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Summary of Contents for ELECRAFT W2
- Page 1 LECRAFT W2 W ATTMETER ’ WNER ANUAL Revision D, February 10, 2012 Copyright © 2012, Elecraft, Inc. All Rights Reserved...
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Page 2: Table Of Contents
Appendix B – Schematic Diagrams ......................20 Appendix C – Power On Modification ....................26 Important Operating Notes for Modified Units ....................26 Installing the Jumper ............................26 Elecraft manuals with color images may be downloaded from www.elecraft.com. -
Page 3: Introduction
Introduction The Elecraft W2 is a versatile, auto-ranging RF power and SWR meter that utilizes remote sensing. Up to two remote sensors can be attached, with various power and frequency ranges available (see Sensors, page 19). Sensors use standard CAT5 shielded or unshielded cables. -
Page 4: Specifications
Elecraft at the time of original order, are not covered by this warranty. If the Elecraft product is being bought indirectly for a third party, the third party's name and address must be provided to Elecraft at time of order to insure warranty coverage. -
Page 5: Operation
Operation Typically the W2 is inserted between the transmitter and an antenna tuner, if one is used. The W2 then displays the SWR presented to the transmitter. If the W2 is inserted between the antenna tuner and antenna, it will show the antenna's unmatched SWR. -
Page 6: Rear Panel
REAR PANEL CONNECTOR NOTES: 1. A power cable is provided with your W2 with a mating connector for the W2 at one end and tinned leads for connecting to a power supply at the other end. An RCA plug is also supplied that you may connect to use the 12VDC accessory output on the back panel of the K3. -
Page 7: Directional Coupler (Sensor)
Elecraft and installed using the optional PC interface and the W2 Utility program. Updated program files may be obtained in two ways. You can check the box in the W2 Utility that says “Copy new files from Elecraft into local folder”. This will download the latest production released firmware. Optionally, you can download the new file from the Elecraft web site manually and place it in a local folder, then browse for it within the W2 utility. -
Page 8: Swr Alarm Function
If you choose to use a soldering iron to work on your W2 for any reason, be sure your iron has an ESD- safe grounded tip tied to the same common ground used by your mat or wrist strap. -
Page 9: Tools Required
Before starting construction, do a complete inventory, comparing the parts in your kit with the parts list in Appendix A, to familiarize yourself with all of the parts and to ensure the kit is complete.. If any parts are missing contact Elecraft for a replacement (see Customer Service and Support, page 3). Display Unit Assembly Mount two standoffs and two 2D fasteners on the bottom of the main board as shown in Figure 1. - Page 10 Figure 3. If necessary install a 2-56 5/32” (4.0 mm) nylon screw at each location. These screws are inserted until the heads just touch the PC board. They don’t hold anything. When the W2 is fully assembled, the heads of these screws serve as “bumpers”...
- Page 11 Mate plug P1 on the bottom of the main board with jack J1 on the front panel board as shown in Figure 5. Note that one pin on P1 has been removed and a plug is placed in the corresponding hole in J1. This is to help avoid misaligning the connectors.
- Page 12 Remove the screw holding the spacer between U3 and the pc board and mount the bottom cover as shown in Figure 7. Be careful not to dislodge the spacer. If it falls out, you must remove the cover and replace it as shown in Figure 2.
- Page 13 Install a 1/4” (6.4 mm) black pan head screw into the mounting hole for the PTT RY connector as shown in Figure 10. Do not tighten this screw! It only threads into plastic. Stop turning when the head reaches the back panel.
- Page 14 Mount 2D fasteners with 3/16” (4.0 mm) black pan head screws at each end of the rear panel cover as shown in Figure 10 (A). Install one fastener at each end of the panel. Do not use lock washers. Mount 2D fasteners with 3/16” (4.0 mm) black flat head screws at each end of the front panel cover as shown in Figure 10 (B).
- Page 15 Mount both side panels on the W2 display unit using three 3/16” (4.0 mm) black flat head screws in each panel. Do not use lock washers. Start all the screws in each side panel before tightening them to make fitting the panels easier.
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Page 16: Directional Coupler
Directional Coupler The directional coupler sensor used to provide RF Power and SWR a measurement is furnished completely assembled and tested to ensure the greatest measurement accuracy. We recommend you do not open the unit. The interior of a typical directional coupler is shown in Figure 13. Figure 13. -
Page 17: Appendix A Parts List
Appendix A Parts List W2 Circuit Boards ELECRAFT ILLUSTRATION DESCRIPTION QTY. PART NO. W2 Main PCB Assembly E850353 W2 Front Panel (FP) PCB Assembly E850354 Enclosure ELECRAFT ILLUSTRATION DESCRIPTION QTY. PART NO. Front Panel E100340 Bottom Cover E100342 Right Side Panel... -
Page 18: W2 Hardware (E850356)
W2 Hardware (E850356) ELECRAFT ILLUSTRATION DESCRIPTION QTY. PART NO. 2-D Fastener E100078 4-40, Lock washer, #4, Split Z E700004 4-40, Screw, 1/4” (6.4 mm), Black, Pan Head E700009 Black Pan Head 4-40, Screw, 3/16” (4.0 mm), Black, Pan Head E700015 (Typical) 4-40, Screw, 1/2”... -
Page 19: Cables
Cables These cables are provided with both the factory-assembled and kit versions of the W2. ELECRAFT ILLUSTRATION DESCRIPTION QTY. PART NO. Power Cable (An RCA connector is included for use with rigs such as E850361 the K3 that have a female RCA... -
Page 20: Appendix B - Schematic Diagrams
Appendix B – Schematic Diagrams... - Page 25 SERIAL INTERFACE CABLE...
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Page 26: Appendix C - Power On Modification
Observe ESD precautions when working inside your W2. Wear an ESD wrist strap or touch an unpainted, metal ground frequently while working. Use an ESD-safe soldering iron. Remove the W2 top cover. It is held in place by two flat head screws on top and two pan head screws on the back.
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