Elecraft_K-3_sch_2010.pdf

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1、Elecraft K3 Schematics This document contains the schematics for the Elecraft K3 Transceiver and its internal options. The schematics are preceded by a Block Diagram for context. The schematics are ordered as the basic K3/10, then various options. BLOCK DIAGRAM K3/10 RF Board Main module Band Stop F

2、ilter 1st IF rejection Mixer High dynamic range 1st mixer Crystal Filter Roofing filter KIO3 I/O module KANT3 Antenna Connector if no KPA3 installed KNB3 PreIF Noise Blanker KREF3 Reference oscillator, Tx mixer/Filter, Rx 2nd Mixer KSYN3 Synthesizer Front Panel Control logic DSP Digital Signal Proce

3、ssing DSP LPF Optional retrofit for earlier DSP boards 10watt PA Low power amplifier OPTIONS KBPF3 General Coverage Receiver Bandpass Filters KXV3 Transverter Interface and Receive Antenna Switching KXV3A Transverter Interface and Rx Ant Switch w/K144XV Support KAT3 100watt Antenna Tuner DVR Digital

4、 Voice Record/Playback KPAIO3 Part of 100watt PA KPA3 Part of 100watt PA AuxDSP Part of KRX3 Second Receiver KRX3 Part of KRX3 Second Receiver K144XV Internal 2m Module Copyright 20072010, Elecraft, Inc. All Rights Reserved. 64 K3 Block Diagram 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 2

5、8 29 30 31 32 33 34 35 36 1 2 3 4 5 6 7 8 9 J76J76 KIO3KIO3 P44EP44E 123 P44CP44C 123 SPKR_R SPKR_L AUXBUS RXD TXD /KEY_IN /PTT_IN W. Burdick Elecraft Rev. Sht. DateBy Appendix Appendix B B K3 K3 RF RF BoardBoard SCK3 MOSI3 7R 7T 40 40 40 40 27 C120 C157 C144 K6A K6B C86 C154 C126 C174 C188 C182 K8A

6、 K8B C149 C181 C185 C136 C78 C79 C84 150 560560 150 470 39 2 39 470 220 2 220 K1A K1B C81 1300 C82 1300 K7 L18 2 4 3 9 7 8 2 4 3 9 7 8 2 4 3 9 7 8 24 3 9 7 8 J12J12 J15J15 Key Key OutOut J14J14 PTT PTT InIn PaddlePaddle FSK IN XVTRON 1 2 3 4 5 6 P44AP44A 5A SCK3MISO3 LD_IO MISO3 K6 K5 K8 K9 K3 1 K1

7、1 10 SRCK SOUT /CLRRCK SIN VCC /Q0 /Q1 /Q2 /Q3 /Q7 /Q6 /Q4 /Q5 GND 10 15 14 13 12 11 16 /G 9 2 3 1 4 5 6 7 8 U4 SCK3 MOSI3 .01 C165 C163 C164 C108 C75 C160 C90 5A TPIC6C595D K7 K4 1 10 SRCK SOUT /CLRRCK SIN VCC /Q0 /Q1 /Q2 /Q3 /Q7 /Q6 /Q4 /Q5 GND 10 15 14 13 12 11 16 /G 9 2 3 1 4 5 6 7 8 U2 SCK3 C11

8、1 C191 5A TPIC6C595D MOSIBPF2 Band-Pass Filters MISO3 1 of 4 /PWR_ON 40 C180 40 C184 L13 1.0 L12 1.0 L11 1.0 40 C135L10 1.040 C134 4040 4040 C119 C156K3A K3B C153 C125 C146 C179C183 C133 1000 100 100 1000 K4 2 4 3 9 7 8 24 3 9 7 8 L9 4.5 40 C132 L8 4.5 40 C131 C118 C155 K5A K5B C152C124 820 120 120

9、820 2 4 3 9 7 8L7 1.0 40 C130 L6 1.0 40 C129 C142 5 C123 100C122 100 C117 56 C116 56 L5 4.5 L4 K2A 2 4 3 K2B 97 8 C173 1500 90 C178 C172 1500 90 C177 L3 0.25L2 0.25 L1 0.25 C141 3.9 C140 3.9 K9A 2 4 3 K9B 9 7 8 20 C128 Q3 IRFI630 G D S R4 10K RFC4 100 RFC3 RFC2 RFC1 /DASH /DOT /KEY_IN /PTT_IN C74 C1

10、07 C92 .001 C89 20C148 C13933 C187 33 20C147 C13833 C186 100 .01 C190 (Attn., SH. 4) K10 C93 LINE_IN- BK_MICAF- LINEOUT_R BK_PH_L BK_PH_SW LINE_IN+ BK_MICAF+ LINEOUT_L BK_PH_R ALC 12U N:10 C223 22 C99 .047 Aux. Aux. BPFBPF L33 11.5 8.215 MHz 11 C218 K2 .01 C240 RelaysRelays BPF BPF C236 .047 C61 .04

11、7 RelaysRelays BPF BPF 6 6 mm 10/12 10/12 mm 15/17 15/17 mm 20/30 20/30 mm 80/160 80/160 mm 40/60 40/60 mm + C2 + C3 470 F C231 .047 C239 .047 C189 .01 (80)(80)(160)(160) (10/12 m) (15/17 m) (40/60 m) (20/30 m) (6 m) (80/160 m) (80 or 160 m) (17/10 m or 15/12 m) (60/20 or 40/30 m) (60/20) (40/30) (1

12、7/10) (15/12) L16 1.2 C1 390 Q5 2N7002 G D S 7R 100 C251 J13J13 KeyKey RFC49 12A 12B 12B 12B 12B MOSIBPF1 .01 C274 .015 C275 250V 12B 10 BPF_IF2 BPF_IF2 R28 100 LD_BPF LD_BPF2 LD_BPF2 P44A/C/EP44A/C/E 10 11 12 1 2 3 4 5 6 7 8 9 J64AJ64A Sub Sub RcvrRcvr 7R 7T BPF_RF W 4W 4 SUBRX SUBRX BYPBYP (Sh. 2)

13、 C50 24 1 3 2 4 5 Z3Z3 Stop-Band Stop-Band FilterFilter W30W31 W32 W33 RFC36 100 R72 470 L35 11.5 8.215 MHz 11 C257 C71 24 BPF_IF W15 RF CHOKE RFC53 Set = 12-6m L34 C276 C259 5600 RX: -20 dB 0.5 MHz L34/C276 not used B21/8/10 W. Burdick Elecraft Rev. Sht. DateBy Appendix Appendix B B K3 K3 RF RF Boa

14、rdBoard 10 11 12 P30P30 13 14 1516 17 18 19 2021 22 23 24 25 26 27 28123456789 Front Front PanelPanel 12345 P35P35 AUXBUS /PTT_IN /DOT /DASH /KEY_IN /CSRFMUX ADR0 ADR1 ADR2 ADR3 MOSI VRFADC FCT RXD TXD XVTRON /SPI_23_EN 12 J10J10 J11J11 12V 12V OutOut 12V 12V InIn D34 1N4007 D6 SB530 F1 6A FDS6375 Q

15、2 G D S D28 BZW50-15 R76 2.7K OUT GND IN U13 OUTA OUTB INA GND INB V+ NC NC 1 2 3 45 6 7 8 U11 TC4427 OUT GND IN U12 7R 7T 8A 3 of 4 5A8A 5R5T MOSI ADR3 ADR2 ADR1 ADR0 /CSRFMUX SCK3 LD_XV LD_IO LD_BPF MOSI2 LD_SYN2 LD_SYN1 /CSPLL2 /CSPLL1/CSDDS2 /CSDDS1 LD_IF_S LD_LPF LD_ATU LD_IF MOSI3 TDI GND TMS

16、VCC GND VCC GND TCK VCC TDO GND VCC 25 14 5 31 2122 16 17 6 30 8 28 18 15 24 3 26 19 20 29 27 23 32 2 44 43 3642 40 39 38 4137 35 34 IO IO IO IO IO IO IO IO IO IOIO IO IO IO IO IO IO IO IO IO IO IO IO IO IO IO IO IO IO IO IO IO 1 12 10 4 13 33 7 11 9 U7 CPLDCPLD ATF1502 /SPI_23_EN CH6CH2 VEE COM CH5

17、 INH CH1 VSS VDDCH4 CH7 CH3 CH0 10 11 12 13 14 15 16 B A C 1 2 3 4 5 6 7 89 U6 V12SPA VRFADC VTPA VIPA 4051 R12 R11 MISO2 MISO3 2.7K C66 .01 C54 .01 VI_LO 2.7K VIFGAIN2 10 11 12 13 14 15 16 17 18 19 20 1 2 3 4 5 6 7 8 9 J73J73 Synth Synth 1 1 8A /CSPLL1 /CSDDS1 5A LD_SYN1 10 11 12 13 14 15 16 17 18

18、19 20 1 2 3 4 5 6 7 8 9 J74J74 Synth Synth 2 2 8A 5A LD_SYN2 /CSPLL2 /CSDDS2 MOSI2 MISO2 SCK2 MOSI2 MISO2 SCK2 10 11 12 13 14 15 16 17 18 19 20 1 2 3 4 5 6 7 8 9 P50P50 DSP DSP A.F. A.F. I/OI/O 10 11 12 13 14 15 16 17 18 19 20 1 2 3 4 5 6 7 8 9 P51P51 DSP DSP I.F. I.F. I/OI/O RX1_IF- VIFGAIN1 100HZ

19、RX2_IF- VIFGAIN2 VREFL RX1_IF+ TXIF+ RX2_IF+ VFWD BK_PH_R LINEOUT_L BK_MICAF+ SPKR_L SPKR_R BK_PH_SW LINEOUT_R BK_MICAF- FSK IN TXIF- C58 470F + MC7805ACTMC7808ACT C57 470F + C56 220F + LINE_IN+LINE_IN- ZXTC1010 LOAD IOUT GND VIN NC 1 2 3 4 5 U1 R360.05 VI_LO R13 1K FSK IN R14 100 12A RFC6 C31 .047

20、C42 .047 RFC5 5A /PWR_ON C62 .01 C60 BT1BT1 3 3 V V Batt.Batt. ALC BK_PH_L C220 .047 MOSI3 MISO3 LD_IF_S 100 + + - - 12U 12PA R77 2.7K C226 .047 RFC40 C224 .047 C225 .047 VCO1 VPLL1 12A VPLL2 12A SCK3 5A 5A + - X LOAD DOUT /OE GND VDD DIN SCKVBB Q10Q7 Q6 Q1 Q5 Q8 1011 12 Q3 13 Q2 14 15 16 NC NC Q4 1

21、7 18 19 Q9 20 1 2 3 4 5 6 7 8 9 U10 A6810 SCK3 LD_IF 5A R82 R78 R79 R81 R80 MOSINB MOSI3 R78-R82 = 100 PRE_ON PRE_OFF TXMIXFIL R2 470 C246.047 C247 .047 C248 .047 RX2_IF- RX2_IF+ 5A C69 .047 VPLL2 VPLL1 10 1 2 3 4 5 6 7 8 9 P79P79 CPLD CPLD PgmPgm HAGC1 HAGC2 HAGC2 12345678 J75J75 Ref./2nd Ref./2nd

22、LO/2nd LO/2nd TXTX 100HZ TXMIXFIL RFC23 100 7T C222 0.1 1.8K R5 TXIF- TXIF+ FL4 FL5 FL1 FL2 FL3 C255 .047 C254 C253 .047 C252 RFC43 100 RFC44 100 C35 10 F 5A NB1LVL R87470 VFWD R88470 VREFL 100HZ RFC47 100H 12D 12D 5D 5D 101112123456789 J64BJ64B Sub Sub RcvrRcvr C270 .01 C265 0.1 C271 .01 RFC48 C272

23、 .047 10H BW1 BW3 BW2 MISO SCK MISO SCK R91 100 SCK2 SCK3 ALT (TBD) OUT GND IN U17 78L09 C45 10F 12A LD_BPF_S LD_BPF_S + 12A Q11 10K R27 BC807 1H C35A (not used) 9V R98 10K R99 10K 5A R100 1K D35 1N4007 F2 0.6A W34 1/8/10B2 * * * = = Recent Recent ChangesChanges VPOST (Jumper, rev. A PCB) * * P95 12

24、V TO K144XV * R31 D23 470 1N914 * * D23-24 and R31-32 Are not on rev A PCB R32 D24 470 1N914 * * * (CUT) (CUT) * Vfwd/Vrefl traces P51 must be cut on rev A PCB W. Burdick Elecraft Rev. Sht. DateBy Appendix Appendix B B K3 K3 RF RF BoardBoard NE46134 150 C204 C202 C195 R60 R75 6.2 R66 .047 100 68 100

25、 Q8 .047 R45 R37 R43 .047 15 C211 .047 12A SCK3 MISO3 MOSINB LD_IF RFC39 47 H NB1LVL 12A 5 6 7 + - U15B 3 2 1 + - 8 4 U15A 1 4 2.7K RP1 3 C201 0.1 C215 51 33KR42 6.2 R33 1 2 C214 1.0F C200 0.01 C213 51 33KR41 6.2 R40 2.7KRP1 16 C212 1.0F C199 0.01 C48 64-04 D22 64-04 D21 RFC27 100 D33 T5 4 3 1 2 G D

26、 S Q1 C47 C46 R30 R29 R26 C44 R25 C43 RFC25 100 RFC24 100 C40 C39 J309 C198 220F100 R39 12A + .047 .047 .047 100 .047 22 1K .047 0V = MAX GAIN, 3V = MIN LM833 27 C19 .01 C17 R23 .047 560 R21100 C12 C11 RFC20 RFC18 R19100 C10 C9 RFC17RFC16 R18100 C8 C7 RFC15RFC14 R17 100 C6C5 RFC13RFC12 R16 620 RFC11

27、 100 Crystal Filters FL4 FL3 FL2 FL1 VCO1 12345 Z1 560 R63 Preamp NE46134 220 470 C209 R67 R59 R62 R74 18 0.1 R65 Q4 15 18 C210 .01 1K R61 RFC10 100 R73 1K C106 100 RFC9 100 7T C207 68 RFC34 100 C221 .047 2 4 3 9 78 K10 Attn. C194 .047 R70 470 C206 68 C205 100 C15 C16 RFC38 100 RFC8 100 PRE_OFF C26

28、15 R20100 C14 C13 RFC21RFC19 C203 0.1 R68 8.2 FL5 7R C41 R22620 R15 1K C4 R69 470 RFC35 100 R1 470 C208 .047 C193 .047 RFC37 100 -10 -10 dBdB 4 of 4 T6 1 3 2 4 .047 D8 64-04 D7 D9 D10 C21 15 D17 D18 C25 15 D15 C24 15 D13 C23 15 D11 C36 22 C22 22 D20 D19 C29 22 D16 C28 22 D14 C27 22 D12 D5 D4 D3 64-0

29、5 D2 12A C228 .047 RFC41 100 C233 .047 PRE_ON 1 2 P86P86 I.F. I.F. OutOut Q9 R56 8.2 RFC29 100 H .047 C229 .047 8A RFC42 100 C232 .047 6T D1 .047 C242 .047 C243 .047 C245 .047 C244 .047 .047 2.7K RP1 51 (not used) 8A C237 .047 G S D Q10 J309 C55 .01 R8 13K RFC22 100 R9 220 C68 .047 C59.047 7R RX1_IF

30、- RX1_IF+ C4-C14 C4-C14 = = .047 .047 FFRFC12-RFC21 RFC12-RFC21 = = 100 100 HH R7 1.8K 51 8A C196 .01 C197 .01 D29 BAV99 D30 C238 0.1 R86 4.7M HAGC1 3 2 1 + - 8 4 U3A V- V+ 1 2 3 5 4 6 7 8 U9 C249 1.0F SA612 J81J81 RXLO2RXLO2 J65J65 TXIF1TXIF1 C20 .01 TP1 TLV2462 R10 100 C250 .047 R83 100 7R-2 7R-2

31、C37 .047 7T-2 7T-2 7T R84 100 C256 .047 7R 7R-2 (W6)(W6) C30 120 C34.047 C32 .047 C258.047 X1 BW = 14 kHz 2nd RX Mixer (W14)(W14) P45A P46A P47A P48A P49A P45B P46B P47B P48B P49B C262 .01 I.F. Amp C38 .01 R6300 R3300 R24 18 8.230 MHz (W7)(W7) 8.215 MHz R64 620 W17W17 W18 1234 P45C 12B 1234 P46C 123

32、4 P47C BW3 BW2 BW1 RFC7 100 7T C273 .047 W16 W22W22 Post-amp (Not (Not on on rev. rev. XA XA PCB.)PCB.) FL5FL5 FL4FL4 FL3FL3 FL2FL2 FL1FL1 10 11 12123456789 J77J77 Noise Noise BlankerBlanker HAGC Det. 5A 5 6 7 + - U3B VIFGAIN1 FL5/4/3 FL5/4/3 BW BW ControlControl XF2 M1 M2 8A BAV99 D38 +11 +11 dBdB

33、R89 4.7K L36 18 X2 C49 10 L37 27 C18 0 L39 2.8 L38 2.8 RFC50 100 C285 150 16:5 BPF_IF 470K R85 D32 Not on Rev A PCB XF1 R1021.8K D40 R101 on Rev A PCB Not on Rev A PCB B21/8/10 VPOST* * * = = Recent Recent ChangesChanges * * C:ElecraftHenryModulesBetaBSFSchematicBSF.sch - Sheet1 C:ProjectsK3Schemati

34、csKR MixerRevXC.sch - Sheet1 C4C5 X2X3X4 C6C3 X1X5 C2 C7 L1 L2 C1 C8 E660032: E660032: 8.2125 8.2125 MHz MHz +/- +/- 200 200 Hz; Hz; Lm Lm = = 25 25 mH mH +/- +/- 2 2 mH, mH, Co Co 100 100 K K E660027: E660027: 8.214 8.214 MHz MHz +/- +/- 200 200 Hz; Hz; Lm Lm = = 25 25 mH mH +/- +/- 2 2 mH, mH, Co

35、Co 100 100 K K * * For For CW CW bandwidths, bandwidths, X1-X5 X1-X5 must must be be hand-selected hand-selected to to 10 10 Hz, Hz, and and for for SSB SSB bandwidths, bandwidths, 50 50 Hz.Hz. CACB 8.215 MHz 500 250 Hz 150 pF 750 pF 750 pF 750 pF 750 pF 750 pF 750 pF 0 pF 2.3 H E660027 8.215 MHz 50

36、0 6000 Hz 0 pF 62 pF 47 pF 62 pF 47 pF short 62 pF 10 pF 16 H X1, X3, X5 = E660027; X2, X4 = E660032 8.215 MHz 500 1000 Hz 63 pF 180 pF 240 pF 180 pF 240 pF 180 pF 240 pF 0 pF 3.9 H E660027 8.215 MHz 500 3000 Hz 0 pF 51 pF 51 pF 51 pF 51 pF short 51 pF 0 pF short E660032 (4-crystal filter w/1dB ripp

37、le; X5 = short) Fc Fc Zin/out Zin/out BW BW -6 -6 dB dB C1,C8 C1,C8 C2 C2 C3 C3 C4 C4 C5 C5 C6 C6 C7 C7 CA,CB CA,CB L1, L1, L2 L2 Crystal Crystal p/n, p/n, Inductor Inductor Windings, Windings, NotesNotes 8.215 MHz 500 500 Hz 120 pF 470 pF 390 pF 470 pF 390 pF 470 pF 390 pF 0 pF 2.8 H E660027; L1, L

38、2 = 24 T #28 on T30-2 12 J 1J 1 1 2 J 2J 2 To To RF RF Board, Board, P45A-P49AP45A-P49ATo To RF RF Board, Board, P45B-P49BP45B-P49B FL1 CC .01 CD .01 Filter Filter ModuleModule NOTES:NOTES: 2. 2. CC CC and and CD CD are are used used with with a a filter filter module module (FL1). (FL1). All All ot

39、her other components components are are only only used used for for constructing constructing a a discrete discrete filter.filter. 3. 3. X1-X5 X1-X5 can can be be either either 2- 2- or or 3-lead 3-lead HC49/U HC49/U types. types. Grounding Grounding pads pads are are provided provided for for both.

40、both. 2 1 4 3 W. Burdick E. Swartz Elecraft Rev. Sht. DateBy 1 of 1 KFL3A Filter Board 1. 1. This This PCB PCB can can be be used used to to assemble assemble a a discrete discrete 5-pole 5-pole crystal crystal filter, filter, or or as as a a carrier carrier for for filter filter modules modules (IN

41、RAD, (INRAD, etc.).etc.). 8.215 MHz 500 2700 Hz 0 pF 110 pF 47 pF 68 pF 68 pF 51 pF 68 pF 0 pF short E660032 8.215 MHz 500 3000 Hz 0 pF 62 pF 47 pF 62 pF 47 pF short 62 pF 0 pF short E660032 (4-crystal filter w/0.5 dB ripple; X5 = short) B 6/20/07 8.215 MHz 500 200 Hz 120 pF 2700 pF 620 pF 1000 pF 1

42、000 pF 620 pF 2700 pF 0 pF 2.8 H E660027 5 5 4 4 3 3 2 2 1 1 DD CC BB AA Mounting Holes for KIO3 Faceplate 2005042501C KIO3 Main Elecraft, Inc. Copyright (C) 2007 - 2010. L Johnson B 13Wednesday, June 16, 2010 Title SizeDocument NumberRev Date:Sheetof Sheet 2 BAND2 /PWR_ON /PTT_IN DTRA nKEYOUT DIGOU

43、T0 DIG0 AUXBUS DIG1 RTSA BAND1 RXD BAND3 ALC TXD DIGOUT1 BAND0 Sheet 3 BK_MIC_AF+ BK_MIC_AF- LINE_IN+ LINE_IN- BK_PH_L BK_PH_R SPKR_L SPKR_RSW MICBIAS LINEOUT_L LINEOUT_R BK_PH_SW ALC BK_PH_SW BK_PH_R BK_PH_L LINEOUT_R BK_MIC_AF+ LINE_IN+ /KEY_IN MOSI_3 +8T +12SW +12UNSW AUXBIUS SPKR_R MOSI_3 LD_IO

44、MICBIAS RTSA /KEY_IN BAND1 BAND0 BAND2 DCTRL1 nKEYOUT DTRA DCTRL3 /PWR_ON RXD TXD DIG1 DIG0 LINE_IN- BK_MIC_AF- LINEOUT_L SPKR_L +8R +8R LD_IO LD_IO /PTT_IN /PTT_IN DCTRL2 DCTRL0 BAND3 DIGOUT0 DIGOUT1 MISO_3 /RSPKEN /RSPKEN VCC5 VCC5 VCC5 +12SW +12SW +12SW VCC8A VCC5 +12SW U3 UA78M08CDC 1 24 3 +VIN

45、GNDTAB OUT R81K U5 TPIC6C595D 3 4 5 6 11 12 13 14 9 2 15 7 10 8 1 16 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 SDO SDI SCK SCLR RCK OE VCC GND TP1 GND 1 2 A B C28 100 pF R1810K R25 470R C16 0.1 uF C22 0.1 uF Q3MMBT3904 1 23 Q7 MMBT3904 1 2 3 Q4MMBT3904 1 23 RP1A100K 18 C14 0.1 uF RP1D100K 45 R23 100R P76 RF Board 1 2

46、 3 4 5 6 7 8 9 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 Q6MMBT3904 1 23 C15 0.1 uF Q8 MMBT3904 1 2 3 U2 UA78M05CDC 1 24 3 +VIN GNDTAB OUT + C11 10 uF/25V U6 TPIC6C595D 3 4 5 6 11 12 13 14 9 2 15 7 10 8 1 16 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 SDO SDI SCK SCLR RCK OE VCC G

47、ND RP1B100K 27 MT1 1 Q5MMBT3904 1 23 RP210K 12 3 4 5 6 7 8 910 C27 0.1 uF R16 10K R26 470R + C8 10 uF/25V K1 DPDT 3 2 4 8 9 7 1 10 MT2 1 RP1C100K 36 R121K 5 5 4 4 3 3 2 2 1 1 DD CC BB AA ACC COM ACC DO1 Approximately 1 kHz ACC DO0 ACC BND1 RS232 TXD ACC BND2 RS232 RTS ACC DI1 +5V ACC DI0 ACC BND0 RS

48、232 DTR RS232 COM ACC ALC ACC PWR ACC KEY ACC AUX RS232 RXD ACC PTT ACC BND3 2005042501C KIO3: Main, Sheet 2 Elecraft, Inc. Copyright (C) 2007 - 2010. L Johnson A 23Wednesday, June 16, 2010 Title SizeDocument NumberRev Date:Sheetof D0 TXD BAND3 /PTT_IN DTRA RXD_X DTR_X RTSA nKEYOUT T1 BAND2 /PWR_ON BAND0 BAND1 AUXBUS ALC DIG0 RTS_X DIGOUT0 DIGOUT1 TXD_X DIG1 RXD +12SW VCC8A VCC5 VCC5 R6 10R Q2 2N7002K 1 32 C31 1000 pF R5 2.7K R11K C41 1000 pF