Elecraft_K-2_user_2003.pdf

+ + + + + + + E L E C R A F T A=BA/B AGC NB PRE/ATT RATE MENU ANT 1/2 213 456 798 RITXIT 0 DISPLAYBANDMODE F XFIL KEYER AF GAIN BAND - + POWER RF GAIN NB ANT2 PRE ATT ABRITXIT -1+1 S1 MSG 0 59 +20 40 T R A N S C E I V E R SPLITREV LOCK EDIT RCL STORE LEVEL TUNE PF1PF2 RF/ALC AFILCW RV REC VOX SPOT K 2 ALC RF35710 OFF ON Downloaded by? RadioAmateur.EU Elecraft P.O. Box 69 Aptos, CA 95001-0069 (831) 662-8345 Fax: (831) 662-0830 E L E C R A F T K 2 160-10 Meter S S B/CW T r a n s c e i v e r Owners Manual Revision E, February 16, 2003 Copyright 2003 Elecraft, LLC All Rights Reserved 2 ELECRAFT Table of Contents 1.INTRODUCTION.3 2.SPECIFICATIONS.5 3.PREPARATION FOR ASSEMBLY.7 4.CONTROL BOARD.13 5.FRONT PANEL BOARD.21 6.RF BOARD.32 7.FINAL ASSEMBLY.75 8.OPERATION.78 9.CIRCUIT DETAILS.1 10. OPTIONS.110 03 PARTS LIST.APPENDIX A SCHEMATIC.APPENDIX B BLOCK DIAGRAM.APPENDIX C PHOTOGRAPHS.APPENDIX D TROUBLESHOOTING.APPENDIX E PARTS PLACEMENT DRAWINGS.APPENDIX F 100-WATT STAGE AND RS232 I/O (K2/100).APPENDIX G (SUPPLIED WITH KPA100 OPTION) ELECRAFT 3 1. Introduction The Elecraft K2 is a high-performance, synthesized, CW/SSB transceiver that covers all HF bands. It is a true dual-purpose transceiver, combining the operating features youd expect in a home-station rig with the small size and weight of a rugged, go-anywhere portable. The basic K2 operates on 80-10 meter CW, and provides over 10 watts of RF output. If you prefer a full-power station, you can complete your K2 as a K2/100 at any time by adding the internal 100-watt final stage (KPA100 option). Assembly of the KPA100 is covered in Appendix G, a separate manual supplied with the KPA100 kit. You can customize your K2 by choosing from a wide range of additional options: ? SSB adapter with optimized 7-pole crystal filter ? Automatic antenna tuner (20 W internal or 150 W external) ? 160-m adapter with receive antenna switch ? 60-m adapter with low-level transverter interface ? Computer control interface (RS232) ? Noise blanker ? Low-noise audio filter and real-time clock ? Internal 2.9-Ah rechargeable battery For a complete description of available options, see page 110. In addition to the options, a companion enclosure the same size and style as the K2 is available for those who wish to build their own matching station accessories (model EC2). The K2 is an intermediate-level kit, yet youll be pleasantly surprised at how uncomplicated it is to build. All of the RF (radio-frequency) circuitry is contained on a single board, while two plug-in modules provide front panel and control functions. Wiring is minimal, unlike traditional kits which depend on complex wiring harnesses. A unique feature of the K2 is that it provides its own built-in test equipment, including a digital voltmeter, ammeter, wattmeter, complete RF probe, and frequency counter. These circuits are completed early in assembly, so theyre ready to be used when you begin construction and alignment of the RF board. We also provide complete troubleshooting and signal-tracing information. In addition to this owners manual, youll find extensive support for the K2 on our website, . Among the available materials are manual updates, application notes, photographs, and information on new products. Theres also an e-mail forum; sign-up is available from the web page. Its a great way to seek advice from the K2s designers and your fellow builders, or to tell us about your first QSO using the K2. Wed like to thank you for choosing the K2 transceiver, and hope it meets your expectations for operation both at home and in the field. Wayne Burdick, N6KR Eric Swartz, WA6HHQ Pre-Wound Toroids Available You can obtain a set of pre-wound toroids for the K2 if you prefer not to wind them yourself. Refer to our web site for details. 4 ELECRAFT Customer Service Information Technical Assistance If you have difficulty with kit construction, operation, or troubleshooting, were here to help. You may be able to save time by first consulting our web site, , or by posting your question on our e-mail forum, . Telephone assistance is available from 9 A.M. to 5 P.M. Pacific time (weekdays) at 831-662-8345. Via e-mail, use for support and to request replacement parts. Please use e-mail when possible; this gives us a written record of the details of your problem. Repair Service If necessary, you may return your completed kit to us for repair. Contact Elecraft before mailing your kit to obtain current information on repair fees. (Kits that have been soldered using acid core solder, water-soluble flux solder, or other corrosive or conductive fluxes or solvents cannot be accepted for repair.) The following information should be provided to expedite repair: your name, address, and phone number; your e-mail address (if applicable); and a complete description of the problem. Shipping: First, seal the unit in a plastic bag to protect the finish from dust and abrasion. Use a sturdy packing carton with 3 or more of foam or shredded paper on all sides. Seal the package with reinforced tape. (Neither Elecraft nor the carrier will accept liability for damage due to improper packaging.) Cover the to address label with clear tape so it will be weatherproof. Finally, call or send e-mail to obtain the proper shipping address. Elecrafts 1-Year Limited Warranty This warranty is effective as of the date of first consumer purchase. Before requesting warranty service, you should complete the assembly, carefully following all instructions in the manual. What is covered: During the first year after date of purchase, Elecraft will replace defective parts free of charge (post-paid). We will also correct any malfunction caused by defective parts and materials. You must send the unit at your expense to Elecraft, but we will pay return shipping. What is not covered: This warranty does not cover correction of assembly errors or misalignment; repair of damage caused by misuse, negligence, or builder modifications; or any performance malfunctions involving non-Elecraft accessory equipment. The use of acid-core solder, water-soluble flux solder, or any corrosive or conductive flux or solvent will void this warranty in its entirety. Also not covered is reimbursement for loss of use, inconvenience, customer assembly or alignment time, or cost of unauthorized service. Limitation of incidental or consequential damages: This warranty does not extend to non-Elecraft equipment or components used in conjunction with our products. Any such repair or replacement is the responsibility of the customer. Elecraft will not be liable for any special, indirect, incidental or consequential damages, including but not limited to any loss of business or profits. ELECRAFT 5 2. Specifications All measurements were made using a 14.0 V supply and 50-ohm load unless otherwise indicated. Values are typical; your results will be somewhat different. Specifications are subject to change without notice. (See option manuals for additional specifications.) General Size Cabinet3.0 H x 7.9 W x 8.3 D (7.5 x 20 x 21 cm) Overall3.4 H x 7.9 W x 9.9 D (8.5 x 20 x 25 cm) Weight3.3 lbs. (1.5 kg), excluding options Supply voltage9 to 15 VDC; reverse-polarity protection; internal self-resetting fuse Current drain, Receive120-150 mA in minimum-current configuration; 180-250 mA typical Transmit12.0 A typical at 10 watts; programmable current limiting Frequency controlPLL synthesizer w/single VCO covering 6.7-24 MHz in 10 bands; fine steps via DAC-tuned reference 1 Current varies with band, supply voltage, configuration, and load impedance. We recommend a minimum 3.5-amp power supply. Frequency ranges,2 MHz Basic kit3.5-4.0, 7.0-7.3, 10.0-10.2, 14.0-14.5, 18.0-18.2, 21.0-21.6, 24.8-25.0, 28.0-28.8 160 m (opt.)1.8-2.0 60 m (opt.) 5.0-5.5 VFO Stability< 100 Hz total drift typ. from cold start at 25 C Accuracy3+/- 30 Hz over a 500 kHz range (typ) when calibrated Resolution10 Hz Tuning steps10 Hz, 50 Hz, and 1000 Hz nominal (other step sizes available via menu) Memories20 (10 assigned to 160-10 m Bands; 10 general-purpose) RIT/XIT range+/- 0.6 to +/- 4.8 kHz (selectable); 10-40 Hz steps depending on range. Fine RIT mode steps 2-3 Hz typ. 2 The K2 can receive well outside the indicated bands, but this extended range is not specified or guaranteed Transmit ranges may be limited for export to some countries. The K2/100 (KPA100 option) limits transmit from 25-27.999 MHz to 10 watts or less. 3 See Frequency Calibration Techniques (page ). Downloaded by? RadioAmateur.EU 6 ELECRAFT Transmitter Power output range10 W (typ.); power setting resolution 0.1 W, accuracy 10% 5 W Min. supply voltage9.0 V min for 2 watts out recommended49.5 V min for 5 watts out 10.0 V min for 7 watts out 10.5 V min for 10 watts out Duty cycle5 W, 100%; 10 W, 50% Spurious products-40 dB or better 10 W (-50 typ) Harmonic content-45 dB or better 10 W (-55 typ) Load tolerance2:1 or better SWR recommended; will survive operation into high SWR T-R delayapprox. 10 ms-2.5 sec, adjustable External keying70 WPM max. CW sidetone400-800 Hz in 10 Hz steps Keyer Keying modesIambic A and B; adjustable weight Speed range9 - 50 WPM Message memory9 buffers of 250 bytes each; 1-level chaining; auto-repeat (0 - 255 s) 4 For reference only; not guaranteed. If higher power than shown here is to be used for a given supply voltage, monitor transmitter output signal. Receiver Preamp OnPreamp Off Sensitivity (MDS) -135 dBm -130 dBm 3rd-order intercept0 to +7.55+10 2nd-order intercept+70+70 Dynamic range, Blocking 125 dB133 dB Two-tone 9697 I.F.4.915 MHz (single conversion) Selectivity, CW7-pole variable-bandwidth crystal filter, approx. 200-2000 Hz SSB67-pole fixed-bandwidth crystal filter, 2.2 kHz typ. Audio output1 watt max. into 4-ohm load Speakerinternal: 4 ohm, 3 W; Rear-panel jack for external speaker Headphones4 - 32 ohms, stereo or mono 5 Varies with band. 6 With optional SSB adapter. Other CW and SSB fixed crystal filter options may be available Downloaded by? RadioAmateur.EU ELECRAFT 7 3. Preparation for Assembly Overview of the Kit The K2 uses modular construction, both physically and electrically. This concept extends to the chassis (Figure 3-1). Any chassis element can be removed during assembly or troubleshooting. (Also see photos in Appendix D.) If the KPA100 is installed, it takes the place of the original top cover. Top Cover Front Panel Side Panel Bottom Cover Heat Sink (Right side panel not shown) Figure 3-1 As shown in Figure 3-2, there are three printed circuit boards (PCBs) in the basic K2 kit: the Front Panel board, Control Board, and RF board. Option modules plug into the RF or Control board, but are not shown here. RF Front Panel Control Figure 3-2 8 ELECRAFT Board-to-board Connectors The circuit boards in the K2 are interconnected using board-to-board connectors, which eliminates nearly all hand wiring. Gold-plated contacts are used on these connectors for reliability and corrosion resistance. Figure 3-3 shows a side view of the PC boards and board-to-board connectors. As can be seen in the drawing, the Front Panel board has a connector J1 which mates with right-angle connector P1 on the RF board. Similarly, right-angle connector P1 on the Control Board mates with J6 on the RF board. (Not shown in this drawing are two additional right-angle connectors on the Control board, P2 and P3, which mate with J7 and J8 on the RF board.) These multi-pin connectors are very difficult to remove once soldered in place. Refer to Figure 3-3 during assembly to make sure you have each connector placed correctly before soldering. J1 P1 J6 P1 Front Panel RF Board Control Board Figure 3-3 ELECRAFT 9 There are six steps in the K2 assembly process: 1. Control Board assembly 2. Front Panel Board assembly 3. RF Board assembly and test, part I (control circuits) 4. RF Board assembly and test, part II (receiver and synthesizer) 5. RF Board assembly and test, part III (transmitter) 6. Final assembly This assembly sequence is important because later steps build on the previous ones. For example, in step 3 you