AJ, I have five antennas now in service that are mounted to wooden utility poles using Decibel Products (now Andrew Telecom) DB365W mounts. These come packed as a pair of brackets for about $75, and are available from commercial radio supply houses like Tessco, Talley, and Hutton. These brackets are immensely strong, and can also be used to mount a mast against a masonry wall.
Generally, you don't need to concern yourself about offsetting from the side of a wooden pole, since it is nonconductive. That said, most installers will install the mounts close to the top of the pole, simply to achieve the greatest height possible. When the DB365W mounts are properly installed, the mast actually is offset about 4" from the side of the pole. I normally use one or two heavy galvanized washers on the upper mount, to compensate for the pole taper, thereby ensuring that the mast is plumb. 73, Eric Lemmon WB6FLY -----Original Message----- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of AJ Sent: Monday, January 25, 2010 9:21 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Side mount to wooden utility pole? Looking at side mounting a fiberglass repeater antenna on a wooden utility pole. Previously had railroad microwave dishes at the very top (about 55' AGL) which has since been decommissioned. Our permit allows up to 35' AGL to the base of the antenna. We've been going back and forth with one of the local hams that happens to be an engineer with regard to building a side mount from Unistrut channel with roughly a 36" offset from the face of the pole. My question would be what exactly is the minimum spacing for side mounting off of a wooden utility pole? Coverage does not necessarily need to be omnidirectional as there is a fairly large ridge to the east of the site and the targeted coverage area is to the north and west. The photo that got me thinking about this was from the 147.03 repeater move site documentation - http://www.qsl.net/ac7el/RepeaterMove/Antennas.jpg <http://www.qsl.net/ac7el/RepeaterMove/Antennas.jpg> It appears this antenna is maybe 4" offset from the side of the pole. 73, AJ, K6LOR
