2005 K2 Schematics
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Transcript of 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
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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
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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).
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(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.
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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)
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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.
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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).
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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.
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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
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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
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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
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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
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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.
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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
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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.
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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.
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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
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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).
= On bottom of PC board.
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
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7
(+)(-)
3" Red7.5" Red
7"Black
12"Red
Detail B
Figure 3
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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
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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
= 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
3.3K
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
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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
= On bottom of PC board.
= 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
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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).
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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
= On bottom of PC board.
D101-D114
ANODE
CATHODE
L O A D
KAT100 Front Panel Board
Appendix A
B 1 / 4 / 0 3
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24
W. Burdick
E. Swartz
Elecraft
Rev. Sht.DateBy
1 of 1
0.1
C15
= On bottom of PC board.
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
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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
= On bottom of PC board.
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
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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
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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.