Date: Tue, 31 May 94 04:30:12 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 #164 To: Ham-Ant Ham-Ant Digest Tue, 31 May 94 Volume 94 : Issue 164 Today's Topics: 2 meter thru-glass Dipole help Dipole in attic? (2 msgs) FCC licensing delays HamSticks.... Maltese quad 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: Mon, 30 May 1994 23:05:57 GMT From: nwnexus!jhgrud!eskimo!wrt@uunet.uu.net Subject: 2 meter thru-glass To: ham-ant@ucsd.edu In article , David Drumheller wrote: > Look here folks. A lot of technical folklore gets passed around the >amateur community, and some of it is incorrect. But of all the subjects >that suffer from the propagation of inaccurate technical folklore, the >subject of antennas suffers the most. > > I have ask for, and have received advice about antenna installations. >Some of it good, some of it bad. Many opinion are in conflict: > > ...you need a ground plane... no, you don't need one... my >through-the-glass antenna works great... mine sucked, so I returned it... >you must use a balun... why? ... well, just because... RF current occurs >on the feedline ... well then why is the coax on top of the ground plane >(car roof)?... gee, I don't know, good question... > > Now I have to admit that even I have contributed to this problem. > > So now I ask the academics out there to respond, not some elec-tech. > > Question: Has *anyone* done a comprehensive scientific study of the >performance of through-the-glass antennas, or any other mobile antenna >installations. This includes input impedance, radiation patterns, etc. >I'm looking for an IEEE paper showing how Halen's integral equation is >solved, and not some QST article with a couple of mismarked graphs showing >a radiation pattern measured using a field strength meter from Radio Shack >and a tape measure. > > Antenna theory is not my specialty, but it would be refreshing to read >something written by someone with scientific authority, and not by someone >who `know antennas,' but still uses the `left hand rule' to derive the >magnetic field due to electron current flow. > >-Dave >-- >David Drumheller, KA3QBQ phone: (202) 767-3524 >Acoustics Division, Code 7140 fax: (202) 404-7732 >Naval Research Laboratory >Washington, DC 20375-5350 e-mail: drumhell@claudette.nrl.navy.mil Well, we have wine snobs and food snobs, why not antenna snobs? All the IEEE papers in the world aren't worth a plugged nickel until some "elec-tech" goes out with FS meter and tape measure in hand and verifies them. Then and only then will folks believe. Lighten up, Dave. You need both. 73 de W7LZP ------------------------------ Date: Tue, 31 May 94 02:05:03 -0500 From: news.delphi.com!usenet@uunet.uu.net Subject: Dipole help To: ham-ant@ucsd.edu the human ear, on a steady tone, can detect a 2dB difference.....for many, a 1dB difference can be discerned. ------------------------------ Date: Mon, 30 May 94 07:56:18 CST From: ihnp4.ucsd.edu!usc!cs.utexas.edu!howland.reston.ans.net!wupost!slacc.com!doogie@network.ucsd.edu Subject: Dipole in attic? To: ham-ant@ucsd.edu IA>Will 1/2 wave dipole made for a CB work in an attic? IA>--- IA>Thank you, IA>Arik Klingensmith arik.klingensmith@ebay.sun.com It'll work but you won't like it because: 1) Most CBers are vertically polarized - 10 to 25 dB of attenuation. 2) Attic antennas don't radiate as well as outdoor antennas. (est. 3 to 12 dB of attenuation) 3) Attic antennas produce more TVI, RFI ect - coupling into house wiring, close proximity to household receiving devices. 4) It's hard to get a good SWR match - an effect of having an object in close proximity to your antenna. SLACC STACK BBS - St. Louis, Missouri The bulletin board service of the St. Louis Area Computer Club +1 314.367.1903 ------------------------------ Date: 31 May 1994 02:39:22 GMT From: news.delphi.com!domonkos@uunet.uu.net Subject: Dipole in attic? To: ham-ant@ucsd.edu Rather than listening to heresay about 'what someone else said' about attic antennas, try it yourself and see. When folks start throwing dB loss figures at you, ask them what they based the figures on. Being in the comm field and having installed and tested antenna systems w/REAL test equipment I can guarantee you wood has a minimal attenuating effect on HF frequencies, even with all the nail and small metal plates up there. Good luck. Andy ------------------------------ Date: Mon, 30 May 94 07:56:17 CST From: ihnp4.ucsd.edu!agate!howland.reston.ans.net!wupost!slacc.com!doogie@network.ucsd.edu Subject: FCC licensing delays To: ham-ant@ucsd.edu Patience Daryl, the wait will be worth it. SLACC STACK BBS - St. Louis, Missouri The bulletin board service of the St. Louis Area Computer Club +1 314.367.1903 ------------------------------ Date: Tue, 31 May 94 01:49:49 -0500 From: news.delphi.com!usenet@uunet.uu.net Subject: HamSticks.... To: ham-ant@ucsd.edu Stick with Lakeview.....better. ------------------------------ Date: 30 May 1994 15:18:38 GMT From: ihnp4.ucsd.edu!usc!howland.reston.ans.net!pipex!sunic!ugle.unit.no!lise.unit.no!kenneth@network.ucsd.edu Subject: Maltese quad To: ham-ant@ucsd.edu Does anyone have a detailed description of this antenna which I'd like to set up for 20/17/15 meter ?? I understand it's smaller, but still offer me a reasonable performance, and since I have limited space I'm thinking of building this antenna. How is this quad compared to the 'real' quad ??? If anyone have experienced this antenna , pse let me know. Thanks in advance, Kenneth LA7GIA. ------------------------------ End of Ham-Ant Digest V94 #164 ******************************