[amsat-bb] Mast - non-conductive
n6jsx at yahoo.com
Fri Mar 25 18:12:01 UTC 2016
This method works well and many of us making VHF Quads/Quagis have been doing this since the 80's. But why go to the expense of Fiberglass tubes - we use thick wall UV-PVC with a wooden down inside to stiffen giving it much strength.
I use PVC w/wood for the Quad boom and vehicle Mast for "T" hunting. Trust me, high vehicle speeds and low tree limb grabbers we find during a southern California T-Hunt is very stressful to any vehicle antenna/mast above the hole in our vehicle roof. Some of us use Gorilla-Glue as a filler between the dowel and PVC (as Gorilla-glue expands making a solid fit).
I use 1.25" PVC sched-80 w/wood for my SAT antenna cross-member boom - keeping it non-conduction/metal free to insure no skewing of the directional lobes within the field pattern.
Dale Kubichek, MS-EET, N6JSX
Sidney, OH 45365 EN70vh
Date: Fri, 25 Mar 2016 06:04:55 -0500
From: Alan <wa4sca at gmail.com>
To: "'AMSAT -BB'" <amsat-bb at amsat.org>
Subject: Re: [amsat-bb] Fiberglass Poles for Antenna Mounting?
Another trick for strengthening fiberglass tubing is to get wood round stock at Lowes or Home Depot that
will just fit inside the tubing. Years ago I found something which was a perfect friction fit, though
obviously it depends on the tubing. Cut the wood about 2" shorter than the tubing, and center it
leaving a 1" space at each end. I stood the tubing on end, and filled the top with RTV. After it
hardened, I reversed the tubing and repeated the process. The result was lighter than a solid
fiberglass rod, waterproof, and lasted for 15 years until the whole thing came down in a windstorm.
73s, Alan WA4SCA
More information about the AMSAT-BB