Return-Path: Sender: (Marvin Kaye) To: lml Date: Wed, 04 Sep 2002 09:53:28 -0400 Message-ID: X-Original-Return-Path: Received: from spknpop1.spkn.uswest.net ([207.108.48.1] verified) by logan.com (CommuniGate Pro SMTP 4.0b7) with SMTP id 1721369 for lml@lancaironline.net; Wed, 04 Sep 2002 09:40:47 -0400 Received: (qmail 51820 invoked by uid 0); 4 Sep 2002 13:34:18 -0000 Received: from spkndslgw6poolc163.spkn.uswest.net (HELO ckrouse) (63.227.99.163) by spknpop1.spkn.uswest.net with SMTP; 4 Sep 2002 13:34:18 -0000 X-Original-Message-ID: <003c01c25419$0d2d8dc0$a363e33f@ckrouse> From: "C Krouse" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] LNC2 tail comm antenna X-Original-Date: Wed, 4 Sep 2002 06:43:27 -0700 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2615.200 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2615.200 Charles, I would only worry about it if you are installing "handmade" antennae. If you are installing commercially made antenna, then for all of your radio equipment, I can only suggest that you talk to your local ham radio shop and find out if there is a ham in your area who might have or be able to get the proper equipment to sweep through the bandwiths that you want tested. If you are using commercially made antenna, then I would just take your cables and get them swept to see if you have a problem with them. Or you could test them out during your test flights and rate your signals with each flight and log them. I don't believe that you have to SWR test every radio in your plane when you build them unless you are handmaking your antenna. Then it is a good idea to test them before you close out the areas. Commercially made antenna are designed and tested to work before they are sold. The only thing that you can really screw up is the cable and the installation. By installation I mean to say that you can install it in the wrong place to interfere with it's operation, ie next to metal or under carbon fiber panel etc. If you are really worried about your install, make sure that you install all your antenna in a manner where you can totally remove and replace the cable. That will save you most of the grief that you will encounter. Curtis > Curtis Krouse --- Your 27 Aug. post raised a couple of questions: > 1) For COMM antenna we can use our handheld to provide a signal, > but what can we do for passive antennas like VOR or MB, or transponder > antennas? > 2) You suggest shortening or lengthening the coax cable to adjust > the SWR. I would assume that while doing either the SWR would rise and > fall sinusoidally as the length increases or decreases. Do you have any > idea of what kind of cable length we would see from one minimum to the > next? (You must enjoy installing and removing BNC connectors.) > Charles