ELECRAFT K 2 Betriebsanleitung

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

Power Amplifier (PA)12:8, FT37-439:3, FT37-43K2 RF BoardPRE-DRIVERPre-DriverW. BurdickElecraftE.Swartz2SC2166(Sh. 3)(Sh. 3)2SC19692SC1969PA BiasPN222

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

W. BurdickE. SwartzElecraftRev.Sht.DateByAntennaJ2GND Post30pF1N57111N57113.3KC1C95C87C88100.001.001200100KR28D16D17R29R27R26T4E14321321+-U5A567+-84U5

Low-Pass FiltersW. BurdickE. SwartzElecraftRev.Sht.DateByKPA1002 of 2PIC16C72AUXBUS78L05MCLROSC1OSC2C23C25.001RA4RC0RC1RA0RA1RA2RA3RA5VSSRC2RC3 RC4RC5

K 2 / 1 0 0 M A N U A L ( A p p e n d i x G ) E R R A T AR e v . C - 3 , D e c e m b e r 1 4 , 2 0 0 4P L E A S E R E A D B E F O

24SSB Crystal FilterCompressorW. BurdickE. SwartzModulatorElecraftBalancedBUF OUTSSM21654.0 MHzSpeechVCA INAUXBUSAF IN100µH100µHRev. Sht.OUTBCOMPRFC12

Elecraft www.elecraft.com 831-662-8345 Elecraft SSB B/W Modification (SSBCAPKT) Installation Instructions Revisi

Elecraft www.elecraft.com 831-662-8345 The wider bandwidth filters require that the BFO be tuned to a higher freque

11K160RX SchematicW. BurdickE. SwartzElecraftRev. Sht.DateC1 C2C3150027001500ByL1 L2243978K210 11 12 13 14 15 161 2345 67 89J1243978K1160m/RX ANT. Mod

Elecraft • www.elecraft.com • 831-662-8345Circuit DetailsU1 amplifies the I.F. signal, which is then detected by D2 (1N34A). Q1 redu

7(+)(-)3" Red7.5" Red7"Black12"RedDetail BFigure 3

23Circuit Details, KAT2 L-C BoardThe L-C board provides eight series inductors and eight parallel capacitors, configured as an L-network. Thecapacitan

24Circuit Details, KAT2 Control BoardT1, D1, D2 (etc.) form a directional coupler for SWR and power measurements. This type of bridge is much moreaccu

W. BurdickE. SwartzElecraft10.4 µH.64 µH 1.3 µH 2.6 µH 5.2 µHRev. Sht. .08µH .16µH.32µHDate12000.10.10.10.1K11 K12 K14K2 K5K8 K9150150150C10C11C12C13C

W. BurdickE. SwartzAntenna 1Antenna 2L OUTElecraftL IN780525LC3204.0MHzRev. Sht. 16F877/HOLDDateMCLROSC1OSC210 µFOUTC420.1C43MCURA4RC0RC1RA0RA1RA2RA3R

W. BurdickE. SwartzElecraftRev. Sht. DateBy1 of 15A(based on LED Vf=1.9V)PN2222A.047R116220R1154705AC102Q102Q101Brightness Control4.0V DAY (18mA/LED)2

24W. BurdickE. SwartzElecraftRev. Sht.DateBy1 of 10.1C15= On bottom of PC board.123456789J110123456789J2To PCTo CTRL BoardOUTGNDINU278L055V0.1C12T2OU

49

50

1632.768 kHz3.9K10K10KRP1R9R10X1343.9KRP165W. BurdickE. SwartzElecraftRev. Sht.DateBy1 of 1= On bottom of PC board.GNDOUTINMCLROSC1OSC2RA2RA3RA4VSSRB

LOW-PASSFILTERSPOWERAMP(15W)BAND-PASSFILTERST-RCRYSTALFILTERSAppendix C BLOCK DIAGRAMW. Burdick/E. Swartz Rev. D 1-9-04ATTEN.ANDPREAMPRCVMIXERPO

20K60XV SchematicW. BurdickE. SwartzElecraft1 of 1Rev. Sht. DateByP112345678K1A2432.2C5C1 C2C3C44747MCLROSC1OSC2RA2RA3RA4VSSRB0RB1RB2RB3RA1RA0VDDRB7RB

K 6 0 X V M A N U A L E R R A T AR e v . A - 3 , J u n e 8 , 2 0 0 4PLEASE MAKE THE FOLLO WING CHANGES TO THE MANUAL BEF OREPROCEDING TO

portion of the indicated capacitance range is actually used to covereach Amateur band segment. VCO frequency can be calculated based on** Based on an

(S0 through S23 connected to DS1; only S0 and S23 shown)First switch label corresponds to switch TAP,Second label corresponds to switch HOLD.VIM-838-D

Note: Current sense resistor8V Low-Dropout Reg.K2 Control BoardVoltmeter InputQuad, 8-bit DACTo RF Board, J7To RF Board, J8To RF Board, J6Current Se

F r o n t P a n e l B o a r dRelays are shown in RESET (Vout = 0 to 4.096V)VFO Range SelectionKey/Keyer/PaddlePLL SynthesizerPLL Reference0.05Ω,

N o i s e B l a n k e rS S B A d a p t e rBFO Buffer/Attenuator2nd Xtal FilterPost-Mixer Amp.RP4, RP5: 100KK2 RF BoardProduct Det.V BIAS-XFILW.

RF Output DetectorBand-Pass FiltersI n t e r f a c eLow-Pass FiltersX v e r t e rK2 RF BoardW. BurdickBPF RelaysPRE-DRIVERVCO RelaysE. SwartzPre/Attn