6 feet was actually recommended by the site super. I have not ran the numbers yet, but will to see the different wave lengths out from the tower. On this site; http://disneycrazy.smugmug.com/gallery/2241024 (password is magic2006) you will see the old site and the new site. The db420 at the top side of the Rohn45 was out 4ft from the tower. The new site shows some verticles at 6ft from the tower. Another site I am on has several db224's out from the tower at least 6ft. Just starting to look and appreciate all of your comments. 73, Robert KD4YDC
--- In [email protected], "Eric Lemmon" <[EMAIL PROTECTED]> wrote: > > 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 >
