Modeling software is not that expensive, unless you need NEC4. In fact
you may be able to get it for free. I once had a 40m beam with an 80m
dipole fed with separate coax and I currently have a 20m/40m beam fed with
separate coax. It works well. Putting both 30m and 40m Yagis on the same
boom should be easy and With careful modeling it can also be done with a
single coax if that is important.
GL,
John KK9A
To: towertalk@contesting.com
Subject: [TowerTalk] 30/40m on 1 boom
From: Ed Stallman <ed.n5dg@gmail.com>
Date: Fri, 7 Oct 2016 09:47:17 -0500
I like building my antennas , I can build a shortened 2 element 30 or 40m
using loading coils but not sure about having both on same boom . Be nice
using one feedline but I'm okay using separate feedlines for each band. I
see the big antenna manufactures doing it with success . Does anyone have
a recipe for an antenna like this ? Or can point me to a URL that I've
overlooked in my searching ? Using antenna software is above my pay grade
but good with hand and tools
Thanks Ed N5DG
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