2005 k2 schematics

7/26/2019 2005 K2 Schematics

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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 43. 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

7/26/2019 2005 K2 Schematics


7/26/2019 2005 K2 Schematics


POWERAMP(15W)

BAND-PASS

FILTERST-R

CRYFILT

Ap

W. B

ATTEN.AND

PREAMP

RCVMIXER

POST-MIXERAMP

BUFFER

DRIVER

XMITMIXER

T-RNOISE

BLANKER

VCO

T-R

T-R

Common Transmit ReceiveKEY

PLLSYNTH.

MCU ANDSUPPORTCIRCUITS

DISPLAYAND CONTROLS

4.915MHz

6 - 24MHz

Shaft Encoder

7/26/2019 2005 K2 Schematics


portion of the indicated capacitance range is actually used to cover

each 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

30m K3, K4

15m K5, K6

12m K6, K7

160m K2

20m K4

17m K5

10m K7

Integrat

11915 (subtract)

14915 (subtract)

18915 (subtract)22915 (subtract)

Speci

Total Cap., pF*

6715 (subtract)8415 (subtract)

Fixed Cap., pF at band edge**

K13, K14, K15

K13, K14, K15

Tran

Relay Table

16085 (add)

VCO Freq.

23085 (add)

19975 (add)

SET Relays

VCO Table

K14, K15

K13, K15

K13, K15MPS5179

160m-K1

525-629

325-429

102-131

ZVN4424

PN2222A2N7000

82-111

2N3906

D

55-84

35-64

55-84

35-64

Band

Band

BPF LPF VCO

K11

K11

K13

K15

K12

K10

K10

40m

K8

K9K9

SG

D E BC

-

1Nxxxx

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

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 K14

K13, K14

NOTE: All relays are single-coil latching type and are

K140m*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)

C71+C73 (129)

C71+C73 (129)

* This includes capacitance of varactor diodes D23-D26 on all bands, D21-D22

C71 (120)

163-209

154-203

*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).

7/26/2019 2005 K2 Schematics


(S0 through S23 connected to DS1; only S0 and S23 shown)

VIM-838-DP 8-DIGIT LCD

(based on LED Vf=1.9V)

To RF Board, P1

Shaft Encoder

6B595

LCD Driver

Backlight

6B595

LED Array

1 B , C ,DP

1 F ,E ,A N

2 B , C ,DP

2 F ,E ,A N

3 B , C ,DP

3 F ,E ,A N

4 B , C ,DP

4 F ,E ,A N

5 B , C ,DP

5 F ,E ,A N

6 B , C ,DP

6 F ,E ,A N

7 B , C ,DP

7 F ,E ,A N

8 B , C ,DP

8 F ,E ,A N

PCF8566

C L K I N H

5K (audio taper)

/ M I C R D

/MIC RD

68.1K, 1%

PN2222A

/SR RD

1 A , G ,D

2 A , G ,D

3 A , G ,D

4 A , G ,D

5 A , G ,D

6 A , G ,D

7 A , G ,D

8 A , G ,D

S R W R T

/ S R C L R

SR DIN

/ B A N K 1

S R D I N

S R W R T

/ S R R D

/ S R C L R

2N3906

/NIGHT

V POTS

A U

X B U S ( N C )

RECALL

/ S Y N C

S R

C K

S H / L D

SR CK

E N C A

E N C

B

S R

C K

E N C

A

E N C

B

BAND+

BAND-

STORE

C OM1

C OM2

C OM 3

C OM 3

C OM2

C OM1

V L C D

.047

ICLKIDAT

S R C K

S O U T

I C L K

I D A T

LEDs

S R C K

S O U T

FUNC

MENU

EDIT

DS1

S D A

S C L

C L K

V D D

O S C

S A 0

V S S

B P 0

B P 2

B P 1

B P 3

S 1 0

S 1 1

S 1 2

S 1 3

S 1 4

S 1 5

S 1 6

S 1 7

S 1 8

S 1 9

S 2 0

S 2 1

S 2 2

S 2 3

DS2

C L K

S E R

/ Q H

G N D

V C C

.01

.01

120

RP2 120

R C K

S I N

G N D

V C C

/ Q 0

/ Q 1

/ Q 2

/ Q 3

/ Q 4

/ Q 5

/ Q 7

/ Q 6

G N D

G N D

ccw

S R

D O U T

S23

S 1 0

S 1 1

S 1 2

S 1 3

S 1 4

S 1 5

S 1 6

S 1 7

S 1 8

S 1 9

S 2 0

S 2 1

S 2 2

S 2 3

.01

Mic

PTT

GND

.01 .01 .01

R C K

S I N

G N D

V C C

/ Q 0

/ Q 1

/ Q 2

/ Q 3

/ Q 4

/ Q 5

/ Q 7

/ Q 6

G N D

G N D

.01

GND

RP3

RP3

R13

RP3

RP3

10K

10K

10K

R11

220

R9

470

S2

S3

C2

33

1015202530

A 0

A1

A2

10 15

S 0

S 1

S 2

20

S 3

21 S 4

S 5

S 6

S 7

25 S 8

S 9

303540

U1

20

10

5A

R3

R10

V-

V +

Z1

S6

S4

S1

S5

1 5

1 0

1 1

1 2

1 3

1 4

Q H

1 6

5A

C9

C1

5A

5 A

11 12 13 14 15 16 17 18 19

R12

10

1 2

1 3

/ G

1

4

1

5

1

6

1

7

1

8

1 0

1 1

1 9

U3

cw

S0

S 4

S 5

S 6

S 7

S 8

S 9

C8

J2

AF

DN

UP

5V

C4 C5 C7

5A 10 11 12 13 14 15 16 17 18

J1

5 A

D2 D3

5A

1 2

1 3

/ G

1

4

1

5

1

6

1

7

1

8

1 0

1 1

1 9

U4

C6

Q3

Q1 Q2

R

R

S 3

S 2

S 1

S 0

D2 D5

D6 D1

D7 D0

D 0 D 1 D 2 D 3 D4 D5 D 6 D 7

123456789

1 2 3 4 5 6

7

1 5

4 3

B

2

A

1

1 2

A B C D

3

E

4

F

5

G

6

H

7 9 8

1

2 3 4 5 6 7 8 9

9 8 3

4

2

5 6 7

1

2

3

4

5

6

7

8

1 2 3 4 5 6 7 8 9

9 8 3

4

2

5 6 7

6

5

4

3

2

1

8 7

R16 R15

15K 10K

.047

C3

Bargraph

Brightness

Control

/ S P D R D

V POTS

S R

D O U T

MIC AF

/DOT-PTT

4.0V DAY (18mA/LED)

2.7V NIGHT (6mA/LED)

Mic Config.

AF Gain

/ B A N K 2

5A

P1

1

2

3

4

5

6

7

8

2V

/ENC RD

These components are supplied with SSB adapter.

7/26/2019 2005 K2 Schematics


Note: Current sense resistor

8V Low-Dropout Reg.

Voltmeter Input

Quad, 8-bit

To RF Board, J7 To RF Board

To RF Board, J6

Current Sense

Voltage Sense

8V Switching

100kHz-40MHz

V B I A S - X F I L

(0.1V res.)LMC6482AIN

0.00-5.10A

Freq. Ctr

LM2930T-8

/SLOW AGC

1.78k, 1%

5.1K

4.000MHz

5.068MHz

/AGC OFF

806K, 1%

196K, 1%

SR DOUT

/DAC2CS

5V Reg.

MPS5179 MPS5179

5V FCTR

V SENSE

I SENSE

PN2222A

0-25.5V

V RFDET

S R

D O U T

/ D A C 2 C S

SR WRT

MAX534

SR DIN

V POTS

/PLLCS

/SR RD

/ S R R D

S R D I N

1N4148

2N3906

2N3906

1N4148

12V IN

2N700

S R W R T

V P O T S

1 2 V I N

A U X B U S

A F O U T

/ P L L C S

A F O U T

LMC660

V SMTR

V SMTR

/LDAC

SR CK

ENC B

/MUTE

/DASH

NE602

LM833

/DAC1CS

100µF

78M05

ENC A

COUNT

S R

C K

E N C

B

V B F O

E N C

A

V A L C

V ALC

V PWR

V PWR

Input

OUTB

OUTA

/CLR

DOUT

8-50

ICLK

IDAT

/DOT-PTT

.001

3.9K

3.9K

22µF

82K 82K

I C L K

I D A T

VOL1

VOL2

.001

U10A

47K

.01

.001

REF

UPO

PDE

C21

C22

P D 2

P D 112V

U2B

330

C10

.01

.01

3.3M

33K

U2A

.047

SCK

RP1

RP1

RP7

33K

C15

C13

12V

.047

C19

OUT

GND

OUT

GND

.01

C37C38

RP5 RP5

RP4RP4

C39

.01

.01

680

470

.047

C16

U3B

R10

U3A

100

.01

C17

.047

C14

5.1K

AGC

12V

2.2µF

C11

RP3

RP6

5.1K

C31

C34

5A

5A

5A

U8

X2

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

P3

C7

C9

C8

U1

V-

V+

nc

X1

39

8A

C2

R2

D1

R5

8A

C6

Q18T

Q2

8R

Q3

Q4

D2

P1

IN

U5

IN

U4

5A

C3

Q9 Q10

470

P6

R9

R8

R7

1%

P5

Q11

8A

8 R

8 T

8A5A

5A 8A

RP6

RP6

8A

C1

1

2

3

4

5

6

7

8

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

86

5

7

+

- 3

2

1+

-

8

4

1

1 2 3 4 5 6

2

1

+ +

21

1

2

5

67+

-

2

3

1-

+

8

44 3 2

5 6 7 8

3

21

+

-

2 1

12

RX

TX

R.F. GAIN

I.F. OUT

8R

is R115 on the RF board.

RXD

V AGC

1 0

1 2

3 4

5 6

7 8

9

P4

Aux I/O

12V

8TRXD.0027

C12

R6

100

AUXBUS

AUXBUS

/AGC OFF

270KR21

82KRP2

4 3

ALC

E X T A L C

V RFDET

EXT ALC

PN2222A

Q8

8A C18 .01

C20

.001

8R

C5 .01

3 4

4

3

5

6

/EECS

V SENSE

I SENSE

+-

10

9

4 3

5 6

Q12

PN2222A

8R 8T

TXD

RP7

33K

3

4

10K

R3

8R

5.1K

RP6

12 /SLOW AGC

0.47µF

C4

+

5A

5A

RP7

33K

5 6

2

T O N E V O L

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

18C452

MCU

5.6K

R4

/H

/CS

/WP

VSS

SDO

1

2

3

4

U7

25LC32

EEPRO

0.1

C42

TXD

.001

C43

P7

1 2 3

INTEXT

Voltmeter Source

5.1K

RP6

8

7

R1

50K

AGC THR.

ccw

cw

820R12

V O L 3

= 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 Used

C44

82KR22

22µF

C45

+

("D3" on PCB).01C46

*

*

Part of CW key shaping*mod; solder on back (see text)

7/26/2019 2005 K2 Schematics


F r o n t P a n e l B o a r d

Relays are shown in RE

(Vout = 0 to 4.096V)

VFO Range Se

Key/Keyer/Paddle

PLL SynthesizerPLL Reference

C o n t r o l

1µF

V BIAS-XFIL

12-Bit DAC

12.096MHz

B o a r d

R . F . G A I N

R . F . G A I N

MC145170

I . F . O U T

/DAC2CS

LTC1451

1SV149

Speaker

V R F D E T

S R

D O U T

S R

D O U T

Phones

/PLLCS

OSCOUT

REFOUT

LMC662

LMC662

LD /CS

AF OUT

1N4148

/ S R R D

SR DIN

S R W R T

V P O T S

1 2 V I N

A U X B U S

A F O U T

A F O U T

S R D I N

S R W R T

/ S R R D

A U X B U S

V P O T S

M I C A F

100K

MV209

OSCIN

PDOUT

78L05

18µH

4.7µH

RFC14

2.2µF 2.2µF

220µF

MV209

1SV149

100

S R

C K

E N C

B

V B F O

E N C A

V A L C

S R

C K

E N C A

E N C

B

V

A G C

RFC16

47µH

2.2K

10µF

10K

/ENB

DOUT

PH R

PH V

DOUT

VOUT

12µH

J310

2.7K

10K

.001 .001

2.7K

C105

C106

C103

3.3M

10K

I C L K

I D A T

VOL1

VOL2

I C L K

V O L 1

V O L 2

/ D O T - P T T

I D A T

.01

RFC10

2.7K

C100

.001

C175

L31

1.8K

27K

10K

.01

C92

C93

C73

C71 C72

C75

C74

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

R31

0.1

C86

CLK

DIN

GND

REF

VCC

.022

OUT

C87RP2

D22

R32

270

470

K15

K14

K13

D16

82 82

Q19

D18

D21

D25

D23

L30

D26

D24R22

D17

C

15K

R33

RP2

P D 2

P D 112V

12V

C94

.047

C95

120

R30

1mH

C96

TP3

R19

.01

C2 C1

47

J2

U4

U5

U8

X2

FR

10FV

11LD

12

13

14

15

16

IN

82

20

nc

nc

J1

P5

R2 R1

220 220

X1

8B

8B

J6

8 R 8

T8A5A

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

5 A

10 11 12 13 14 15 16 17 18 19 20

P1

10

11

12

13

14

J8

5B

8B

8B 5B

8 R

8A

3

21+

-

8

4

1

2

3

4

5

6

7

8 9

5

67

+

-

G

D

S

1

2

3

4 5

6

7

8

+

24

3

97

8

24

3

97

8

24

3

97

8

2

1

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

E X T A L C

1 2 4 3

4, 5

C90

.047

/ D O T - P T T

/ D A S H

8 R

8 T

8T

2, 3 1

position. See relay ta

MV209

D19D20

10K

R29

V O L 3

V O L 3

(NOTE 1)

Oscillator12.090-12.100 MHz

(NOTE 2)

(NOTE 2)

C89

.001

RFC15

.001

C91

5B

100 µH

(NOTE 3)

NOTE 1: X2 is not used.

10K

12KRB

Rt

33KRA

88B

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, 710KRE

4V

(replaces RP3 on PC board)

4V

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.

7/26/2019 2005 K2 Schematics


S S B A d a p t e r

BFO Buffe

Post-Mixer Amp.

RP4, RP5: 100K

V BIAS-XFIL

Attenuator

Xmit Mixer

Rcv. Mixer

RF Preamp(Sh. 3)

IF Amp

2N5109

2N5109

Buffer

LT1252

1N4007

1N4007

RX VFO

TX VFO

+14dB

100µH

2.7K

2.7K

NE602

100µH

100µH

RFC11

RFC12

RFC13

V AGC

TUF-1

-10dB

V ALC

680

1.8K

C155

C161

C183

C185

C162

C160

C159

C141

C146

C184

C150

C167

2.7K

5 . 6 K

C151

.001

R 1 1 1

C182

18

C166

R101

2.7K

C142

C143

.01

C145

C154

C156

C153

C158

.01

C53

C54

C52

C55

0.1

AGC

.01

.01

.01 .01

220

R83

R80

R81

R85

150.047

R82

.01

R76

R77

R75

.01

.01

.01

.01

R95

R96

82

R94

R93

330

R92

U10

BPF

12V

100

68

100

.01

K16

K17

0.1

Q21

Q22

R97

180

R84

X10 X11

D30 D31 D32 D33

D34D29

RP4 RP4 RP4 RP5RP5 RP5

.047

10K

J10

J11

.01

R73470R72

.01

R74

12V

100

.047R91

820

R78

.01

270

R99

270

R98

R8

U9

R6

R7

.01

680

10

4.7Ω

18

820

33

V-

V+

R5

33

X7 X8 X9W2 W3

J9

8R

D6

D7

10 11 12

T6

47

8T

68

Z6

22

1234

5 86 7

1

2

3

4

5

76

8

3

26 +

-

7

4

2

4

3

9

7

8

2

4

3

9

7

8

1 2 32

1 2 3 4 5 6 7 8 9

1

3

2

4

1 2

3

4

C164

.01

+7dBm

XFIL OutXFIL In

SSB Control

8 R

A U X B U S

8 T

/ D O T - P T T

M I C

A F

V R F D E T

V XFIL2

4

1

2

3

T7

C157

.047

Q20

8T

12V

2N7000

C144

100pF

508

EXT ALC

C163

.01

1.8K

R79

8R

C165

.01

8A

2

1

4

3

6

5

1

2

3

4

5

6

13

D29-D34: 1SV149

3.9K

R114

C186

.01

C17

100

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).

7/26/2019 2005 K2 Schematics


Band-Pass Filters

I n t e r f a c e

Low-Pass Filters

X v e r t e r

BPF Relays

PRE-DRIVER

VCO Relays

Pre/Attn.

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

50pF 50pF

5-30pF 5-30pF

5-30pF 5-30pF

AUXBUS

4.0MHz

Relays

Relays

Bypass

Bypass

100µH

100µH

47µH

78L06

RFC1

RFC2

1K

RFC31K

MCLR

OSC1

OSC2

C108

C107

C110

C109

C114

C113

C 1 9 5

C 2 2 3

C 2 1 6

C207C204

C139C140

.001

.001

.001

.001

LPF

33µH

XVTR

.01

BPF

C30 C36

C33

K1A

K5A K5B

K1B

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

.01

.01

.01

.01

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

K2A K2B

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

C 2 7

C 9

C 2 6

K9

K13

K14

K15

K16

K17

C 8 0

C 8 1

R39

R64

C 3 8

C 4 9

C 3 7

C 7 9

C57

C82

100

C131200

C14

0.1

C39

C4 C8

C6 C7

L4

L8 L9

D1

C5

D2

D4

C 1 7

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

L5

W6

J13

W1

2

4

3

2

4

3

9

7

8

9

7

8

2

4

3

9

7

8

2

4

3

9

7

8

2

4

3

9

7

8

2

4

3

9

7

8

2

4

3

9

7

8

1

5

10

10

10

10

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8

4.7µH 4.7µH

1 6 0 m /

R X A n t.

12V6V

160RY

RXRY

RXRY RY COM

RY COM

D3

ZVN4424A

100K

R37

8R

8T

8R

A U X B U S6V

6V

4.7µH 4.7µH

4.7µH 4.7µH

1µH1µH

1µH 1µH

/CLASS AB

15µH

RFC7

C104

68

1N4007

D5

8R

2.7K

R34

I/O Controller

D

S

G

However, these pins may be connected to other relay pins

or 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

20/30m

10/12m

15/17m

C28

12

C29

12

or 16F872

ALL RELAY BYPASS CAPACITORS ARE .001µF

20m/

160m

(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.

7/26/2019 2005 K2 Schematics


Power Amplifier (PA)

12:8, FT37-43

9:3, FT37-43

PRE-DRIVER

Pre-Driver

2SC2166

(Sh. 3)

2SC1969

2SC1969

PA Bias

PN2222A

PN2222A

2N5109

Driver

100µF

0.68µH

4.7Ω

470

C117

C115

C133

1.5Ω

C119 C126

47µF

RFC5

10µH

C127

C128

C129

C137

C122

RFC4

10µH

C124

RFC6C120

C130C121

C138

4.7K

C116

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

680

680

.01

56

0.1

R49

120

.010.1

.01

Q11

Q13

R59 R61

R62

.047

2.7K

120

33

47

Q7

Q8

Q5

Q6

Z1

Z2

47

33

33

T1

T2

8T

3

41

2

3

41

2

+

+

C125

22µF

RFC8

10µH

RFC9

10µH

C135

.01

Q10

2N7000

V BIAS-XFIL

8T

C118

.01

2.7K

R44

C131

0.1

8T

G

S

D

R48

120

+

R63

220

/CLASS AB

C A

D B

1/2 W

100R60

7/26/2019 2005 K2 Schematics


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 transmittersoperating 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 for

two additional transverter in/out jacks (RCA connectors). Your kit may not have this new rear panel because it was being phased into production at the time the manual was written. You can obtain the

new rear panel later if you plan to purchase the K60XV option (60 meters and low-level transverter I/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).

7/26/2019 2005 K2 Schematics


3

2

5

6

2SC2879

R35

R34

Q2

Q1

10

10

K1

K2

5

4

2

3

1

T1

4

5

2

3

1

T2

C83

C81

C80

C59

R20

R19

R39

D12

D11

D14

D13

C79

C86

N:111

RFC5

RFC4

RFC3

L16

C76

Q6

R14

R11

R21 R23

R22

300

L18

C82

.047

470

12PA

.01100µH

RFC1C75

R13

100

0.1100µH

12PA

.039

1N4007 1N4007

C71

.0018

200V

C72

.01

5R

100µH

ZVN4424

510KQ7

R12

C31

.033

200V

C73

.01

ZVN4424

180K

5T

90-150V

100µH 5µH

1N40071N5404

(not used)

10 0 ohms

0 uH

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

1000

s.m.

4700

4700

1.6

2W

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

.047

C48

.047

C85

.047

Lo

Current Sense

LMC6482

3.09k, 1%

I SENSE

2N3904

U7A

100

R32

R30

1%

Q5

2

31

-

+

8

4

2

1

J3

12V, 20A

+-

R7 .005 ohms

PA

5

67

+

-

U7B

LMC6482

R6

R5

Q3

5B

Q4

MJE182

MJE182

15K

1K

Bias Set

D10

1N5404

0.6-0.9 V

D9

SB530

(Ext. Fuse) 12PA

("AUX 12V")

2

1J5

AF In

2

T SENSE

2W

2W (jumper)

12K2

GND

2

1

J1

K2 RF

RF IN

GND

2

1

J4

K2 12V

+-

("AUX RF")

AF

GND

1W

200V

3W

25V

3W

C33

0.1

C30

0.1C34

0.1

(0-5 V = approx. 0-32 A)

(2 beads)

C77

.015

200V

RFC11

100µH

*

T44-2

L15

5µH T44-2

T-R Switch

High-pass Filter

= on bottom of PC board

TP2

Not on the PC board.

(jumper)

64

7/26/2019 2005 K2 Schematics


PIC16C72

AUXBUS

78L05

MCLR

OSC1

OSC2

C23

C25

.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 C

.

2

C41

100

R4

100KX1

18.432MHz

4

2

3

1 T3

7T bifilar

FT37-61

D6

D5

D8

D7

R10

47C40

0.1

C39

.01

C38

.01

12CTRL

12CTRL

D4

D3C37

.01

30V

D2

C36

.015

200V

8

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

1

2

3

4

5

6

7

8

9

J8

T 2

O U T

R 2

O U T

R 1

O U T

T 1

O U T

T 3 O U T

R 3 O U T

R 2 I N

T 2 I N

T 1 I N

R 1 I N

R 3 I N

T 3 I N

GN D

V C C

V D D

V S S

1 6

1 2

1 4

1 5

1 3

1 1

1 0

2 3

9

1 8 5 4 7 6 U4

RFC8

RFC7

RFC6

RFC9

C84

C9

VRFDET

AUXBUS

8R

A U X B U S

V R F D E T

C8 C7

C32

15µH

.001

C97

.01

MAX1406

12CTRL

TXD

RXD

1 2 C T R L

12CTRL

5V

-5 TO -25V

RS232 Interface

/ K 2

T X

/ K 2 R X

(BACK VIEW)

1 2 3 4 5

6 7 8 9

10

1

2

3

4

5

6

7

8

9

P1

To Ctrl Board

Q9

IRF830 or IRL620

K2

C22

.01

J7

D1-D8 =

NOTES

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

IN3

14

13

12

11

10

18

17

16

15

3

5

9

8

7

6

1

2

4

U2

TD62083

or ULN2803

12CTRL

5B

nc

8 T

( N C )

M

FAN

FAN+ FAN-

J8

RP156

3.9K

1/2W

LPF IN

SCALE

30pF

C27

K1

C29

.01

C28

.01

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

65

7/26/2019 2005 K2 Schematics


K2/100 MANUAL (Appendix G) ERRATA

R 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 higher

mismatch 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 component

values).

Errata Items1. Page 7, parts list: Change R4 from 100 k to 39 k. (Your kit may include an

unneeded 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 large black RF choked marked “101”). Solder the resistor to RFC3’s leads.

4.

Page 24, left column, first paragraph: The second sentence in this paragraph should be replaced with: "Each toroid is wound on a specific type of core. One example is

type T44-2."

5. Page 24, right column, first assembly step: The reference to a T50-2 core in this

paragraph 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 to

ground (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 CW

mode. 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 the

left 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.

7/26/2019 2005 K2 Schematics


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

1 0 1 1 1 2

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

K S S B dapt er

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.

P N2 22 2A 7 8L 06

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

1

6

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 -2 0- 04

7/26/2019 2005 K2 Schematics


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, 2004now 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 areinterested, 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.

7/26/2019 2005 K2 Schematics


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 56 472.4 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 highfrequencies 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.

7/26/2019 2005 K2 Schematics


11

K160RX Schematic

W. Burdick

E. Swartz

Elecraft

Rev. Sht.Date

C1 C2 C3

1500 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

J 1

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

R

Y C O M M O N

C6

.001

R

X R Y

1

6 0 R Y

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

7/26/2019 2005 K2 Schematics


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 overall

signal strength, keeping the signal at D2 relatively constant. Negative-going pulses that are above the threshold

established by D3 and R3 turn Q2 on, triggering the one-shot (Q3/Q4). Q6 can be used to switch in a larger-value

capacitor, increasing the blanking time. The pulse output of the one-shot (GATE) saturates Q5, attenuating the signal at

the output of the band-pass filter. The band-pass filter creates a small delay between input and output, so that the GATE

signal arrives just ahead of the noise pulses. The controller, U3, decodes auxBus commands from the main processor. It

then controls power to the blanker (via Q7), pulse width (via Q6), and blanking threshold (via R3).


KNB2 Noise Blanker

Band-Pass Filter

To RF Board, J12

0V = NARROW

PULSE 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

R F O U T

2N3906

2N3906

2N3906

2N3906

2N7000

12C509A

40 µH

2N7000

78L06

Rev. Sht.

1N34A

1N34A

78L06

10 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

1800

0. 1

OUT

GP5GP4

VDD

GP3 GP2

GP1GP0

VSS

RP1

RP1

RP2

RP2

RP1

C15

12V

.001

C13

.0 1

C14

6NB

6NB

6NB

6NB

RP2

C16

RP2

C12

ALC

C1122 0

22 0

R P 1

GNDOUT

22 0

.0 1

1500

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 46

5

4

3

2

1

5 67

8

7

8

SG D E B

C

MC1350, 12C509A

1

2

3

4 5

6

7

8

Controller

1M

R10

30 0

R9

12 0

R8

82 0

C3

.0 1

C17

(-6 dB)

D 8 - 1 9 - 0 2

7/26/2019 2005 K2 Schematics


7

(+)(-)

3" Red7.5" Red

7"Black

12"Red

Detail B

Figure 3

7/26/2019 2005 K2 Schematics


23

Circuit Details, KAT2 L-C Board

The L-C board provides eight series inductors and eight parallel capacitors, configured as an L-network. The

capacitance can be placed at the transmitter or antenna end of the network via a relay on the Control board (see next

page). Each inductor and capacitor has its own DPDT relay, with the individual sections of each relay placed in parallel

for reliability. The relays are selected under control of the ATU's microcontroller. Latching relays are used so that they

will not consume any power except when the operator is actually tuning. The relays are switched one at a time to keep

switching 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, and

redundant pins are used for RF signals. Bypass capacitors are used on relay control lines to prevent RF signals from

reaching 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. Burdick

E. 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

C 7

_ 8

C 3

_ 4

C 5

_ 6

C 1

_ 2

K12 K15 K16K13 K14 K10 K11

K10 K11 K12 K13 K14 K15 K16

150 300 620

C20

C23

C22

C21

C24

C25

C26

C27

C31

C32

C33

C34

C35

C36

C37

C38

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 C8

10 2239 82

K1 K3 K5 K7

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

24

3

97

8

24

3

97

8

24

3

97

8

24

3

97

8

24

3

978

24

3

97

8

24

3

978

24

3

97

8

24

3

978

24

3

97

8

24

3

978

24

3

97

8

1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9

2 4

3

9 7

8

2 4

3

9 7

8

2 4

3

9 7

8

2 4

3

9 7

8

*

*

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

7/26/2019 2005 K2 Schematics


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 more

accurate than the K2's standard RF detector (D9) in the presence of non-50-ohm loads. The bridge output is buffered by

op-amp U4 and routed to the K2 control board, overriding the signal from D9. The bridge outputs are also connected to

A-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 data

for 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


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

3.3K

M C L R

O S C 1

O S C 2

REFL

.001

.001

.001

C55

C54

C50 C51

100

.001 .001

C52 C53

200

K18

FWD

0.1

OUT

C58

0.1

C59

C57

.001 .001

100KK17

K18

GND

K17

MMMMCCCCUUUU

470

R A 4

R C 0

R C 1

R A 0

R A 1

R A 2

R A 3

R A 5

R E 0

R E 1

R E 2

V D D

V S S

R C 2

R C 3

R D 0

R D 1

R D 2

R D 3

R C 4

R C 5

R D 4

R D 5

R D 6

R D 7

V S S

V D D

R B 0

R B 1

R B 2

R B 3

R B 4

R B 5

R B 6

R B 7

R C 6

R C 7

FWD

/CS

/WP

VSS

SCK

VCC

SDO

SDI

C45

C46

C47

.001

C60

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

1 0

1 0

RF

R5

1 0

1 5

2 0

2 1

2 5

3 0

3 5

4 0

U1

U2

6V

T1

E1

2

4

3

9

7

8

1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9

1

1

2 4

3

9 7

8

1 5

1

2

3

4 5

6

7

8

4

2

3

1

65

nc nc

2 of 2

KAT2 ATU Control Board

5

4

3

2

1

J3

Aux I/O

(Sheet 1)

AUXBUS

12V

3

2

1 +

-

8

4

U4A

6V

LM358

6V

G

6V

A

B

5

67+

-

U4B

NOT USED

47

R6

F 11/27/00

7/26/2019 2005 K2 Schematics


W. Burdick

E. Swartz

Elecraft

10.4 µH.64 µH 1.3 µH 2.6 µH 5.2 µH

Rev. Sht.

.08µH .16µH .32µH

Date

1200

0. 1 0. 1 0. 1 0. 1

K11 K12 K14K2 K5 K8 K9

15 0 15 0 15 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. 1

C9

0. 1

C29

KAT100 RF Board

1 of 2

L OUT

K13

14

K1 0

3

1

4

K2

3

14

K33

14

K43

14

K53

14

K63

14

K73

14

K83

14

K1 1

3

1

4

K1 2

3

1

4

K1 3

3

1

4

K1 4

3

1

4

K1 5

3

1

4

K1 6

3

1

4

6B595 6B595

/ S R C L R

/ S R C L R

S R C K

S O U T

S R C K

S O U T

0. 1

R C K

S I N

G N D

V C C

/ Q 4

/ Q 5

/ Q 6

/ Q 7

/ Q 2

/ Q 3

/ Q 1

/ Q 0

G N D

G N D

R C K

S I N

G N D

V C C

/ Q 7

/ Q 6

/ Q 0

/ Q 1

/ Q 2

/ Q 3

/ Q 4

/ Q 5

G N D

G N D

C48

1 2

1 3

/ G

6 7 4 5 1 8

1 0

1 1

1 9

U3

1 2

1 3

/ G

6 7 1 5

1 4

1 8

1 0

1 1

1 9

U2

9 8 3

1 4

2

1 5

1 6

1 7

9 8 3

1 7

2

1 6

4 5

6B595

/ S R C L R

S R C K

S O U T

R C K

S I N

G N D

V C C

/ Q 0

/ Q 4

/ Q 5

/ Q 6

/ Q 7

/ Q 2

/ Q 3

/ Q 1

G N D

G N D

1 2

1 3

/ G

1 7

6 5 7 1 8

1 0

1 1

1 9

U4

9 8 3

4

2

1 4

1 5

1 6

5V

K1 7

2

5

0. 1

C30K1 8

2

5

RYCK RYLOAD

R15

(Sheet 2)

*

*

15 0

C6A

15 0

C7D

15 0

C7C

15 0

C7A

C27

0. 1

K9

3

1

4

RFC2

47 uH

0. 1

C52

0. 1

C53

12V

0. 1

C18

0. 1

C28


= Components not supplied; for future use.

0. 1

C54

(Sheet 2) (Sheet 2)

RYDATA

Note: All relays are shown in the N.C. position.

0. 1

C55

/EOT

(Sheet 2)

/ R S C L

/ F S C L

1 2 V R Y

SRTEST

0. 1

C59

Appendix A

B 1 / 4 / 0 3

7/26/2019 2005 K2 Schematics


W. Burdick

E. Swartz

Antenna 1

Antenna 2

L OUT

Elecraft

L IN

7805

25LC320

4.0MHz

Rev. Sht.

16F877

/HOLD

Date

M C L R

O S C 1

O S C 2

10 µF

OUT

C420. 1

C43

MCU R A 4

R C 0

R C 1

R A 0

R A 1

R A 2

R A 3

R A 5

R E 0

R E 1

R E 2

V D D

V S S

R C 2

R C 3

R D 0

R D 1

R D 2

R D 3

R C 4

R C 5

R D 4

R D 5

R D 6

R D 7

V S S

V D D

R B 0

R B 1

R B 2

R B 3

R B 4

R B 5

R B 6

R B 7

R C 6

R C 7 /C S

/W P

VSS

SCK

VCC

SDO

SDI

By

J 5

J 6

U8

IN

Z1

1 0

1 5

2 0

2 1

2 5

3 0

3 5

4 0

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

10 0

.001 .001

20 0

100K

R2

D1 D2

R1

R4R3

T1

4

2

3

1

5

67+

-

U5B

3

2

1+

-

8

4

U5A

SWR Bridge

RP1

4

3

RP1

1

2

R7

1W

3.9K

3.9KR6

C35

.001

8.45K

1%

8.45K

1%

C36

.001

VRFDET

C39

5V C40

0. 1

LM358

.0 1

VREFL

VFWD

FT50-43

FWD REFL

EN

3

26

+

-

7

4

8

U6

R8

3.3K

R9

3.3K

C38

.0 1

VRFEN

EL5146C

TP4

Ground Post

12V DC

1N5817

D4

J 1

D3

P 3

1

2+

-

Aux. 12V

C44

.047

Q1

R12

10 KR11

68 0

Q22N7000

12V

5V

(Sheet 1)

1

2

3

4

5

6

7

8

9

J 3

Control

RFC1

C47

VRFDET

AUXBUS

15µH

.001

C46

.0 1

(BACK VIEW)

1 2 3 4 5

6 7 8 9

1 0

1 2

3 4

5 6

7 8

9

P 4

Aux Control

C45

.0 1

KAT100 RF Board

2 of 2

5V

R5

12 0

AUXBUS

12V

12CTRL

K1 7

3

1

4

K1 83

14

C

0. 1

C41

Aux RF In

J 2

P 6

1

2

Aux RF Out

J3

ANT1

ANT2

GND

GND

E1

GND

Ant. Switch

10 1 1 1 21 2 3 4 5 6 7 8 9

P 5

W 4

W 3

5V / S W

C T

/ C D

Front Panel

W 5

W 6

C37

.0 1

R13

8.45K

*

RP1

5 6

3.9K

*

P 2

1 2

*

1 %

ZTX789A

1/2 watt

C49

.047

C51

.0 1

C50

.0 1

VPS

V P S

/FSCL /RSCL

R16

10 K

RFIN

P 1

1 2

F P D A T A

F P C K

F P L O A D

F P L O A D

F P C K

F P D A T A

I D A T

I C L K

R Y L O A D

R Y C K

R Y D A T A

/ S W

V S W

I D A T

I C L K

*= On bottom of PC board.

= Components not supplied; for future use.

A D 1

A D 2

1 2 3 4 5 6

J 7

A D 1

C T

A D 2

/ C D

* 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

.047

C56

0. 1

C57

0. 1

C58

V R F E N

V F W D

V R E F L

W 2

W 1

R 17 1 0K

R 18 1 0K

S R T E S T

0. 1

C60

/ON

Q3

2N7000

RP1

7

8

3.9K

/ 8R

/ 8R

*

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).

7/26/2019 2005 K2 Schematics


W. Burdick

E. Swartz

Elecraft

Rev. Sht.DateBy

1 of 1

5A

(based on LED Vf=1.9V)

PN2222A

.047

R116

22 0

R115

47 0

5A

C102

Q102Q101

Brightness

Control

4.0V DAY (18mA/LED)

2.7V NIGHT (6mA/LED)

6B5956B595

/ S R C L R

/ S R C L R

S R C K

S O U T

S R C K

S O U T

.047

R C K

S I N

G N D

V C C

/ Q 2

/ Q 3

/ Q 5

/ Q 4

/ Q 1

/ Q 0

/ Q 6

/ Q 7

G N D

G N D

R C K

S I N

G N D

V C C

/ Q 4

/ Q 3

/ Q 0

/ Q 7

/ Q 6

/ Q 2

/ Q 5

/ Q 1

G N D

G N D

C101

1 2

1 3

/ G

5 4 1 7

1 6

1 8

1 0

1 1

1 9

U102

1 2

1 3

/ G

1 6

6 5 1 5

1 8

1 0

1 1

1 9

U101

9 8 3

6

2

7 1 5

1 4

9 8 3

1 4

2

7 4 1 7

LED

D101 D102 D103 D104 D105 D106 D107 D108 D109 D110 D111 D112 D113 D114

D A T A

C L O C K

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

R103

12 0

R104

12 0

R105

12 0

R106

12 0

R107

12 0

R108

12 0

R109

12 0

R110

12 0

R111

12 0

R112

12 0

R101

12 0

R102

12 0

R113

12 0

R114

12 0

/NIGHT

10 11 1 21 2 3 4 5 6 7 8 9

J 1 0 1

RF Board

GREEN YELLOW REDGREEN YELLOW GREEN YELLOW


D101-D114

ANODE

CATHODE

L O A D

KAT100 Front Panel Board

Appendix A

B 1 / 4 / 0 3

7/26/2019 2005 K2 Schematics


24

W. Burdick

E. Swartz

Elecraft

Rev. Sht.DateBy

1 of 1

0.1

C15


1

2

3

4

5

6

7

8

9

J 1

1 0

1 2

3 4

5 6

7 8

9

J 2

To PC

To CTRL Board

OUT

GND

IN

U2

78L05

5V

0.1

C12

T 2 O U T

R 2 O U T

R 1 O U T

T 1 O U T

T 3 O U T

R 3 O U T

R 2 I N

T 2 I N

T 1 I N

R 1 I N

R 3 I N

T 3 I N

G N D

V C C

V D D

V S S

1 6

1 2

1 4

1 5

1 3

1 1

1 0

2 3

9

1 8 5 4 7 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

1 0

1 2

3 4

5 6

7 8

9

J 1

To CTRL-P4

1 0

1 2

3 4

5 6

7 8

9

J 2

To KIO2-J2

1 0

1 2

3 4

5 6

7 8

9

P1

To 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

7/26/2019 2005 K2 Schematics


49

7/26/2019 2005 K2 Schematics


50

7/26/2019 2005 K2 Schematics


16

32.768 kHz

3.9K

10K10K

RP1

R9

R10

X1

3 4

3.9KRP1

6 5

W. Burdick

E. Swartz

Elecraft

Rev. Sht.DateBy1 of 1


GNDOUT IN

M C L R

O S C 1

O S C 2

R A 2

R A 3

R A 4

V S S

R B 0

R B 1

R B 2

R B 3

R A 1

R A 0

V D D

R B 7

R B 6

R B 5

R B 4

1 0

1 1

1 2

1 3

1 4

1 5

1 6

1 7

1 8

1 2 3 4 5 6 7 8 9

U2

Z1

D A T A

/ X T

G N D

C L K

I / O

V D D

X T

C E

1 2 3 4

5 6 7 8

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

1

2

3

456

321

S1

1

2

3

4

5

P1

C1 C2

.068 .068

C4 .01

R13

C3 .01

L1

L2

+

-

BT1

D2D1

R14

R17

.01

C11

LPF1

LPF2

To Ctrl Board, J 2To Ctrl Board, J 1

must be removed when the KAF2 is installed.

3.9K

RP11 2

3.9K

RP1

7

8

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

AF1AF2

SETSET

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

7/26/2019 2005 K2 Schematics


20

K60XV Schematic

W. BurdickE. Swartz

Elecraft

1 of 1

Rev. Sht.DateBy

P 1

1

2

3

4

5

6

7

8

K1A

2 43

2.2

C5

C1 C2C3 C4

4 7 4 7

M C L R

O S C 1

O S C 2

R A 2

R A 3

R A 4

V S S

R B 0

R B 1

R B 2

R B 3

R A 1

R A 0

V D D

R B 7

R B 6

R B 5

R B 4

1 0

1 1

1 2

1 3

1 4

1 5

1 6

1 7

1 8

1 2 3 4 5 6 7 8 9

U1

Z1

R1

.001C124 MHz 10 0

16C621A

K1B

97 8

P 2

1 2 3

4. 7

C6

1 1 0

K2

K1

6V

K60XV 60m/XVTR IO

To XVTR I/O

K2A

2

4

3

.0 1

C11

C9K2B 9

7

8

D2 D1

C8 C7

1 2 3 4

J 1

R7

BPF

TX IN

6V

.0 1

C13

8 - 5 0 8 - 5 0

To 40/60m BPF

5082-3081 5082-3081

.0 1 .0 1

XVTR RF

OUT IN

47 0

MCU

.0 1

/L P

/L P

AUXBUS

3

2

1+

-

8

4

U2A

5

67+

-

U2B

D3

1N5711

R3

470K

R5

1M

R2

1M

.001

C10

D4

1N5711

R6

91 K

6LPQ2

R4

100K

PN2222A

Q1R9

2N390610 K

6V

6T

Q3

2N7000

6T

TX RF

RFC1

15µH

TX RF

R8

47 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.

.0 1

C14

1 2 3 4 5

J 2

.0 1

C16

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 )

*

*

R10

10 K.0 1

C15

1 GROUND

3 XVTR SELECT 0

4 XVTR SELECT 1

5 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

7/26/2019 2005 K2 Schematics


K 6 0 X V M A N U A L E R R A T A

R e v . A - 3 , J u n e 8 , 2 0 0 4

PLEASE MAKE THE FOLLOWING CHANGES TO THE MANUAL BEFORE

PROCEDING 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 when

using 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-power

operation 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 the

K2’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 autotune

modes (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 holding

DISPLAY 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 from

developing 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 bottom

of the KAT2 control board, and can be changed without removing the KAT2 module.

2005 k2 schematics

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