That sounds about right to me Nate. I have a repeater with a low antenna (abt 65 ft) in the flatland around the Dallas area that does about 12 miles, so not a bad rule of thumb for that low antenna. But I also have a repeater with an antenna at about 300 ft in that area that does a lot better than the 27 or so miles the rule of thumb would suggest. More like about 35 miles to the best of my knowledge. So maybe the rule does not work all the time - (or the tower is taller than I think it is)
73 - Jim W5ZIT -----Original Message----- From: [EMAIL PROTECTED] To: [email protected] Sent: Mon, 26 Mar 2007 3:12 PM Subject: Re: [Repeater-Builder] Distance On 3/25/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > > > as far as range goes...... take the square root of the distance from the ground to the base of your antenna and multiply it by 1.5 and that would be your range.... higher mo better.... allen.... In what units, Allen? Didn't you have an obnoxious math or physics teacher holler at you about providing the proper units (or deriving them) for a particular problem in school? Distance from the ground to base of antenna in ... Feet? Inches? Miles? (that last one's a joke... but I can do it with a couple of repeaters here, if you count the mountain they're sitting on...) That will be your range in what... miles? Kilometers? Inches? Astronomical Units? Need to be a little more specific there to help him out... I did some fast numbers to try to figure out how your rule of thumb works... I decided to try the "tower" hight in feet... Assuming... A 5000' tower (mountain)... that gives a number of unknown units of 70.7106781. Multiply that by 1.5, you get... 106.06601715. So ... assuming the height WAS supposed to be given in feet, it would appear to me that the "answer" is in miles? 106 miles of coverage is the only thing even close to being in the ballpark for one of our mountaintop systems. I can tell the answer's not in Feet or AU's! (GRIN) Nate WY0X ________________________________________________________________________ Check Out the new free AIM(R) Mail -- 2 GB of storage and industry-leading spam and email virus protection.
