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The FARS RelayOctober Meeting Wednesday October 25Bill Rausch, AA6PA has agreed to speak at the next FARS Meeting. He will be talking about CANSATS and CUBESATS, an educational outreach program led by Prof. Bob Twiggs of Stanford, and (It is hoped) will include some exciting DVD footage of the CANSAT rocket launches in the Black Rock Desert, Nevada.Presidents CornerAt the next meeting we will be presenting the slate of officers for the 2001 year. You will be given the chance to nominate from the floor if you do so we ask that you have the persons permission to submit their name.We are moving our meetings to the fourth Wednesday in the hope of attracting more young people so mark your calendars accordingly. It is time to renew your membership for next year and to get your money in for the banquet in January. Between now and Dec. 31 we must take down our station and we will need a lot of help from you the membership. We are in the process of trying to find a new home for the station but do not have a location at this time. We will need help in storing equipment and if you can help please sign up at the meeting or let me or Omri know by e-mail. We really need everyone's participation at our meetings. Another reminder: We are now having the speaker first on the agenda and the business will be last. de Jack WA6YJR
October Board Meeting MinutesThe FARS board held its monthly meeting on the evening of October 3, 2000. Present were Jack, WA6YJR, David, KD6WRG, Omri, AA6TA, Dirk, KE6ZUY, Dick, N6ATD, Herb, KF6BKL, Steve, K6OIK, Shel, N6RD, and Martin, KD6WJW. A nominee for training officer still needs to be added to the slate of candidates for club offices next year. There was considerable discussion concerning dismantling and storing the club station as well as potential new locations for it.- Martin, KD6WJW
CalendarFARS Winter banquet January 19, 2001 at Michael'sLivermore Swap Meet - 1st Sunday of each month at Las Positas College in Livermore, 7:00 AM to noon, all year. Talk in 147.045 from the west, 145.35 from the east. Contact Noel Anklam, KC6QZK, (510) 447-3857 eves. Foothill Flea Market - 2nd Saturday of each month from March to October at Foothill College, Los Altos Hills. FARS NET on 145.23 repeater Thursday nights at 8 PM.
September MeetingThis was our Home Brew Night. Floyd K6BSU took first prize with a crystal set and a capacitive touch keyer. Norm W6IQX, with a lamp made from computer boards and lettering made from CDs tied for second prize with Charlie KF6CUU who had a microwave termite killer. Bill KQ6FY took fourth prize with a windmill battery charger. We had a very good turnout for the meeting, Perhaps indicating seeing is believing.
CalendarFARS Winter banquet January 19, 2001 at Michael'sLivermore Swap Meet - 1st Sunday of each month at Las Positas College in Livermore, 7:00 AM to noon, all year. Talk in 147.045 from the west, 145.35 from the east. Contact Noel Anklam, KC6QZK, (510) 447-3857 eves. Foothill Flea Market - 2nd Saturday of each month from March to October at Foothill College, Los Altos Hills. FARS NET on 145.23 repeater Thursday nights at 8 PM.
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CLUB INFORMATIONVice President: Howard Califf, KE6PWH Treasurer: Shel Edelman, N6RD Secretary: Martin Liberman, KD6WJW Training Officer: Steve Stearns, K6OIK Radio Officer: Omri Serlin, AA6TA Newsletter: David Wilkes, KD6WRG (See address below) Board members: Dirk Thiele KE6ZUY, Dick Baldwinson N6ATD, Herb Davidson KF6BKL, Larry Moore KM6IU, Charles Arney KF6CUU. K6YA Station Trustee: Stan Kuhl, K6MA FARS Web Page: www.fars.k6ya.org FARS announcement mailing list is moderated, so you cannot reply directly to the list. fars-announce@svpal.orgAlso, note you can contact the FARS board of directors at fars-board@svpal.orgTo subscribe/unsubscribe, send a message to: majordomo@svpal.orgIn the e-mail message (in plain text) put one of: unsubscribe fars-announce YOUR-EMAIL-ADDRESS(eg. Subscribe fars-announce dwilkes@svpal.org) The FARS Relay is the official monthly newsletter of the Foothills Amateur
Radio Society Meetings are held at 7 PM on the fourth Friday of each month
except January (Winter Banquet); and 3rd Friday in June, Nov. & Dec.
Annual membership $20; family $25. Visitors are always welcome! Directions
on the back page. Talk-in: N6NFI (145.23-, 100Hz) or W6ASH repeater (145.27
or 224.36). Contributions to the newsletter from members, family, and guests
are earnestly solicited! Contributions subject to editing and/or compression.
ASCII files via packet, Internet or diskettes preferred; but all readable
forms welcome. Here is how to reach the editor:
VHF voice: KD6WRG on N6NFI, 145.23- (100Hz PL) FARS net Thursdays 8
PM; Various other times. Mail: 1093 Kelly Drive San Jose CA 95129-3222
Voice: 408-996-1613 (Until 9 PM); Fax: 408-725-1036, and at FARS meetings.
Station Take-downTo: All FARS members:As you may know, we have to evacuate the club station by the end of December. So, we will need to store away the station's equipment until a new site is found. We are looking for volunteers to provide storage for the following bulkiest items: 1. Force 12 7-element yagi; can be disassembled to 6 ft.
PLEASE LET ME KNOW IF: - you can store one or more of these items; especially items 1-9.
73 de Omri AA6TA
Radio Officer aa6ta@arrl.net Amateur Radio Newsline(San Francisco ITVA) *
Promotion of Ham Radio: Amateur Radio Awareness Day September 16 Amateur
Radio Awareness Day is September 16th and ARRL Media Relations Manager
Jennifer Hagy, N1DTY says that this is an excellent opportunity to promote
Amateur Radio in your community. A sample letter to the editor and a fill-in-the-blanks
press release are now available on the Leagues Public Relations Department
Web site at:
www.arrl.org/pio
Jennifer says that it's a great place to get data on how to promote the
hobby.
If you are not on the web you can call Jennifer at League headquarters and she will be happy to fax you a copy of the Awareness Day press materials. You can reach N1DTY weekdays normal business hours Eastern Time at (860) 594-0328. Her e-mail address is: jhagy@arrl.org (ARRL) *
THE BAN WILL CONTINUE: NO RADIOS ON PASSENGER JETS IN THE USA If you have any thoughts of using your two meter hand held or a cellular phone the next time you fly on a commercial airliner in the United States -- forget it. This as the decade old ban on the use of these devices and others will continue. Newsline's David Black, KB4KCH, has more: "The decision lets airlines continue restricting in-flight use of electronic devices. It comes after telecommunications experts told Congress that--while there is no definitive proof that cellular phones pose safety risks on airplanes--the devices should stay banned as a precautionary measure. The Federal Aviation Administration's Thomas McSweeny, testified that restricting the use of these devices prevents an extremely remote chance of a disaster from taking place. McSweeny's testimony took place before the House of Representatives Transportation Subcommittee. The hearing was held because lawmakers say the public is confused about airline rules governing use of devices including laptop computers, hand-held games, pagers, 2-way radios and cellular phones. Tennessee Representative John Duncan says the ban against cellular phones in the air is one of the biggest causes of altercations between passengers and crew on board airplanes. McSweeny says the FAA remains concerned that radiation from electronic devices could cause errors in the aircraft instrument landing systems or global positioning readings. McSweeney notes that many hospitals prohibit using cellular phones and other transmitters because they can interfere with health monitoring devices. But other witnesses testified that while there have been incidents in which portable electronic devices may have interfered with aircraft operations, they have never been able to repeat such episodes under controlled conditions. The FCC's Engineering and Technology Chief, Dale Hatfield, W0IFO, also testified. Hatfield says Commission rules also prohibit cellular transmissions aboard in-flight aircraft. That, he says, is because calls made from high altitudes keep phones on the ground from being able to use the same cellular telephone base station frequencies. Representative James McGovern urged the FAA to promote technology which detects emissions from inside an aircraft cabin that could produce electromagnetic interference. That kind of technology, McGovern says, could lead to greater in-flight safety. Meanwhile, the in-flight ban on the use of electronic devices -- including your 2 meter H-T and all other ham radio gear -- remains in place. From Birmingham Alabama, I'm David Black, KB4KCH, reporting for Newsline."The aviation industry now differentiates between intentional and unintentional transmitting devices. Devices such as cellular telephones, hand held two-way radios, two or more inter-connected electronic games or hand-held computers that receive e-mail are considered to be intentional R-F emitters and are totally banned in-flight at all times. Scanner radios and ham radio transceivers fall into this category. On the other hand, most airlines permit unintentional R-F emitters such as laptop computers or CD players to be used after a plane crosses through 10,000 feet. Most other electronics, though, including all ham gear, remains banned (Newsline from published news reports)
SCIENCE AND TECHNOLOGY: UNDERSTANDING RF The FCC has released a new and
easy to understand guidebook on radio frequency emissions. The objective
of this publication is to assist local governments, businesses, homeowner
groups and individual citizens in better understanding the origin and application
of the agency's safety rules. The guide is titled `A Local Government's
Official Guide to R-F Emission Antenna Safety.' It's well written and contains
rules, procedures and other information. More information is on the web
at www.fcc.gov/oet/rfsafety.
(FCC)
Our web page is at:
www.arnewsline.org
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Multiband Matching Network Design using ARDThe GM3HAT dipole of delight is a multiband dipole antenna that is resonant on 40, 20, 15, and 10 meters but not 80 meters. The VSWR is below 1.62 on these bands; while on 80 meters, it exceeds 11:1.[Cf. Ham Radio magazine, pp. 69-78, May 1987 and U.S. Patent No. 4,518,968.] I decided to see if I could design a matching network that would match 80 meters while not destroying the matches on the other four bands. The solution turned out to be remarkably easy. First, determine an L network that gives the desired match on 80 meters. Second, add bypass stubs: Put a quarter wave open-circuit stub in series with the shunt arm of the L, and put a quarter wave short-circuit stub in parallel with the series arm of the L. The L operates normally on 80 meters, but the stubs bypass the L on the harmonic bands. I programmed the circuit in ARRL Radio Designer, and, as predicted, it worked great. As a final step, I ran the optimizer on all of the network parameters. I was particularly interested in whether the optimizer could reduce the 1.62 VSWR. The optimizer ran at blazing speed on my 500 MHz PC - over 64,000 iterations in minutes. The peak VSWR was reduced to 1.46:1 on 40 meters. The final network is beautifully simple - just four components. If any one needs a multiband antenna, they might look seriously at the four-band GM3HA dipole of delight and give it a fifth band with an inexpensive fixed network - no expensive antenna tuner required! - Steve, K6OIK
Maxwell's equations?Nowadays, the four vector equations of electromagnetic theory are almost universally called "Maxwell's" equations. This name for the equations, although popular, is a regrettable error of history. The four vector equations (curl E= -dB/dt, curl H = J + dD/dt, div D = q, div B = 0) were formulated by Oliver Heaviside in the 1880's and published around 1883-84. Maxwell died in 1879 before these equations had been worked out. At the time of his death, Maxwellian theory consisted of some twenty equations in twenty unknowns in both scalar and quaternionic variables. Although Maxwell's theory was a field theory, the electric and magnetic fields lacked central importance in his mathematical expression. Vectors and vector analysis did not yet exist. Therefore, the four vector equations of modern electromagnetics properly ought to be called "Heaviside's equations for Maxwell's theory." A good account of this historical matter is found in Prof. Paul J. Nahin's book: "Oliver Heaviside: Sage in Solitude," IEEE Press, 1988.- Steve, K6OIK
Wireless Business NewsVenues for tracking wireless business news and advertising wireless products include the following:Wireless business news sites (with vendor lists): RF Globalnet, www.rfglobalnet.com
Trade magazines (most have vendor lists on their web sites too):
Professional society publications:
If I missed your favorites, let me know and I'll add them to the list. - Steve
steve.stearns@trw.com stearns@ieee.org k6oik@arrl.net |
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