ELECRAFT KAF2 User's Guide

Rework Eliminators™ Companion Guide Rework-Free Assembly Instructions for use with the rev. F Elecraft® K2 Manual Version 8 / Revision C 6 June 201

- 7 - Δ Do not install jumper wires R18 and R19 on the back of the board. Instead, install connectors J1 and J2 on the front as follows. [

- 8 - KAT2 KBT2 KPA100 KAF2 KDSP2 KNB2 K160RX K60XV KSB2 Multiple REW•RK-FREE K2 ASSEMBLY The K2 manual is the intellectual property of Elecraf

- 9 - KAT2 KBT2 KPA100 KAF2 KDSP2 KNB2 K160RX K60XV KSB2 Multiple REW•RK-FREE K2 ASSEMBLY The K2 manual is the intellectual property of

- 10 - REW•RK-FREE K2 ASSEMBLY The K2 manual is the intellectual property of Elecraft, Inc, copyright © 1999-2012, all rights reserved, used wit

- 11 - [ ] Install a Rework Eliminator™ UN-KAF2/UN-KDSP2 un-module option bypass header at CTRL-J1 / J2. KAT2 KBT2 KPA100 KAF2 KDSP2 KNB2 K160

- 12 - 1) Do not install anything at R90. 2) Instead of the original R89, install W89 (i.e. just a bare jumper wire). 3) Instead of the original

- 13 - * Older rev. ‘A’ RF boards (supplied with pre-S/N 3000 K2s) do not have mounting locations for these diodes. If you are assembling an old

- 14 - See note 1 Δ Do not install W5, the Noise Blanker option bypass jumper. Δ Do not install W2 and W3, the SSB Crystal Filter option by

- 15 - * W6 is the Transverter I/O option bypass jumper. Δ Do not install W1, the Receive Antenna option bypass jumper. Δ Do not install W6*

- 16 - __ C75, 470 (471)* __ C13, 1200 (122)* __ C14, 1200 (122)* * These three caps are provided with the Elecraft® K160RX or the Re

- ii - Revision History Date(s) Version Revision(s) Changes 6 JUN 2012 8 C • Updated the price in Appendix A (footnote 5). 5 JUN 2012 8 B • Mi

- 17 - 1) Install J9*, J10*, & J11* per the steps on page 13 of the Elecraft® KSB2 manual. 2) Install J12* per the steps at the top of pag

- 18 - [ ] Change the Extended VFO Range (D19) Secondary Menu to Y*. KAT2 KBT2 KPA100 KAF2 KDSP2 KNB2 K160RX K60XV KSB2 Multiple REW•RK-FRE

- 19 - [ ] If some of the above VCO control voltage readings are < 1.0 V, or some of them are > 7.5 V, you may be able to shift the en

- 20 - See note 1 1) In order to protect them from physical damage during subsequent assembly, temporarily remove all Rework Eliminator™ option

- 21 - KAT2 KBT2 KPA100 KAF2 KDSP2 KNB2 K160RX K60XV KSB2 Multiple REW•RK-FREE K2 ASSEMBLY The K2 manual is the intellectual property of Elecra

- 22 - [ ] Re-install all un-module bypass headers on the RF and CTRL boards. KAT2 KBT2 KPA100 KAF2 KDSP2 KNB2 K160RX K60XV KSB2 Multiple REW

- 23 - Appendix A – Required K2 PCB Parts The following table lists all of the parts – electrical components, connectors, miscellaneous wire, and

- 24 - “Option Ready” Support for This Elecraft® Option Requires Either of These Kits Which Supply These K2 PCB Parts Elecraft® Rework Eliminator

- 25 - Appendix B – Annotated K2 Schematics The schematics on the following six pages are annotated to depict the configuration of an “Option Read

- 26 - The K2 schematics are the intellectual property of Elecraft, Inc, copyright © 1999-2012, all rights reserved, used with permission.

- iii - Preface and Acknowledgements My investigation into the possibility of a rework-free K2 build began in December 2004 after I completed a Hi

- 27 - J1 & J2 supplied with KAF2 & KDSP2. Appendix B The K2 schematics are the intellectual property of Elecraft, Inc, copyright © 199

- 28 - NOTE 4: Pre-S/N 3000 K2s (those with the earlier rev. A RF board) don’t have mounting holes for R29. (NOTE 4) (NOTE 5) NOTE 5: C68 is 10

- 29 - 2.7 k 0 Ω W89 The K2’s original R88 is replaced with KNB2 supplied 2.7 k R88. The K2’s original R89 is replaced with W89, a zero ohm j

- 30 - ⌂ V RFDET P6 supplied with KAT2 & KPA100. J15, J13, and the RG174 coax cable for jumpering V RFDET to J13-6, are supplied with the

- 31 - All components shown on RF Sheet 4 are provided with the K2. The K2 schematics are the intellectual property of Elecraft, Inc, copyright ©

- 32 - Appendix C – Color-Coded K2 Un-Module Diagram The K2 schematic diagram is the intellectual property of Elecraft, Inc, copyright © 1999-2

- 1 - Introduction This guide describes a rework-free assembly method for the Elecraft® K2. It incorporates un-module option bypass headers and 4

- 2 - How to Use This Guide 1. Based on which options you are initially getting with your K2 and which options you want to build it “Option Ready

- 3 - This image of #5048 shows three items which are not part of an “Option Ready” K2: 1) Ken’s custom brass plate; 2) the “option supplied” h

- 4 - Rework-Free Assembly Summary  # Option(s) PCB DELETED STEPS ADDED STEPS NOTES!  17 KAF2 & KDSP2 CTRL Do not install R18 & R19

- 5 - Rework-Free K2 Manual Annotations 1. The color code above is used on the previous page and all following pages, to indicate for which opti

- 6 - Δ Be sure that the following electrolytic caps – and any other tall parts on the right side of the CTRL board – are seated flush and stand