I have a Rohn 55 tower that rotates. I recently built a rotary dipole for 40 meters. It is full size. The center section tubing is 1.625 inches in diameter. It is a split construction. I feed it with
You said dangling. Vertical or horizontal??? Was it the same distance from the guy wires when dangling and bolted??? Did you check for resistance between either side of dipole and tower?? Does SWR ch
Very good questions, Ron. I will attempt to clarify. The antenna always hangs or bolts to the tower horizontally. To raise it, I strung a trolly cable to a point well out from the base of the tower.
Several thoughts - Any insulator increases the capacitance between two plates, PVC has about 3x air dielectric constant, so it is making things worse. Ditch the full collars. I made UV resistant Nylo
I have seen towers change the SWR pattern slightly when mounting, especially near star brackets, but never this much. The mounting plate is only a small portion of the dipole length so I find it hard
Well Dave, my questions were basic but one never knows the expertise of the person asking the question. Obviously you know what you are doing. I learn something new every day so I will be watching fo
It doesn't sound to me like the mounting plate would have a high enough shunt capacitance or loss resistance to bring about the effects you are seeing. Nevertheless, if you wanted to eliminate the po
We mounted a 30-meter full size dipole at 76' assembled from 204BA parts on the side of a Rohn25 tower with coaxial balun. It is spaced about a foot away from the nearest tower side rail, with a matc
For tough insulating material, this stuff is good: http://lists.contesting.com/archives//html/Towertalk/2006-09/msg00158.html Attached is a picture of what it looks like on one of my antennas. Maybe
Author: Russ Dearmore via TowerTalk <towertalk@contesting.com>
Date: Mon, 2 Apr 2018 16:32:03 +0000 (UTC)
Dave, If your redesign of the mounting hardware doesn't fix your problem I hesitate to suggest, since it sounds like you are using a different coax on the tower than which you tested previously, to