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QEX Jan Feb 2012 Cover.Indd 1 Cover.Indd 2012 Feb Jan QEX 11/16/2011 9:34:11 AM 9:34:11 11/16/2011 QEX Jan Feb 2012 Cover.indd 1 Cover.indd 2012 Feb Jan QEX 11/16/2011 9:34:11 AM 9:34:11 11/16/2011 The national association for ARRL AMATEUR RADIOTM 225 Main Street Newington, CT USA 06111-1494 5 $ • The perfect internet base transceiver - straight out of the box! • Easy to operate. • The size makes it great for base, mobile or portable operation. • Free VoIP/Control software downloads at Kenwoodusa.com. • Incredible RX specifications. • No expensive sound card interface needed. Customer Support: (310) 639-4200 Fax: (310) 537-8235 ADS#65311 Scan with your phone to download TS-480HX brochure. January/February 2012 About the Cover Fred Brown, W6HPH, eliminates most man-made QEX (ISSN: 0886-8093) is published bimonthly in January, March, May, July, September, and noise from his receiver with the NC (Noise Canceller). November by the American Radio Relay League, With his four-transistor circuit you can shift the phase 225 Main Street, Newington, CT 06111-1494. of the signals coming from a separate noise antenna, Periodicals postage paid at Hartford, CT and at and vary the amplitude of those signals to cancel the additional mailing offices. noise coming from the main receive antenna. One of POSTMASTER: Send address changes to: QEX, 225 Main St, Newington, CT 06111-1494 the transistors serves as a phase splitter, allowing Issue No 270 you to switch between 0° and 180° for the base phase Harold Kramer, WJ1B shift. A dual-gate MOSFET serves as a variable-gain Publisher amplifier. (K9QZI Photo) Larry Wolfgang, WR1B Editor In This Issue Lori Weinberg, KB1EIB Assistant Editor Zack Lau, W1VT Ray Mack, W5IFS Features Contributing Editors Production Department Steve Ford, WB8IMY Some Homemade Capacitors Publications Manager Michelle Bloom, WB1ENT Luiz Amaral, PY1LL/AC2BR Production Supervisor Sue Fagan, KB1OKW Graphic Design Supervisor Q Factor Measurements on L-C Circuits David Pingree, N1NAS Jacques Audet, VE2AZX Senior Technical Illustrator Carol Michaud, KB1QAW Technical Illustrator Advertising Information Contact: End Man-Made Noise with the Noise Canceller Janet L. Rocco, W1JLR Fred Brown, W6HPH Business Services 860-594-0203 – Direct 800-243-7768 – ARRL 860-594-4285 – Fax Pic’n on the ThunderBolt Circulation Department John Maetta, N6VMO Cathy Stepina, QEX Circulation Offices 225 Main St, Newington, CT 06111-1494 USA Telephone: 860-594-0200 Tech Notess Fax: 860-594-0259 (24 hour direct line) Doyle Strandlund, W9NJD e-mail: [email protected] Subscription rate for 6 issues: In the US: ARRL Member $24, nonmember $36; SDR: Simplified US by First Class Mail: ARRL member $37, nonmember $49; Ray Mack, W5IFS International and Canada by Airmail: ARRL member $31, nonmember $43; Members are asked to include their membership control number or a label from their QST when Out of the Box applying. Ray Mack, W5IFS In order to ensure prompt delivery, we ask that you periodically check the address information on your mailing label. If you find any inaccura- Upcoming Conferences cies, please contact the Circulation Department immediately. Thank you for your assistance. Copyright © 2011 by the American Radio Relay League Inc. For permission 2011QEX Index to quote or reprint material from QEX or any ARRL publication, send a written request including the issue date (or book title), article, page numbers and a Index of Advertisers description of where you intend to use the reprinted material. Send the request American Radio Relay League: .................... 6, National RF, Inc: ............................................6 to the office of the Publications Manager Cover III, Cover IV Nemal Electronics International, Inc: ...........23 ([email protected]). Array Solutions: ...........................................24 RF Parts:................................................21, 23 Down East Microwave Inc: ...........................23 Tucson Amateur Packet Radio: ...................24 Kenwood Communications: .................Cover II QEX – January/February 2012 1 The American Radio Larry Wolfgang, WR1B Relay League The American Radio Relay League, Inc, is a noncommercial association of radio amateurs, organized for the Empirical Outlook promotion of interest in Amateur Radio communication and experimentation, for the establishment of networks to provide communications in the event of disasters or other emergencies, for the advancement of the radio art and of the public welfare, for the Looking Back and Looking Forward representation of the radio amateur in legislative matters, and for the maintenance of fraternalism and The beginning of a new year always leads to thoughts about where we have been and a high standard of conduct. where we are going. Many of us think about New Year’s Resolutions, and wonder how ARRL is an incorporated association without long we will be able stick with the new plans. On a personal note, I was pleased to move capital stock chartered under the laws of the state beyond the medical issues that had me out of service for the second half of 2010. A full of Connecticut, and is an exempt organization under Section 501(c)(3) of the Internal Revenue return to health in 2011 has made it a good year! I look forward to an active 2012, and Code of 1986. Its affairs are governed by a Board blending Amateur Radio into many of the outdoor activities I enjoy. I recently participated of Directors, whose voting members are elected every three years by the general membership. The in some hidden transmitter hunting, and a bit of walking to get different angles on the officers are elected or appointed by the Directors. “fox” while tracking it down was good exercise. I am also resolving to make at least one The League is noncommercial, and no one who could gain financially from the shaping of its HF QSO each week. That may not seem like much effort, and many weeks I expect to affairs is eligible for membership on its Board. make more than one QSO. Since I have sometimes gone a month or more without turn- “Of, by, and for the radio amateur,” ARRL ing on my radio, this will be a reasonable goal. numbers within its ranks the vast majority of active amateurs in the nation and has a proud history of As always, we had some excellent articles in QEX during 2011, and we can look for- achievement as the standard-bearer in amateur ward to more of the same in 2012. For several months it seemed that our stock of articles affairs. to publish was very thin, and we struggled to reach our goal of a 48 page issue several A bona fide interest in Amateur Radio is the only times. In fact, this issue is one of the thinner issues we have published in a long time. For essential qualification of membership; an Amateur Radio license is not a prerequisite, although full the immediate future we seem to have turned that corner, and have several multipart voting membership is granted only to licensed articles lined up for 2012. amateurs in the US. If you have been thinking about writing an article for QEX, I would ask you to move Membership inquiries and general corres- pondence should be addressed to the that to the top of your Resolutions list. We can definitely churn through a lot of material administrative headquarters: for every issue, so we do need a steady stream of good articles. I’ve written about sub- mitting articles in the past, and continue to encourage our readers to write about a proj- ARRL 225 Main Street ect you have built, an explanation of some technical issue that interests you or just about Newington, CT 06111 USA anything related to Amateur Radio technology. I always mention our need for a “plain” Telephone: 860-594-0200 FAX: 860-594-0259 (24-hour direct line) manuscript file with just text, and for separate high resolution photo and graphics files. One article that I had planned to use in this issue turned out to be unusable because the Officers author had only submitted low-resolution images embedded into a Word file, and was President: KAY C. CRAIGIE, N3KN then unable to send separate photos. Since we didn’t have printable photos, we were 570 Brush Mountain Rd, Blacksburg, VA 24060 forced to hold the article and hope the author can supply good photos later. Chief Executive Officer: DAVID SUMNER, K1ZZ What projects have you started or completed in the past year? I hope when you take The purpose of QEX is to: stock, 2011 will have been a good year for your hobby interests. One holdover for me from a couple of years ago has been to try building a few more projects using surface 1) provide a medium for the exchange of ideas and information among Amateur Radio experimenters, mount components. I recently acquired a high definition Web camera for my computer. The immediate goal was better picture quality when we Skype with our son, daughter- 2) document advanced technical work in the Amateur Radio field, and in-law and granddaughters in Wyoming. The ulterior motive was to have a better way to magnify an image of the circuit board as I try to place those SMD parts on the solder 3) support efforts to advance the state of the paste prior to heating the board to melt that paste. For about $40 on sale, I am hoping Amateur Radio art. this camera will be a very inexpensive “microscope” for my workbench. I’ll let you know All correspondence concerning QEX should be how that goes. addressed to the American Radio Relay League, 225 Main Street, Newington, CT 06111 USA. There is some exciting news to share about QEX on the International front. ARRL has Envelopes containing manuscripts and letters for publication in QEX should be marked Editor, QEX. recently partnered with Practical Electronics, a Chinese hobby electronics and Amateur Radio magazine, to bring some of the technical articles from QEX to their readers.
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