John, It depends on the pattern you want.
Me having a repeater about 1/2 mi from the Gulf of Mexico don't want a omni pattern. >From Decibel cat for omni on 18" face tower 3/4 wl appears to be most omni. >1/2 wl give pattern most in 3 directions (N, SE & SW) and slight nulls in 3 >other dir (NE, S & NW). This is for 160 MHz. 73, ron, n9ee/r >From: John Everson <[EMAIL PROTECTED]> >Date: 2008/03/21 Fri AM 01:31:26 CDT >To: [email protected] >Subject: [Repeater-Builder] Optimum Antenna spacing from tower. > >Hello to the group. > >Does anyone know what the optimum spacing away from an 18" faced tower >is to minimize pattern distortion? I have to side mount two DB 224 >antennas and I would like to try to keep the patterns as close to omni >as possible. I will also have to side mount a 224 Mhz collinear and I >was wondering if the spacing will differ between the dipole style >antenna and the collinear styles. > >I used to have a pattern modeling program on a disc just for this type >of thing and it seems to be missing. > >Any comments are appreciated. > >John > > > Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
