Date: Mon, 19 Sep 94 04:30:14 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 #314 To: Ham-Ant Ham-Ant Digest Mon, 19 Sep 94 Volume 94 : Issue 314 Today's Topics: 2m vertical in my tree - how to? 9913 Alliance 73 Manual antenna "K" factor again Bilal ISOTRON 160m antenna comments? Coaxial into the House Discone on 2 meters Discones as transmitting antennas Half Square Antennas (2 msgs) HF Mobile . . . Pool screen as ground? RS twinlead antenna 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: 13 Sep 1994 15:32:46 GMT From: agate!howland.reston.ans.net!europa.eng.gtefsd.com!newsxfer.itd.umich.edu!news.cic.net!ddsw1!redstone.interpath.net!news.sprintlink.net!tequesta.gate.net!hopi.gate.net!optronic@ames.arpa Subject: 2m vertical in my tree - how to? To: ham-ant@ucsd.edu The highest point of my lot is an oak tree. It is a good 20' higher than my roof peak. Two reasons for considering placement in the tree are: 1) homeowners assoc. prohibits antennas on roof, & in tree it will be somewhat hidden. 2) it's there and higher already. Has anyone made tree installations? I would interested in hearing about it. I would expect a slight loss being mounted against a 5-8" dia. live tree trunk compared to free air. I'm looking at something like the Cushcraft ringo ranger 2 vertical. Thanks for any comments, Bob B. KE4PGM optronic@gate.net ------------------------------ Date: 18 Sep 94 23:22:37 GMT From: news-mail-gateway@ucsd.edu Subject: 9913 To: ham-ant@ucsd.edu Jim, on the 9913: I run the 9913 to the base of the tower and tie it off there. RG-213 runs up & down the tower. However on your subject at the rotor: aa5yu just a few miles down the road runs his all the way to the antenna and puts big loop around the rotor. No problems so far. Again, waterproof it well. -- 73 =========================================================== Robert Wood WB5CRG w5robert@blkbox.com (blkbox is NOT blackbox, inc.!) w5robert@blkbox.com@menudo.uh.edu ============================================================ ------------------------------ Date: Sat, 17 Sep 1994 16:51:13 From: dog.ee.lbl.gov!agate!darkstar.UCSC.EDU!news.hal.COM!olivea!charnel.ecst.csuchico.edu!yeshua.marcam.com!zip.eecs.umich.edu!panix!ddsw1!redstone.interpath.net!news.sprintlink.@ihnp4.ucsd.edu Subject: Alliance 73 Manual To: ham-ant@ucsd.edu Picked-up a model 73 rotator at aham-fest today and need the wiring diagram or manual, If you have either I would appreciate a e-mail response. More than willing to reimburse for copies and postage 73 < john> ------------------------------ Date: Sun, 18 Sep 1994 16:37:07 GMT From: iglou!iglou!jockellp@uunet.uu.net Subject: antenna "K" factor again To: ham-ant@ucsd.edu The original question was, how do you calculate the "K factor" for a given diameter element used at a specific frequency . I apologize to all who may have discussed the question and I will try to keep my head out this time. Thanks for any comment you have made or will make about this question, Phil - N4GWV (the one who forgets how to use the USENET mail reader...) ------------------------------ Date: 13 Sep 1994 18:16:12 GMT From: yuma!galen@purdue.edu Subject: Bilal ISOTRON 160m antenna comments? To: ham-ant@ucsd.edu Anyone using a Bilal Isotron antenna (the one with the coil and plates)? I'm interested in the 160m version, since it's not longer than my lot. Galen, KF0YJ ------------------------------ Date: Tue, 13 Sep 94 07:08:47 MST From: agate!howland.reston.ans.net!vixen.cso.uiuc.edu!newsrelay.iastate.edu!newsxfer.itd.umich.edu!jobone!lynx.unm.edu!dns1.NMSU.Edu!usenet@ames.arpa Subject: Coaxial into the House To: ham-ant@ucsd.edu On 13 Sep 1994 11:41:31 GMT, W. E. Van Horne wrote: >Rafael Solis (rafaels@zimmer.csufresno.edu) wrote: > > >: Well, I finally bought a 2 mt. external antenna which I already installed. I >: live in a fairly new house whose (outside) walls are covered with stucco >: (sp?). All windows have aluminum frames. Before I start drilling the stucco >: and/or the windows' frames I thought in asking to you'all about feeding >: coaxial through the walls and/or windows. Please send me a line or two. > >I have the same situation. To make the hole and lead-in unobtrusive, I >keep them near the ground, behind bushes. Select the place inside the >house where you want the cable to come in and get a wood bit and a masonry >bit for your drill, making sure they are long enough to reach all the way >through the inside and outside walls. I use 3/8" holes. I drill one hole >for each cable or ground lead, etc. > >Radio Shack sells little plastic molded bushings with 1/4" I.D. to fit into >each end of the hole. After the coax is threaded through, calk around it >to seal the hole. The cable on the outside should bend downward, so that >rain water will trickle away from the port, not into it. > >If and when you want to remove the lead-in, it is a lot easier to make a >nearly invisible patch in a hole in stucco than in a window frame! > Easier way is to place a piece of wood or plastic on the window close the window on it with some weather strip around it then drill into the piece you just put in the window. When you move throw away the insert and close the window. Good Luck William Osborne 505-646-3919 Professor ECE Dept. PO BOX 30001, Dept. 3-O New Mexico State University Las Cruces, NM 88003-0001 ------------------------------ Date: Sun, 18 Sep 1994 16:47:51 GMT From: iglou!iglou!jockellp@uunet.uu.net Subject: Discone on 2 meters To: ham-ant@ucsd.edu Just thought I would echo the probable ton of replies. A discone antenna functions as a 1/4 wavelength antenna over iits operating range. No surprise that it functions much better than a rubber duck, huh. If it were me, I would not go to the extra expense and trouble of buying and installing a 1/4 wave ground plane to replace the discone. It already is one, plus a whole lot more. Of course, if you want to use the discone for something else, like a scanner, or whatever, then replacing it makes sense. Did you know that the discone will work just fine for 440 MHz as well? Actually any frequency in its design range can be used for transmit. I use one here and am very satisfied woth it (the Radio Shack model). 73, Phil - N4GWV ------------------------------ Date: 15 Sep 1994 18:52:47 GMT From: ihnp4.ucsd.edu!swrinde!emory!europa.eng.gtefsd.com!howland.reston.ans.net!math.ohio-state.edu!magnus.acs.ohio-state.edu!csn!yuma!galen@network.ucsd.edu Subject: Discones as transmitting antennas To: ham-ant@ucsd.edu In article <1994Sep15.174648.27018@chemabs.uucp> vjh21@cas.org (Vince Herried ext 2877) writes: >NON active antennas no matter what configuration all share >what I'm gonna call a resiprosity. What this means is the >antenna has the same radiation characteristics when transmitting as it >does when receiving. > >I'll stand back and let the experts give a better reply. Close, but it's spelled 'reciprocity'. ( I really shouldn't comment on other people's spelling) Galen, KF0YJ ------------------------------ Date: 18 Sep 1994 08:22:04 GMT From: svc.portal.com!shell.portal.com!becker@uunet.uu.net Subject: Half Square Antennas To: ham-ant@ucsd.edu At 6:04 PM 94.9.12 +0900, ken silverman wrote: >Feed at top corner: >---->___________ > | | > | | > | | > | | > The new ARRL antenna book describes an "Off Center Fed Dipole", and makes a point about the name "Windom" being inappropriate. OCF _________: :___________________ 80m/40m/20m/10m Zr 200 ohm length 132 feet, fed at 44 feet from one end. Half Sq. : :__________ 80m/40m/20m/10m Zr 150 ohm | | length 126 feet, | | vertical portion, 42 feet. | | | | | | The ARRL Antenna Book points out the necessity of a current, or choke type balun, as the antenna is _not_ symetrical, and current will be induced on the outside of the feedline. Tony Becker - becker@shell.portal.com - Silicon Valley, U.S.A. ------------------------------ Date: 18 Sep 94 08:19:38 GMT From: news-mail-gateway@ucsd.edu Subject: Half Square Antennas To: ham-ant@ucsd.edu At 6:04 PM 94.9.12 +0900, ken silverman wrote: >Feed at top corner: >---->___________ > | | > | | > | | > | | > The new ARRL antenna book describes an "Off Center Fed Dipole", and makes a point about the name "Windom" being inappropriate. OCF _________: :___________________ 80m/40m/20m/10m Zr 200 ohm length 132 feet, fed at 44 feet from one end. Half Sq. : :__________ 80m/40m/20m/10m Zr 150 ohm | | length 126 feet, | | vertical portion, 42 feet. | | | | | | The ARRL Antenna Book points out the necessity of a current, or choke type balun, as the antenna is _not_ symetrical, and current will be induced on the outside of the feedline. Tony Becker - becker@shell.portal.com - Silicon Valley, U.S.A. ------------------------------ Date: 15 Sep 1994 17:59:12 GMT From: nwnexus!krel.iea.com!comtch!pfeuffer@uunet.uu.net Subject: HF Mobile . . . To: ham-ant@ucsd.edu . . . I'm looking for the company that makes a mount for an HF whip to a trailer hitch. Any help would be appreciated. 73 KW1K P.S. If I can get on HF mobile -- I'll be able to drive 90 miles and put some of them "rare" Idaho and Montana counties on the air! ------------------------------ Date: Sun, 18 Sep 94 20:19:49 -0500 From: news.delphi.com!usenet@uunet.uu.net Subject: Pool screen as ground? To: ham-ant@ucsd.edu This may be stupid, but...I'm going to mount a vertical near my pool screen (in Florida) ..can I take the negative of being near a major metal structure with a ground-mounted vertical by tying a ground radial into then? If so, should I ground the pool screen with a ground rod(it doesn't contact the ground)? Would anyone touching the screen during transmitting be in danger of RF burns? ------------------------------ Date: Sun, 18 Sep 1994 16:51:00 GMT From: newsflash.concordia.ca!nstn.ns.ca!cs.dal.ca!cfn.cs.dal.ca!aa568@uunet.uu.net Subject: RS twinlead antenna To: ham-ant@ucsd.edu Hi, a little while back I noticed a posting about an antenna made with radio shack twin lead over some other kind, if the person who made the original post, or any one else with the plans for this please e-mail the plans for the antenna, or post for every one ???? Thanks in advance. 73 Ross -- ___________________________________________________ | / | | Ross Blakeney \ " No man has a good | | VE1RFB / memory to make a | | Grid: FN84fp \ successful liar." | | aa568@cfn.cs.dal.ca / --Abraham Lincon-- | | \ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ------------------------------ End of Ham-Ant Digest V94 #314 ******************************