Robert, >From the DB Products catalog using Omnidirectional antennas side mounted the >spacing for a particilar pattern is determined by 3 issues; the tower face >(space between legs), the distance from the tower and the band/frequency.
If you give me direct e-mail I can scan the one page that gives the patterns for 160, 460 and 800 Mhz. As an example a side mounted antenna on 160 MHz 1/4 wavelenght on a 41 inch face the pattern is pretty much omni with a slight null on the opposite side of the tower. For 12 & 18 inch face about the same. At 1/2 wave length for 12 and 18" tower face the pattern starts to become more 3 directional and for 41" 2 sided directional east and west of a north mounted antenna. No equation is given and this info is from actual patterns using half-wave dipoles such as the DB224. However, the DB224 pattern can be changed by moving the dipoles arround its mast or mounting on different legs of the tower. When on different legs, however, the antennas start to work independly and not phased. Let me know if you want the diagrams, 1 page. 73, ron, n9ee/r >From: georgiaskywarn <[EMAIL PROTECTED]> >Date: 2007/07/16 Mon AM 08:25:39 CDT >To: [email protected] >Subject: [Repeater-Builder] Sidemount dos program > >I am looking for a program, that I had one time, that would give what >it thought would be the best guess on how far an antenna should be out >from a tower (on certain freq). I don't think it was tplot program. >I can remember using this and it gave me a range of distances and such >from the tower. > >Am I dreaming...or is there a program out there like that. It has >been years ago...but I thought I used this on the old tower we were on. >Thanks, >Robert > > Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
