[BC] FM bays

[Bob Groome]

As you are doing a slight reach pattern, the 6 bays would be better. If you are going in a single direction for your target, a face mount might be better than a leg or pole mount. If you want to see some typical patterns go to: 

http://www.eriantennas.com/AntennaCalculator/FMCalca.htm

And on the left hand part of the screen, choose horizontal patterns; look for something near your frequency and tower size. Those in the right side of the list are GIF (image) and on the left are FIG (tabulations and pattern) The FIG requires the free viewer program also on this same page. You can extract the tabulations for use with any of the Longly-Rice programs to really let you get a better estimate of what to expect in the real world.

On the other hand, if you are wanting as omni as possible, consider mounting on a Lambda™ tuned tower section. See:

http://www.eriinc.com/pubs/080402009-W.pdf

Gives a quick over-view of the nifty advantages of making the tower look invisible as far as the H-Poll azimuth pattern is concerned. And you could opt for full scale pattern optimzation so you will know exactly what direction the signal will go and correct for any V-Poll attenuation on the back of the tower/pole.

Hope this helps in your panning,

Bob Groome

In any moment of decision, the best thing you can do is the right thing, the next best thing is the wrong thing and the worst thing you do is nothing .... Theodore Roosevelt

Personal Web Site is: http://web.mac.com/bobgroome/index.htm

Work E-mail is: bgroome at eriinc.com

--- On Wed, 2/11/09, Mglin at aol.com <Mglin at aol.com> wrote:

> From: Mglin at aol.com <Mglin at aol.com>
> Well some of you know the best answer
> for this.  Your help is  appreciated.
>  
> Here is the question.  I am upgrading my FM 
> C3  25 KW  ERP  245'AGL, moving 
> to 328' AGL
> Currently using OMB 6 bay with 9.5 KW TPO.  Bays are
> .75 spaced