https://en.wikipedia.org/wiki/Fata_Morgana_(mirage)
From: Bill Prince Sent: Friday, June 10, 2016 5:22 PM To: [email protected] Subject: Re: [AFMUG] Downtilt Calculator My porch is at 2450' overlooking the Pacific Ocean. I think I can see close to 80 miles. bp <part15sbs{at}gmail{dot}com> On 6/10/2016 3:02 PM, George Skorup wrote: You must be related to Sarah Palin. Low blow. I know. Sorry. :) On 6/10/2016 4:57 PM, Bill Prince wrote: Sitting on my front porch. I can see over 40 miles to the horizon. bp <part15sbs{at}gmail{dot}com> On 6/10/2016 2:36 PM, Ken Hohhof wrote: But from eye level, the horizon is only about 3 miles away. � Then there�s K-factor to consider (bending of microwave path by atmosphere). � From: Bill Prince Sent: Friday, June 10, 2016 4:29 PM To: [email protected] Subject: Re: [AFMUG] Downtilt Calculator � I believe that out to 15 miles or so you can treat the earth as "close" to flat. No, it's not flat, but the difference is not worth talking about. Beyond that, and you have to take earth curvature into account. � bp <part15sbs{at}gmail{dot}com> On 6/10/2016 2:05 PM, Ken Hohhof wrote: So you are a flat earth believer? � From: [email protected] Sent: Friday, June 10, 2016 1:12 PM To: [email protected] Subject: Re: [AFMUG] Downtilt Calculator � Seriously, take the height of the antenna divided by the distance to the area you want to focus the energy.� � If that is one mile away, and the antenna is mounted at 100 feet, 100/5280.� = .189 � Hit the ARCTAN button or the inverse TAN button and we get 1 degree of downtilt.� � TAN = Rise over Run.� Arctan = degrees of Rise/Run � To me that is easier and quicker than going on line and finding a calculator web page etc.� With an HP calculator it is 3 key strokes in addition to the numbers.� � From: [email protected] Sent: Friday, June 10, 2016 12:03 PM To: [email protected] Subject: Re: [AFMUG] Downtilt Calculator � <snark> � Look for a button called TAN on your calculator. � </snark> � From: Brandon Yuchasz Sent: Friday, June 10, 2016 11:37 AM To: [email protected] Subject: [AFMUG] Downtilt Calculator � Looking for a very simple down tilt calculation tool and I am wondering what most of you guys are using. There has to be an easier way then using math and my brain every time. � � Best regards, Brandon Yuchasz GogebicRange.net www.gogebicrange.net �
