On Wed, 10 Mar 2010, afa5tp wrote: > I have three (3) Antel [BCD 80010] 806-900 mHz vertical antennae that > I would like to mount on the three legs of my tower for omni pattern > (Rec. only). Several questions come to mind. > > 1.) At the rated frequency, how many inches should the side arm place > the ant. from the tower?
1/4 wavelength from a large plane reflector, mounted in the middle of the reflector. > 2.)What would be the best way to phase the antennae? I have a Andrews > three port "Splitter", and will use "LDF4-50A for feedline. I would > suspect the length of the pigtail from each antenna to splitter is > going to be critical.......or not, for receive only? 33% to each side, 120-degrees electrical length (I think). And be sure your tower can take the windload of sheet aluminum on all faces for 1.5 wavelengths below and above the omnis. Look at a feed arrangement for a "big wheel" antenna that has three petals instead of four. -- Kris Kirby, KE4AHR Disinformation Analyst
