Actually Jeff Depolo is much better versed to explain this than I am. Hopefully he can enter into this thread. I don't have an engineering background, and don't play an engineer on TV. I haven't even stayed at a Holiday Inn Express :-)
Chuck WB2EDV ----- Original Message ----- From: "Matt" <[email protected]> To: <[email protected]> Sent: Friday, October 09, 2009 6:55 PM Subject: [Repeater-Builder] Re: feeding two 120 degree sector antennas > Thanks for replying Chuck. The antennas are not perfectly back to back. > More like 60 degrees from each other. > > I would have thought I'd have a null in one direction. Is there a better > way to do this? > > I want close to the 11 dB gain my omni has, but with more down tilt. > > Thanks, > > 73 > > Matthew > KC7EQO > > --- In [email protected], "Chuck Kelsey" <wb2...@...> > wrote: >> >> Are the two antennas pointed the same direction? If they are back to >> back, >> I'd guess that your results are what I'd expect. >> >> Chuck >> WB2EDV >> >> >> >> ----- Original Message ----- >> From: "Matt" <kc7...@...> >> To: <[email protected]> >> Sent: Friday, October 09, 2009 2:29 PM >> Subject: [Repeater-Builder] feeding two 120 degree sector antennas >> >> >> >I am experimenting with some 3 Ghz antennas. I have a 2 way power >> >divider >> >feeding two 120 degree sector antennas rated at 15 dBi each. I have a 11 >> >dBi omni that I am comparing it too. It seems the omni is getting better >> >performance then the array is. I am seeing more than a 4 dB difference, >> >loss. My goal is to get more down tilt in my antenna pattern, as the >> >sectors offer a mechanical down tilt. >> > >> > Am I doing something wrong? >> > >> > I am feeding the antennas with LMR400 and feed is short as possible. >> > Each >> > feed from the divider is 15 inches long to the antenna. The insertion >> > loss >> > in the divider is <0.4 dBi according to the spec sheet. >> > >> > Thanks in advance, >> > >> > Matthew >> > >> > >> > >> > ------------------------------------ >> > >> > >> > >> > Yahoo! Groups Links >> > >> > >> > >> > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > >
