You might want to download and compare the db-408 sheet, available in the same section. The text includes the coax harness lenghts for the DB 450-470 MHz segements.
Through the years, the commercial antenna versions of this antenna had some changes... the mount changed from a tube to the current 1" bent bar (which appears pretty easy to duplicate). Charles' article shows the dipole welded to the mount tube. The early DB versions used pressed and rivot fits with hose clamp mounts. Might be easier to press/rivot secure the elements if you don't have a welder, but Charles method is much more hardy. I could snap some pictures of the older vs new mounts and have Mike make them available. (If there's any interest in said pictures...) One yet to be sorted issue is the dipole centering. Most of the commercial models have the dipole centered around the mount tube. I have one or two factory DB versions of these dipole antennas with the dipole shifted (ie more of the dipole toward the ground or high side). I'll be asking a few antenna enginners I know (at IWCE in April), why the shift done. cheers, skipp > "Gerald Pelnar" <[EMAIL PROTECTED]> wrote: > I think this is the article you are looking for: > > http://www.repeater-builder.com/antenna/440fdipl.pdf > > 73, > Gerald Pelnar > McPherson, KS > [EMAIL PROTECTED] > http://members.cox.net/wd0fyf/ > > ----- Original Message ----- > From: "Richard D. Reese" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Friday, March 25, 2005 23:17 > Subject: [Repeater-Builder] 440 4 Pole Antenna > > > I hope Chuck Kelsey sees this - - - > > About 15 or twenty years ago there was an article published in either Ham > Radio or perhaps 73 magazine on the construction of a 440 4 pole antenna. > It was written by Chuck WB2EDV if my memory is correct. > > I built one for a friend and he has removed it from his tower for > maintenance. He is now ready to place it back on the tower legs and asked > me what the spacing is between elements. Well I cannot fond the paper work. > I think it was 23 inches on center. Chuck, is that correct? > > Thanks in advance. > > Rich WA8DBW > > > > Richard D. Reese > http://www.wa8dbw.ifip.com Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
