Date: Mon, 25 Apr 94 04:30:16 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 #119 To: Ham-Ant Ham-Ant Digest Mon, 25 Apr 94 Volume 94 : Issue 119 Today's Topics: AEA IsoLoop vs. MFJ 1786 HI Q Loop Best city antenna Combined mobile phone/VHF/radio antenna??? help with packet antenna.. phased vertical array software? portable antenna for NVIS? Transceivers in modern cars 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: 25 Apr 94 03:38:07 GMT From: ihnp4.ucsd.edu!usc!howland.reston.ans.net!noc.near.net!news.delphi.com!BIX.com!rpmccoy@network.ucsd.edu Subject: AEA IsoLoop vs. MFJ 1786 HI Q Loop To: ham-ant@ucsd.edu Thanks for the response. I appreciate your interest. I just built the May QST loop this weekend. Unfortunately, the capacitor I had only allows running QRP. I designed mine so it can be mounted either horizontally or vertically. So far, the vertical orientation seems best, as I can't elevate it the recommended 1/2 wavelength. It receives very well. Only a few QSOs so far with 10 - 20 watts. I couldn't find the comparison in QST. I'll look again. Thanks, 73s Dick McCoy N4UN rpmccoy@bix.com ------------------------------ Date: Mon, 25 Apr 1994 01:29:11 GMT From: netcomsv!netcom.com!draziw@decwrl.dec.com Subject: Best city antenna To: ham-ant@ucsd.edu ez041502@chip.ucdavis.edu wrote: : ez041502@chip.ucdavis.edu wrote: [stuff deleted] : Fine. you people are of absolutely no help. Not one response. : I guess I'll just go back to newsgroups that are actually helpful. : Stan "Bye, Bye" Kwong If you not happy the with the responses ask for a refund.. How much did you pay again? Guy, you left helpfull information at all.. What the hell do you want to do with this antenna? What band? If it's scanning go to rec.scanners or is it rec.radio.scanners? What power to you want to run - what modes? etc.... Ryan "Bite me" Radio d00d draziw@netcom.com ------------------------------ Date: 25 Apr 1994 08:32:42 GMT From: ihnp4.ucsd.edu!agate!howland.reston.ans.net!pipex!sunic!news.funet.fi!nntp.hut.fi!vipunen.hut.fi!lerppu@network.ucsd.edu Subject: Combined mobile phone/VHF/radio antenna??? To: ham-ant@ucsd.edu I'm all new to the world of antennas and therefore need information on the following: A company in Finland manufactures a combined mobile phone/VHF/radio antenna for use on boats, in cars or wherever. The antenna is 37 cm long and made of steel rod. It covers frequencies for mobile phone: 860-980 MHz and 435-485 MHz, marine VHF 140-175 MHz and radio 0-110 MHz receiving. The electronics are built into a filter box of about 6*6 cm. The connectors are all BNC connectors. I would like to use a system like this on my sailing boat but I'm not sure it stands up to its promises. Does this sound like a good system? What level of damping does a system like this have? And compared to three different antennas mounted on the top of the mast, does an antenna like this mounted on the same place provide the same range of sending and receiving? What kind of cabling do I need? Please tell me the advantages and disadvantages of a system like this. I'm also interested in the physics of such a system. Thanks in advance Len lerppu@vipunen.hut.fi ------------------------------ Date: Mon, 25 Apr 1994 01:40:20 GMT From: netcomsv!netcom.com!draziw@decwrl.dec.com Subject: help with packet antenna.. To: ham-ant@ucsd.edu desaid@muvms6.wvnet.edu wrote: : Hi Everyone: : I am running a packet TNC on 2 mt radio. Right now i have ground-plane : antenna. It is okay for the time being. I was wondering is there : any better antenna specifically for packet on 2 mt radio. If you have : any suggestion, please post here or email to me. Welp, my fealing, and the general consensus where I'm operating is that a vertical antenna of darn near any kind is that way to go. With beams other directional antennas you may reach the BBS/other party great, but some guy a couple miles off the back of the antenna wont hear you, and you can end up both transmiting at the same time, etc. I'm using a Commet 2m/70cm dual band 5'11 (or so) antenna (don't remember the model), but there are of differant antennas working great on packet. Are you having any problems with what you have now, or is there a particular way you want to improve the way things are now? Are you using a DCD circuit w/ open squelch on your radio? Ryan draziw@netcom.com ------------------------------ Date: Mon, 25 Apr 1994 09:26:08 GMT From: ihnp4.ucsd.edu!galaxy.ucr.edu!library.ucla.edu!europa.eng.gtefsd.com!howland.reston.ans.net!cs.utexas.edu!convex!news.duke.edu!eff!news.kei.com!world!hrick@network.ucsd.edu Subject: phased vertical array software? To: ham-ant@ucsd.edu Can anyone provide pointers to freeware or shareware for computing and/or displaying the signal patterns of phased vertical arrays? ------------------------------ Date: 25 Apr 1994 02:50:03 -0400 From: ihnp4.ucsd.edu!library.ucla.edu!europa.eng.gtefsd.com!news.ans.net!hp81.prod.aol.net!search01.news.aol.com!not-for-mail@network.ucsd.edu Subject: portable antenna for NVIS? To: ham-ant@ucsd.edu 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. >I have looked at the inverted V and the sloping dipole, but they are long >at the 50 plus degree take-off angle needed for NVIS at the 2-7 Mhz >range. Maybe i'm missing something, but: what does the length of the antenna have to do with NVIS excitation per se? Other NVIS systems I'm familiar with have used low (30-50') fan dipoles of about 50' length. Making the dipole into a fan shape (i.e., several conductors per "leg", spread out over about a 20-30 degree angle instead of a single wire) broadens the frequency response of the antenna considerably. Mounting it less than 1/2 wavelength above ground at the highest frequency guarantees that the majority of the radiation will be at elevation angles >45 degrees due to the ground reflection. Other systems use antennas actually mounted on the surface of the earth (Eyring Industries in Utah sells such a system). ------------------------------ Date: 25 Apr 94 14:16:43 GMT From: news-mail-gateway@ucsd.edu Subject: Transceivers in modern cars To: ham-ant@ucsd.edu Hi everybody, I 've recently seen a message about the problems that a radio can create in a modern car computerized ignition and injection system. The person asking was interested in a Honda Accord '89 (sorry, I do not have the name right now, as a mysterious function of the mail program erased the ... "erased files folder"). Althought I do not have exactly a HONDA Accord, I have been using verious transceivers in my HONDA Civic '92, with absolutely no problems. Let me describe the setup, for anyone interested. At the top part of the rear hatch door, the Civic has a small spoiler. This spoiler received the antenna mount, and from there a 5m pre-fabricated cable (from Diamond, sorry no part number now, but if someone is interested I can find it) connects the antenna mount with the transceiver. Until today, I 've used the following rigs, in that car : A Kenwood TM-732, a Kenwood TS-450SAT and a Icom W2 with a Microset 50 Watts linear amplifier (this is the rig most often used in this car). The antennas used were all from Diamond, that is a NR-77 (a 40 cm dual band antenna), a very similar antenna (again no part no) on ly a bit longer, about 1 m total length, and for HF a 7 MHz antenna (which is used only when the car is stationary, as it is quite heavy for the spoiler). I've used this equipment with up to 50 watts for the 2m/70cm rigs and up to 100 watts for the HF, with absolutely NO PROBLEM to the car computer. Actually, I was also a bit worried in the beginning, as the Civic has the computer, under the passenger's feet, which is very near to where the rigs were mounted, but it seems that it is either very well shielded or insensitive to RF. Oh ,yes, the local distributor of Honda, send a fax to the Japanese headquarter s for instructions, but -guess what- they didn't have any information on the topic. Again, I apologize if this message is somewhat vague, as far as part numbers are concerned, but it was written at the office and my RAM doesn't store these things well (parity errors or age symptoms). Best 73 de SV1CEC John Caradimas +-------------------------------------------------------------+ | John Caradimas (SV1CEC) Greek Radio Amateur Station | +-------------------------------------------------------------+ | AX-25 Address : SV1CEC@SV1UY.ATH.GRC.EU | | TCP/IP Address : sv1cec@sv1cec.ampr.org | | Internet Address : sv1cec@athnet.ath.forthnet.gr (home) | | jcaradim@gr.oracle.com (office) | | Mail Address : P.O. Box 31689, 10035, Athens, GREECE | +-------------------------------------------------------------+ | CQ Zone : 20 Locator : KM17UX ITU Zone : 28 | +-------------------------------------------------------------+ ------------------------------ End of Ham-Ant Digest V94 #119 ******************************