Date: Sun, 15 May 94 04:30:15 PDT From: Ham-Ant Mailing List and Newsgroup Errors-To: Ham-Ant-Errors@UCSD.Edu Reply-To: Ham-Ant@UCSD.Edu Precedence: Bulk Subject: Ham-Ant Digest V94 #143 To: Ham-Ant Ham-Ant Digest Sun, 15 May 94 Volume 94 : Issue 143 Today's Topics: GOPHER archives for rec.radio.amateur.[antenna|homebrew],QRP Loaded LPDA? looking for interdigital filters Loop Skywire Radar radar detectors Telescoping Mast Advice Sought Send Replies or notes for publication to: Send subscription requests to: Problems you can't solve otherwise to brian@ucsd.edu. Archives of past issues of the Ham-Ant Digest are available (by FTP only) from UCSD.Edu in directory "mailarchives/ham-ant". We trust that readers are intelligent enough to realize that all text herein consists of personal comments and does not represent the official policies or positions of any party. Your mileage may vary. So there. ---------------------------------------------------------------------- Date: 14 May 1994 23:54:52 GMT From: ihnp4.ucsd.edu!swrinde!gatech!concert!bigblue.oit.unc.edu!sunSITE!modena@network.ucsd.edu Subject: GOPHER archives for rec.radio.amateur.[antenna|homebrew],QRP To: ham-ant@ucsd.edu Advisory on GOPHER-accessible archives of: rec.radio.amateur.antenna rec.radio.amateur.homebrew QRP@Think.com Subject-threaded articles from the above mentioned topics can be read via GOPHER (and presumably MOSIAC and WWW). Individual articles can be retrieved via the built-in email mailer (press 'm' to pop the menu). One can assess these archives in one of two ways: 1. Via your local GOPHER client 2. Telnet to the public GOPHER server at SunSITE. At the present time, simple FTP access to these archives is not possible. 1. Use the following profile to point your local GOPHER client to the appropraite part of sunsite.unc.edu: +----------------------------------------------------------------------+ # Type=1+ Name=Electronics & Computers Path=1/../.pub/academic/agriculture/agronomy/electronics+computers Host=calypso-2.oit.unc.edu. Port=70 Admin=Jonathan Magid and Simon Spero, 919-962-9107 ModDate=Sat May 14 16:54:22 1994 <19940514165422> URL: gopher://calypso-2.oit.unc.edu.:70/11/../.pub/academic/agriculture/ agronomy/electronics+computers +----------------------------------------------------------------------+ NOTE: The URL: line was too long to send on Usenet. Join the line subsequent to the URL: line back to the URL: line before putting the profile item in your .link file. The GOPHER directory will look like this: Internet Gopher Information Client 2.0 pl11 Electronics & Computers 1. Ham Radio Callbook Server - SUNY at Buffalo ---> 2. Archives of rec.amateur.radio.ANTENNAS / 3. Archives of rec.radio.amateur.HOMEBREW / 4. Archives of QRP ... threaded from Think.com / 5. Archives of sci.ELECTRONICS / 6. . . . . other HAM RADIO related items / 7. OS2: an FAQ, the IBM Gopher and other trivia / 8. COLEM / 9. NEC / 2. TELNET to a GOPHER server (an example session) >telnet sunsite.unc.edu Trying 198.86.40.81 ... Connected to sunsite.unc.edu. Escape character is '^]'. ***************** Welcome to SunSITE.unc.edu ***************** SunSITE offers several public services via login. These include: For a simple gopher client, login as gopher ..... Internet Gopher Information Client 2.0 pl11 Root gopher server: gopher.unc.edu --> 5. Worlds of SunSITE -- by Subject/ ..... Internet Gopher Information Client 2.0 pl11 Worlds of SunSITE -- by Subject --> 3. Browse All Sunsite Archives/ ..... Internet Gopher Information Client 2.0 pl11 Browse All Sunsite Archives --> 8. academic software written by researchers in different disci.../ ..... Internet Gopher Information Client 2.0 pl11 academic software written by researchers in different disciplines --> 3. agriculture information about scientific farming, horti.../ ..... Internet Gopher Information Client 2.0 pl11 agriculture information about scientific farming, horticulture, and .../ --> 3. agronomy/ ..... Internet Gopher Information Client 2.0 pl11 agronomy --> 8. Electronics & Computers / ..... Internet Gopher Information Client 2.0 pl11 Electronics & Computers 1. Ham Radio Callbook Server - SUNY at Buffalo --> 2. Archives of rec.amateur.radio.ANTENNAS / 3. Archives of rec.radio.amateur.HOMEBREW / 4. Archives of QRP ... threaded from Think.com / 5. Archives of sci.ELECTRONICS / 6. . . . . other HAM RADIO related items / 7. OS2: an FAQ, the IBM Gopher and other trivia / 8. COLEM / 9. NEC / -- 73/Steve Modena/AB4EL MODENA@sunsite.unc.edu ham-radio gopher advisory/version 1.0.0/14 May 94 ------------------------------ Date: 14 May 94 12:56:40 GMT From: dog.ee.lbl.gov!agate!iat.holonet.net!vectorbd!jpll@ucbvax.berkeley.edu Subject: Loaded LPDA? To: ham-ant@ucsd.edu Todd Little (little@iamu.chi.dec.com) wrote: : Would it be possible to somehow load the last 2-3 elements that would be : active on 18 and 20 meters to short them to 15 meter dimensions? Has : anyone built such an antenna? I believe that the phase realtionships (that of the waves) between the loaded and unloaded elements would not be right and would not work -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -Jim Lill- Vector Board BBS jpll@vectorbd.com 716-544-1863/2645 wa2zkd@wb2psi.#wny.ny.usa.na GEnie: ZKD ------------------------------ Date: 12 May 94 22:34:50 +0930 From: ihnp4.ucsd.edu!munnari.oz.au!foxhound.dsto.gov.au!fang.dsto.gov.au!dstos3.dsto.gov.au!mwf@network.ucsd.edu Subject: looking for interdigital filters To: ham-ant@ucsd.edu hello all This is my first question to this group, I hope someone may be able to help. I am looking for a program to design interdigital filters. dos based much prefered. mwf@victor.erl.dsto.gov.au ------------------------------ Date: Thu, 12 May 94 16:15:00 EDT From: newshub.sdsu.edu!nic-nac.CSU.net!usc!howland.reston.ans.net!europa.eng.gtefsd.com!news.msfc.nasa.gov!news.larc.nasa.gov!lerc.nasa.gov!kira.cc.uakron.edu!malgudi.oar.net@ihnp4.ucsd.edu Subject: Loop Skywire To: ham-ant@ucsd.edu -----BEGIN PGP SIGNED MESSAGE----- zlau@arrl.org (Zack Lau (KH6CP)) writes: > Jim Grubs, W8GRT (jgrubs@voxbox.norden1.com) wrote: > > : > One thing to be carful of is to make it as close to a square as possible. > : > far from a square and it starts to exhibit some sharp lobes, depending on > : > exact configuration and frequency, height, etc. Actually, I think a circl > : > would be best but that's pretty hard to do for most of us. Mine was withi > : > few feet of being square. > : > : I saw a loop demo at Dayton 10 or 12 years ago that pretty well > : proved that loop shape doesn't make a darn bit of difference if > : the circumference is << lambda/2. > > True, for very small loops the shape doesn't affect the pattern, though > I can think of some shapes that could increase the losses. > > However, the loop being discussed is a full wavelength at the lowest > frequency, and multiple wavelenths at harmonic frequencies. Aren't there phase shift problems for circumferences > lambda/2 ? -----BEGIN PGP SIGNATURE----- Version: 2.3a iQCVAgUBLdKOksmzkeX3rfUNAQFQuQP8DTFXeCONg0ItzAGEOUZQxJ1XZp6Ajm4j r5bcdhoySAUolWHr+xzVyrXQtcwkrMH1f6lrRhbcAwJjnIJBINJda2qiu0Jhdvbn 1ckUErIdJupYBl+coJh1qtkMmtCV10dupz0IWFNwtJKF6hiC0LCluOzECq2qJ9Lx 3BInaC06gvI= =Rvg4 -----END PGP SIGNATURE----- /--------------------------------------------------------------------------\ | Jim Grubs, W8GRT Voxbox Enterprises Tel.: 419/885-2814 | | jgrubs@voxbox.norden1.com 6817 Maplewood Ave. Fax/Data: 419/885-2905 | | Fido: 1:234/1.0 Sylvania, Ohio 43560 Home: 419/882-2697 | | AMATEUR RADIO - The National Park of the Mind | \-+------------------------------------------------------------------------/ ------------------------------ Date: 13 May 1994 08:59:35 -0700 From: nntp.crl.com!crl.crl.com!not-for-mail@decwrl.dec.com Subject: Radar To: ham-ant@ucsd.edu Thats what I would do - Make a receiver to DETECT the local osc. of the radar unit you want to monitor. You can do the same for their radios but, its going to be better for the radar (less false detections), due to lesser amt. of units in the field. VHF/UHF radios everywhere. -- Joseph Stroup ------------------------------ Date: 14 May 1994 16:06:04 GMT From: ihnp4.ucsd.edu!agate!doc.ic.ac.uk!uknet!bnr.co.uk!corpgate!bnrgate!bmerha64.bnr.ca!news%bmerha64@network.ucsd.edu Subject: radar detectors To: ham-ant@ucsd.edu In article <2qr9bd$nkg@agate.berkeley.edu> kennish@kabuki.EECS.Berkeley.EDU (Ken A. Nishimura) writes: [snip] > Hmm, Canada, eh? They ban those puppies out there, no? Not in New Brunswick. Ontario and Quebec have passed laws prohibiting their use, though. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Fred M. Davis VA3FD | These opinions are mine and are not Northern Telecom Ltd. | necessarily those of the company Semiconductor Components Group | fmdavis@bnr.ca Nepean, ON. | va3fd@k9iu.ampr.org | freddy.davis@lambada.oit.unc.edu ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ------------------------------ Date: 13 May 1994 00:06:11 GMT From: parc!biosci!agate!howland.reston.ans.net!europa.eng.gtefsd.com!newsxfer.itd.umich.edu!csd475b!newsserv!majewski@decwrl.dec.com Subject: Telescoping Mast Advice Sought To: ham-ant@ucsd.edu Hello to all! I am thinking about buying a Rohn H-50 telescoping mast for use on Field Day. Does anyone have first or second-hand experience with this unit? Did you think it was well made? Do you have any hints/kinks to offer? Assuming light antenna loading, can you get away with guying every other section rather than every section? (I know this month's QST article recommends the latter) Are rope guys enough for FD? I'd appreciate any and all information you can share. Thanks and 73! Ron (wb8ruq). majewski@erim.org -- Ron Majewski (majewski@erim.org) The Environmental Research Institute of Michigan ------------------------------ Date: 14 May 94 14:26:53 GMT From: dog.ee.lbl.gov!agate!iat.holonet.net!vectorbd!jpll@ucbvax.berkeley.edu To: ham-ant@ucsd.edu References <2pceka$k74@portal.gmu.edu>, <2pfp6r$475@search01.news.aol.com>, Subject : Re: portable antenna for NVIS? Grover Cleveland (cleveland@gvg47.gvg.tek.com) wrote: : >In article <2pceka$k74@portal.gmu.edu>, drickers@mason1.gmu.edu (Donald E : >Rickerson) writes: : > : >>I am looking for aportable antenna to use with a Near Vertical Incident : >>Skywave antenna that works with a adaptive HF radio, ALE. It has to be : >>a broadband antenna that can be erected by semi-skilled operators. try a B&W broadband Dipole in an inverted vee mode. Metal support is alleged to be taboo but works OK. The B&W is okay in eff down to 4 or so Mc then gets lossy. Still usable however. -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -Jim Lill- Vector Board BBS jpll@vectorbd.com 716-544-1863/2645 wa2zkd@wb2psi.#wny.ny.usa.na GEnie: ZKD ------------------------------ End of Ham-Ant Digest V94 #143 ******************************