From owner-qrp-l@Lehigh.EDU Mon Oct 20 09:28:30 1997 Received: from fidoii.CC.lehigh.EDU (fidoii.CC.lehigh.EDU [128.180.1.4]) by oucsace.cs.ohiou.edu (8.8.5/8.8.5) with ESMTP id JAA00679 for ; Mon, 20 Oct 1997 09:28:29 -0400 (EDT) Received: from Lehigh.EDU ([127.0.0.1]) by fidoii.cc.Lehigh.EDU with SMTP id <35310-51912>; Mon, 20 Oct 1997 09:23:36 -0400 Received: from nss4.cc.Lehigh.EDU ([128.180.1.13]) by fidoii.cc.Lehigh.EDU with ESMTP id <34896-33990>; Mon, 20 Oct 1997 09:13:16 -0400 Received: from emout09.mail.aol.com (emout09.mx.aol.com [198.81.11.24]) by nss4.cc.Lehigh.EDU (8.8.5/8.8.5) with ESMTP id JAA34588 for ; Mon, 20 Oct 1997 09:12:59 -0400 Received: (from root@localhost) by emout09.mail.aol.com (8.7.6/8.7.3/AOL-2.0.0) id JAA05765 for qrp-l@lehigh.edu; Mon, 20 Oct 1997 09:12:30 -0400 (EDT) Message-Id: <971020091128_-593621094@emout09.mail.aol.com> Date: Mon, 20 Oct 1997 09:12:30 -0400 (EDT) Reply-To: JCoote@aol.com Sender: owner-qrp-l@Lehigh.EDU Precedence: bulk From: JCoote@aol.com To: "Low Power Amateur Radio Discussion" Subject: More W3EDP ant remarks X-Listprocessor-Version: 8.1 beta -- ListProcessor(tm) by CREN Status: RO Hello to the "List" I've done a fair share of covert and overt MF/HF wire antennas. The W3EDP design is nothing magical. The length of the antenna and counterpoise may be a good combination for matching on some bands without RF on the equipment. It's length is enough for it to produce a similar signal and pattern close enough to that of a dipole or 1/4 to 3/4 wavelengths wire. I have used other wire/counterpoise lengths in my antennas and these worked well. If your tuner is a high-impedance one such as a tapped parallel tank, or an L network- you may prefer antenna lengths which avoid 1/4 wavelength or multiples. If you use a typical Ham "T" network (MFJ, etc) then you may have to search for antenna lengths which are not high impedance (1/2 wavelength or multiples). With the EDP and other end-feds, there will be some directivity off the ends of the wire as you go higher in frequency. Don't be afraid to try other antenna/counterpoise length combinations. 73, Jay W6CJ