it this is like most tower work it will need to be approved by an engineer and to do that home made will not work. I would never allowed it on my tower and the insurance co would not also. needs to have the correct wind load use. Go to Rohn and get it done right the first time and safely.
----- Original Message ----- From: Eric Lemmon To: [email protected] Sent: Sunday, December 09, 2007 2:06 PM Subject: RE: [Repeater-Builder] Antenna standoff recomendations Robert, An offset of six feet is going to require some pretty hefty support members. Check out the mounting hardware shown for the DB224 and DB228 on the Andrew catalog page: <www.andrew.com/catalog/product.aspx?id=135&ShowObsolete=false&filter=466|3| |0||> or use this TinyURL: <http://tinyurl.com/yvpqs6> Once that you find out that the side-mounting hardware might cost more than the antenna, and you start thinking about making your own side mount out of Unistrut, make sure everything is as corrosion-proof as possible. The lateral pipes or struts and clamps should be hot-dip galvanized. Bolts, nuts, and washers should be high-strength stainless steel if not hot-dip galvanized. If the tower you will use is at one side of the intended coverage area, think about arranging the dipole elements in an offset configuration. This will allow you to use the tower as part of the pattern shaping, and will greatly reduce the distance from the tower. It also reduces the moment arm of the antenna, and the resulting twist of the tower. Contact Andrew Tech Support for guidance on side-mounting the DB224 and DB228. 73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of georgiaskywarn Sent: Sunday, December 09, 2007 10:22 AM To: [email protected] Subject: [Repeater-Builder] Antenna standoff recomendations Hi Folks, Before looking on Hutton and Tessco (others?) sites, wanted to ask the group about some recommendations for a new site. Looking for a antenna standoff for the db224 and db420 antennas. Standoff MUST be able to stand off about 6ft min. from the tower. The tower is a Rohn SSV tower. The standoff *may* be mounted on the 5.5" pipe, however it may be on the smaller pipe (gets smaller as it gets higher). Also will be needing the sway bar for that length as well. Any recommendations before digging into the catalogs. Going to be making recommendations to our group that will be doing the grant writing for our repeaters going up. Thanks, Robert Burton KD4YDC DEC NWS in Peachtree City, GA. www.georgiaskywarn.com
