Date: Sun, 10 Apr 94 04:30:09 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 #98 To: Ham-Ant Ham-Ant Digest Sun, 10 Apr 94 Volume 94 : Issue 98 Today's Topics: 10M 5/8 wave antenna Antenna materials... (2 msgs) Coax Loss on HF Egg beater? Help for low cost antenna HF antenna help HF in an apartment Isoloop Experiences? Ladder Line (3 msgs) Low cost antenna for Tv low cost antenna required Rugged Repeater Antennas, Advice Needed Temporary HF Mobile ant? 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: Sat, 9 Apr 1994 22:32:52 GMT From: news.Hawaii.Edu!uhunix3.uhcc.Hawaii.Edu!jherman@ames.arpa Subject: 10M 5/8 wave antenna To: ham-ant@ucsd.edu I'm constructing a 10M beacon for Hawaii. I believe the ideal antenna would be a 5/8 wave vertical since it has a lower angle of radiation which provides it a bit of gain over a dipole. Questions: - Should the radiating element be exactly 5/8 the transmitting wavelength? - This antenna does not terminate in 50 ohms; what's the `ideal' matching inductor/capacitor design at the base? (airwound? wire size? # of turns? diameter?) [Oh, the xmtr has an output of about 10W] - Has QST done an article on a 5/8 wave for 10M? Thanks so much for your help. Jeff NH6IL P.S. Here's a list of 10M beacons (not too up-to-date, though). I pulled this off of the email server at ham-server@grafex.sbay.org *************************************************************************** From: ham-server@GRAFex.sbay.org Subject: File K:/hamradio/10mbeaco.lst The following 10 meter beacon list has been compiled and maintained by Joe Gumino (K2OLG). If you have any corrections, additions or deletions please direct them to me (WA2ZYU @ KB1BD-4) and I will forward them to Joe. Thank you for your interest and response to this list in the past. Joe and I shall work to keep it current.......agn tnx & 73. 10 METER BEACON'S de K2OLG 2/19/90 Part 1 Edited and distributed under OKIPN by N8GTC FREQ. CALL OPERATION LOCATION NOTES 28.175 VE3TEN C OTTAWA, CANADA 10W, GP 28.191 VE6YF EDMONTON, ALBERTA 10W 28.195 IY4M ROBOT BOLOGNA, ITALY 20W, 5/8 GP 28.200 GB3SX C CROWBOROUGH, ENGLAND 8W, DIPOLE 28.201 LU8ED ARGENTINA 5W 28.202 KE5GY ARLINGTON, TX 5W, VERTICAL 28.2025 ZS5VHF NATAL, RSA 5W, GP 28.204 DL0IGI C W. GERMANY 100W, VERT. DIPOLE 28.205 KA3OEM MEADVILLE, PA. 27W, YAGI/WEST 28.206 KJ4X PICKENS, SC 2W, VERTICAL 28.2075 W8FKL C VENICE, FLA 10W, VERT. 28.208 WA1IOB C MARLBORO, MASS 75W, VERT. 28.209 NX2O C STATEN ISLAND, NY 10W, GP 28.210 3B8MS C MAURITIUS GP 28.210 K4KMZ I ELIZABETHTOWN, KY. 20W, VERT. 28.210 KC4DPC C WILMINGTON,NC 4W, DIPOLE 28.212 EA6RCM PALMA DE MALLORCA 4W, 5 EL NNE 28.2125 ZD9GI C GOUGH IS. GP 28.215 GB3RAL C SLOUGH, BERKSHIRE 20W, GP 28.2175 W8UR MACKINAW ISLAND,MI .5W, GP 28.2175 WB9VMY C CALUMET, OK. 2W, DIPOLE 28.2195 LU4XS CAPE HORN 28.220 5B4CY C CYPRUS 26W, GP 28.221 PY2GOB SAN PAULO, BRAZIL 15W, VERT. 28.222 W9UXO C NR CHICAGO, ILL. 10W, GP 28.2225 HG2BHA C TAPOLCA, HUNGARY 10W, GP *28.225 PY2AMI C SAO PAULO, BRAZIL 5W, DIPOLE 28.2275 EA6AU C MALLORCA, BALEARIC IS. 10W, 5/8 GP 28.230 ZL2MHF C MT. CLIMIE, NZ. 50W, VERT. DIPOLE 28.232 W7JPI/AZ C SONOITA, ARIZ. 5W, 3 EL YAGI NE 28.233 KD4EC C JUPITER, FLA. 7W, GP 28.235 VP9BA C HAMILTON, BERMUDA 10W, GP 28.2375 LA5TEN C OSLO, NORWAY 10W, 5/8 GP 28.2405 5Z4ERR C KIAMBU, KENYA 28.245 A92C BAHRAIN NW/SE DIPOLE 28.2455 ZS1CTB C CAPETOWN, RSA 20W, 1/4 VERT. 28.247 EA3JA BARCELONA, SPAIN 28.2475 EA2HB I SPAIN 6W, GP 28.248 K1BZ C BELAST, MAINE 5W, VERT. DIPOLE 28.250 W3SV C ELVERSON, PA 10W, VERT. 28.250 K0HTF C DES MOINES, IA 2W, GP 28.250 Z21ANB C BULAWAYO, ZIMBABWE 15W, GP 28.2505 4N3ZHK C MT. KUM, YUGOSLAVIA 1W, VERT. 28.252 WJ7X C SEATTLE, WA 5W, RINGO 28.252 WB4JHS I FLORISSANT, MO. 7W, VERT. 28.2525 OH2TEN FINLAND 28.255 LU1UG GRAL PICO, ARGENTINA 5W, GP 28.2575 DK0TEN C ARBEITSGEN, W. GERMANY 40W, GP 28.259 WB9FVR C PEMBROKE PINES, FLA. 1W, DIPOLE 28.260 VK5WI C ADELAIDE, SA, AUSTRALIA 10W, GP 28.262 VK2RSY C SYDNEY, NSW, AUSTRALIA 25W, GP 28.264 VK6RWA C PERTH, WA, AUSTRALIA 28.266 VK6RTW C ALBANY, WA, AUSTRALIA 28.266 KB4UPI C BIRMINGTON, ALA 20W, 1/4 VERT. 28.2685 W9KFO I EATON, ILL 750MW, VERT. 28.270 ZS6PW C PRETORIA, RSA 10W, 3 EL YAGI 28.270 VK4RTL C TOWNSVILLE, QLD, AUSTRALIA 28.2725 9L1FTN I FREETOWN, SIERRA LEONE 10W, VERT. DIPOLE *28.2745 ZS1LA STILLBAY, RSA 20W, 3 EL YAGI NW 28.275 AL7GQ C DENVER, CO 1W, LOOP 28.2755 N6RDX I STOCKTON, CA 20W, 3 EL YAGI 28.2775 DF0AAB C KIEL, W. GERMANY 10W, GP 28.280 LU8EB ARGENTINA 5W 28.282 VE1MUF C FREDRICKTON, NB, CANADA 500MW, DIPOLE 28.282 VE2HOT C BEACONSFIELD, QUE 5W, VERT DIPOLE 28.2825 OK0EG C HRADEC KRALOVE 10W, DIPOLE 28.284 VP8ADE C ADELAIDE IS, NR ANTARCTICA 8W, V BEAM TO G LAND *28.286 KE2DI NR ROCHESTER, NY 2W, VERT. DIPOLE 28.286 KK4M C LAS VEGAS, NEV. 5W, VERT. 28.287 W8OMV NR ASHVILLE, NC. 5W, GP 28.287 H44SI C SOLOMON IS. 15W 28.288 W2NZH I MOORESTOWN, NJ 3W, GP 28.290 SK5TEN SWEDEN 28.290 VS6TEN C HONG KONG 10W, VERT. 28.292 ZD8HF ASCENSION ISLAND 28.2925 LU2FFV SAN JORGE, ARGENTINA 5W, GP 28.295 WC8E I CINCINNATI, OHIO 10W, RINGO 28.296 W3VD C LAUREL, MARYLAND 1.5W, VERT. DIPOLE 28.297 WA4DJS I FT. LAUDERDALE, FLA 30W, GP 28.301 KF4MS C ST. PETERSBURG, FLA 5W 28.3025 PT7AAC FORTALEZA, BRAZIL 5W, GP 28.306 PT8AA RIO BRANCO, BRAZIL 5W, GP 28.315 ZS6DN C IRENE, RSA 100W, VERT. 28.888 W6IRT HOLLYWOOD, CA 5W, GP CODE PRACTICE 28.992 DF0ANN MOTITZBERG, W. GERMANY 20MW, 1 EL DELTA LOG * REVISION ------------- cut here ----------------- -- This is the last part --------------- --- End of session. A new INDEX is placed on-line weekly. Files are constantly being added. We are constantly on the lookout for new amateur radio related material. If you have something you would like to share, contact me. 73 de KA6ETB@grafex.sbay.org . . . . . . . . . . . . . KA6ETB @ N0ARY.CA ------------------------------ Date: 9 Apr 94 18:51:37 GMT From: sdd.hp.com!hpscit.sc.hp.com!icon!greg@hplabs.hp.com Subject: Antenna materials... To: ham-ant@ucsd.edu Bill Plymale (plymale@mousetrap.es.vt.edu) wrote: : Any thoughts or concerns associated with constructing an : antenna using dissimilar materials? For instance, a beam : consisting of a copper boom and aluminum elements. : "Half-inch" copper tubing is readily available, half-inch : aluminum tubing is not. You will probably have corrosion problems if the two dissimilar metals contact each other. Note that antenna dimensions change if the elements are isolated or not. The ARRL Antenna Handbook lists dimensions for both. Greg KD6KGW ------------------------------ Date: 9 Apr 1994 11:55:42 GMT From: ihnp4.ucsd.edu!swrinde!emory!news-feed-2.peachnet.edu!insosf1.infonet.net!solaris.cc.vt.edu!mousetrap.es.vt.edu!plymale@network.ucsd.edu Subject: Antenna materials... To: ham-ant@ucsd.edu Any thoughts or concerns associated with constructing an antenna using dissimilar materials? For instance, a beam consisting of a copper boom and aluminum elements. "Half-inch" copper tubing is readily available, half-inch aluminum tubing is not. Thanks ... Bill (KD4CIY) -- Bill Plymale plymale@mousetrap.es.vt.edu 703-231-9530 Virginia Tech - Information Systems ------------------------------ Date: Sun, 10 Apr 1994 01:59:32 GMT From: ihnp4.ucsd.edu!library.ucla.edu!csulb.edu!csus.edu!netcom.com!gbrent@network.ucsd.edu Subject: Coax Loss on HF To: ham-ant@ucsd.edu ------------------------------ Date: Sun, 3 Apr 1994 17:17:53 GMT From: ihnp4.ucsd.edu!library.ucla.edu!europa.eng.gtefsd.com!darwin.sura.net!news.Vanderbilt.Edu!news@network.ucsd.edu Subject: Egg beater? To: ham-ant@ucsd.edu Jeff, Eggbeaters are antennae make by M**2 engineering which are more or less omnidirectional no matter how you look at them. They strongly resemble half of an old mixer, such as was used in baking and scrambling eggs. I personally have not used them, but most of the reports I have seen from people using them for amateur satellite work are that for that application they work, but not well enough to recommend. Alan Recommended four line signature. ------------------------------ Date: Sat, 9 Apr 1994 06:52:24 GMT From: ihnp4.ucsd.edu!agate!howland.reston.ans.net!ee.und.ac.za!csir.co.za!hippo.ru.ac.za!caesar.wits.ac.za!dlab164.ee.wits.ac.za!budhia@network.ucsd.edu Subject: Help for low cost antenna To: ham-ant@ucsd.edu I require some info on designing a low cost antenna to rural communities where signal levels are fairly low. Thus a low cost outdoor antenna is required. Any help on design procedures or even examples of existing antennas would be appreciated. Thanks Harshik ------------------------------ Date: 9 Apr 1994 05:36:35 GMT From: ihnp4.ucsd.edu!usc!cs.utexas.edu!chpc.utexas.edu!news.utdallas.edu!corpgate!bnrgate!bnr.co.uk!uknet!demon!news2.sprintlink.net!news.sprintlink.net!indirect.com!kg7bk@network.ucsd.edu Subject: HF antenna help To: ham-ant@ucsd.edu Chuck Hawley (hawley@aries.scs.uiuc.edu) wrote: : HarrisR@yvax.byu.edu (Richard Harris) writes: : Put up a 100 or so foot dipole as high as you can get it, and feed it with : 450 ohm ladder line. Run it through a 2KW tuner to a 100 Watt transceiver. : 73, Chuck Hawley, KE9UW, Urbana, IL : >Richard Harris Hi Richard and Chuck, I agree 100% and there are some little known facts that accompany this non-resonant, center-fed, dipole, Zepp, G5RV, whatchamacallit. A center-fed dipole is resonant at any number of frequencies. The name, non-resonant, means that it is not resonant on an AMATEUR band. It is a half-wave at some frequency and therefore, resonant at that frequency (and any multiple of that frequency). A 102 ft. antenna is a half-wave around 4.6 MHz. An 88 ft. (my antenna) is a half-wave around 5.3 MHz. At about three times the half-wave frequency, the radiation pattern from these antennas changes from a two-lobe broadside pattern to a four-lobe clover-leaf pattern with very little broadside radiation. Don't expect your 102 ft. G5RV to radiate broadside on 17m. (Some would say, don't expect your G5RV to radiate at all on 30m and 15m). The frequency at which a 102 ft center-fed antenna changes from two lobes to four lobes is 20m. One will see both the two side lobes and the four cloverleaf lobes for a total of six lobes on 20m because three times 4.6 equals 13.8. I chose 88 ft for my antenna because it has the two side lobes on 20m to cover Australia and South Africa and has the four cloverleaf lobes on 17m to cover Asia, New Zealand, Central/South America, and Europe. In Arizona, I had to orient it N10W to aim the four lobes in the proper directions. If one doesn't orient the antenna properly, most of the RF can be radiated over the oceans instead of over land. And please don't contribute to global warming by feeding this kind of antenna with coax. Use near-lossless ladder-line. Mother Nature will thank you. 73, Cecil, kg7bk@indirect.com ------------------------------ Date: Sun, 10 Apr 1994 08:00:01 GMT From: agate!library.ucla.edu!csulb.edu!csus.edu!netcom.com!potaczek@ames.arpa Subject: HF in an apartment To: ham-ant@ucsd.edu ------------------------------ Date: 8 Apr 1994 12:15:06 -0400 From: ihnp4.ucsd.edu!galaxy.ucr.edu!library.ucla.edu!europa.eng.gtefsd.com!gatech!news.ans.net!hp81.prod.aol.net!search01.news.aol.com!not-for-mail@network.ucsd.edu Subject: Isoloop Experiences? To: ham-ant@ucsd.edu In article <2o0sp8$r4j@wrdis02.robins.af.mil>, lakeith@robins.af.mil (CONTRACTOR Larry Keith;653 CCSG/SCT) writes: >>real world experiences I've had mine up for almost two years (8 feet above chimney cap on two-story house), and worked 230 countries with it (215 confirmed), won certificates for both an ARRL and CQ WW DX contest (15m CW, low power, sixth call area), worked 39 zones in 6 months (and will probably die never working zone 34), and generally have a good time with it. The constant re-tuning is a pain, and the automatic tuner didn't work for me. Until I can overturn the XYL zoning restriction at this QTH, it will have to do. Danny AE9F/6 ------------------------------ Date: 9 Apr 1994 00:18:46 -0400 From: ihnp4.ucsd.edu!usc!sol.ctr.columbia.edu!news.mtu.edu!news.mtu.edu!not-for-mail@network.ucsd.edu Subject: Ladder Line To: ham-ant@ucsd.edu Where does one aquire 450ohm transmission quality ladderline? I have seen in included in those over priced dipole kits, but I haven't found it anywhere sold sepperatly. Is there a suitable substitute? Has anyone tried the stuff for roof mounted TV antennas? Will that type of ladder line work? I have heard many people talk about making their own ladder line. Can anyone offer some suggestions on how to make your own ladder line? Thanks Chris -=- N8PBI ------------------------------ Date: 9 Apr 1994 05:28:07 GMT From: usc!howland.reston.ans.net!cs.utexas.edu!chpc.utexas.edu!news.utdallas.edu!corpgate!bnrgate!bnr.co.uk!uknet!demon!news2.sprintlink.net!news.sprintlink.net!indirect.com!kg7bk@ihnp4.ucsd.edu Subject: Ladder Line To: ham-ant@ucsd.edu Christopher D. Sorensen (cdsorens@mtu.edu) wrote: : Where does one aquire 450ohm transmission quality ladderline? I have seen in : Chris -=- N8PBI Hi Chris, don't bother building ladder-line unless you have time to kill. It's about $15 per 100 ft from Antennas West, 1-800-926-7373 73, Cecil, kg7bk@indirect.com ------------------------------ Date: Sat, 09 Apr 94 20:54:37 PDT From: ihnp4.ucsd.edu!swrinde!emory!sol.ctr.columbia.edu!newsxfer.itd.umich.edu!nntp.cs.ubc.ca!mala.bc.ca!oneb!ham!emd@network.ucsd.edu Subject: Ladder Line To: ham-ant@ucsd.edu cdsorens@mtu.edu (Christopher D. Sorensen) writes: > Where does one aquire 450ohm transmission quality ladderline? I have seen in > included in those over priced dipole kits, but I haven't found it anywhere so > sepperatly. Is there a suitable substitute? Has anyone tried the stuff for > roof mounted TV antennas? Will that type of ladder line work? > > I have heard many people talk about making their own ladder line. Can anyone > offer some suggestions on how to make your own ladder line? > > Thanks > > Chris -=- N8PBI > Try calling Amateur Radio Supply in Seattle at 1-800-457-2277. I've seen some there, and they ship to the US, Canada and Puerto Rico. 73, Bob. Robert Smits There is *no* idiotproof filter. VE7EMD Idiots are proof against anything! Ladysmith B.C. - Richard Chycoski, VE7CVS e-mail: emd@ham.almanac.bc.ca ------------------------------ Date: Sat, 9 Apr 1994 06:42:56 GMT From: ihnp4.ucsd.edu!agate!howland.reston.ans.net!ee.und.ac.za!csir.co.za!hippo.ru.ac.za!caesar.wits.ac.za!dlab164.ee.wits.ac.za!budhia@network.ucsd.edu Subject: Low cost antenna for Tv To: ham-ant@ucsd.edu I require some info on designiing a low cost antenna to rural communities where signal levels are fairly low. Thus a low cost outdoor antenna is required. Any help on design procedures or even examples of existing antennas would be appreciated. Thanks Harshik ------------------------------ Date: Sat, 9 Apr 1994 06:56:37 GMT From: ihnp4.ucsd.edu!agate!howland.reston.ans.net!ee.und.ac.za!csir.co.za!hippo.ru.ac.za!caesar.wits.ac.za!dlab164.ee.wits.ac.za!budhia@network.ucsd.edu Subject: low cost antenna required To: ham-ant@ucsd.edu I require some info on designing a low cost antenna to rural communities where signal levels are fairly low. Thus a low cost outdoor antenna is required. Any help on design procedures or even examples of existing antennas would be appreciated. Thanks Harshik ------------------------------ Date: Sat, 09 Apr 1994 12:53:12 -0500 From: ihnp4.ucsd.edu!agate!howland.reston.ans.net!cs.utexas.edu!swrinde!elroy.jpl.nasa.gov!ncar!hsdndev!NewsWatcher!user@network.ucsd.edu Subject: Rugged Repeater Antennas, Advice Needed To: ham-ant@ucsd.edu I run two repeaters atop an isolated 2000 ft mountain in central VT where the weather can be cruel on antennas. Over the past 5-6 years both 146.97 & 224.68 Sinclair Stationmasters (top mounted side by side 10 ft apart on a Tee) developed leaks in their protective coverings, presumably due to UV radiation and wind, and must be replaced. I would very much appreciate other's experiences with the guality, durability, SWR, radiation patterns, and gain of other high quality stationmaster-like antennas before I expend lots of money to replace the old antennas. Please e-mail responses to duffyr address below. Frank K1MOQ (K1MOQ/R Tunbridge,VT, Orange County VT ARS) -- Frank H. Duffy, MD e-mail: duffyfr@a1.tch.harvard.edu Neurology, Childrens Hospital workstation: fhd@fhd486.harvard.edu & Harvard Medical School FAX: (617) 735-7230 300 Longwood Avenue voice: (617) 735-7919 / 7846 Boston, MA 02115 USA amateur radio: K1MOQ ------------------------------ Date: 9 Apr 1994 22:01:10 -0400 From: ihnp4.ucsd.edu!usc!sol.ctr.columbia.edu!news.mtu.edu!news.mtu.edu!not-for-mail@network.ucsd.edu Subject: Temporary HF Mobile ant? To: ham-ant@ucsd.edu Can anyone give some suggestions for a temporary mobile HF antenna. I will be borrowing a car from the company I work for to use on my trip to Dayton and would like to work HF on the way down. I have never worked HF mobile because I didn't have a suitable rig untill now. I have an FT890 with the automatic tuner. Can anyone reccomend a decent antenna for probably 40meters? or whatever band is best for HF mobile. The installation must be temporary and not do any damage to the car. (Ie: No big scratches)... I will probably be picking up a good HF mobile antenna at Dayton for my personal vehical but would sure like to get something on the air for the trip down. Any suggestions would be greatly appreciated! 73, Chris -=- N8PBI ------------------------------ End of Ham-Ant Digest V94 #98 ******************************