pass filter output (AF1).
OUT IN
C16 470
Controller
C19
33 pF
Real-Time Clock
8-16-01
20
K60XV Schematic
W. BurdickE. Swartz
Elecraft
1 of 1
Rev. Sht. DateBy
P 1
12
34
56
78
K1A
2 43
2.2
C5
C1 C2C3 C4
4 7 4 7
MC
LR
OS
C1
OS
C2
RA
2
RA
3
RA
4
VS
S
RB
0
RB
1
RB
2
RB
3
RA
1
RA
0
VDD
RB
7
RB
6
RB
5
RB
41
0
11
12
13
14
15
16
17
18
1 2 3 4 5 6 7 8 9
U1
Z1
R1
.001
C124 MHz 1 0 0
16C621A
K1B
97 8
P 2
1 2 3
4 .7C6
1
10
K2
K1
6V
K60XV 60m/XVTR IO
To XVTR I/O
K2A
2
4
3
.01C11
C9K2B 9
7
8
D2 D1
C8 C7
1 2 3 4
J 1
R7
BPF
TX IN
6V
.01C13
8 - 5 0 8 - 5 0
To 40/60m BPF
5 0 8 2 - 3 0 8 1 5 0 8 2 - 3 0 8 1
.01 .01
XVTR RF
OUT IN
4 7 0
MCU
.01
/ L P
/ L P
AUXBUS
3
21+
-
8
4
U2A
5
67+
-
U2B
D31N5711
R3470K
R5
1 M
R2
1 M
.001
C10
D41N5711
R6
91K
6LPQ2
R4
100K
PN2222A
Q1R9
2N390610K
6V
6T
Q3
2N7000
6T
TX RF
RFC1
15µH
TX RF
R8
4 7 0
8R
RFC2
15µH
XVTR T-R
XVTR ALC
3.6 VDC = 1.0 mW
60 m
LMC662
6LP
VRFDET
( J 1 5 )
Pins 5 and 6 of the relays are not connected internally.
K1 and K2 are DPDT latching relays shown in RESET position.
.01C14
1 2 3 4 5
J 2
.01C16
XVTR Control
PIN 6 of J13 on K2 RF board is normally 8T (8V TX) and
must be reconfigured for use as VRFDET (see text).
( J 1 3 )
*
*
R1010K.01
C15
1 GROUND
3 XVTR SELECT 04 XVTR SELECT 15 XVTR SELECT 2
2 XVTR KEYLINE
Not required with Elecraft XV Series Transverters.
Binary encoding of ADR parameter in TRN menu entries (See text)
except resistors, diodes, J1, and J2.Note: All components are located on the bottom of PC board
J2 PIN FUNCTION
* *
* *
B 3 / 8 / 0 4
K 6 0 X V M A N U A L E R R A T AR e v . A - 3 , J u n e 8 , 2 0 0 4
PLEASE MAKE THE FOLLOWING CHANGES TO THE MANUAL BEFOREPROCEDING TO ENSURE THAT THE K60XV FUNCTIONS CORRECTLY
Page 13: Delete the third assembly step from the bottom, which begins “Switch to 40 meters….”
Page 16: At the end of the first paragraph, add the sentence: “Leave D19 set for PA60=40 , even whenusing KPA100 kit revision C.” (See detailed information below.)
IMPORTANT OPERATING NOTES:
1. Using the KPA100 on 60 meters: Recent KPA100 kit modifications (revision C) allow high-poweroperation on 60 meters. However, these changes do not include a revised 80-meter low-pass filter. For 60meters, you’ll still use the KPA100’s 30/40-meter low-pass filter. For this reason, you must leave theK2’s D19 menu parameter set for PA60=40 (see K60XV manual).
2. Using TUNE mode with the K60XV and KAT2 installed: If the KAT2 is in either of its autotunemodes (AUTO or ALT), and you’re on a transverter band configured for LP mode (Low Power, 0 dBm),holding TUNE drops power to 0.2 milliwatts maximum. You can override this behavior by holdingDISPLAY along with TUNE, or by selecting any KAT2 mode other than AUTO or ALT in the menu.
3. KAT2 modification for use with K60XV LP mode: In some cases the LM358 op-amp on the KAT2can load down the K60XV's low-power RF detector (at the emitter of Q2), preventing the K60XV fromdeveloping a full 0 dBm (1 milliwatt) signal at the transverter OUT jack. To correct this, change R6 onthe KAT2 from 47 ohms to 470 ohms. This resistor is supplied with the K60XV kit. R6 is on the bottomof the KAT2 control board, and can be changed without removing the KAT2 module.