I'm sorry Joe but Dean is correct. I believe you might be forgetting about the angle of radiation off the antenna and the null zones it creates. Higher gains create larger near field null zones so you have to pick a gain that gives good coverage but won't exclude mobiles that are near the site.
The other factor that you have to take into consideration is the elevation that the flag pole is going to be erected at. Now add to that the flag poles are smaller in foot print diameter than normal cell phone towers which places the antennas inside them in closer proximity to each other and you have to minimize interaction with each other. Using high gain antenna's causes more problems with interaction so you have to reach a happy medium. Sorry to say Trig is one thing but real world RF is another. I have worked in the RF field almost as long as Dean and have seen many strange things happen. Mike K1EG ----- Original Message ----- From: "Joe Montierth" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Tuesday, March 08, 2005 10:22 AM Subject: Re: [Repeater-Builder] Inside a Flag pole Tower > > > --- [EMAIL PROTECTED] wrote: > > 1st off that was not a put down! > > I will not blow my on horn but > > I can say if it works for you then > > use it. BUT! It is not how antenna > > physics work. Just think how much > > better a system will work when we do > > not try to change the laws and rules > > of antenna physics? > > Dean Westbrook, EE,PE > > > > Then don't try to change the laws of trigonometry > either. > > 100ft tower, 40 miles out, what's the angle? For that > matter, figure at 5 and ten miles also. > > At those short antenna heights you will usually want > the maximum gain, unless your prime coverage is in the > first half mile or so. > > Joe > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > > > > > > Yahoo! Groups Links > > > > > > > > > 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/
