Finally enter the system Frequency in MHz and then click the 'Calculate' button. Fresnel and his theories.Įnter the Total link distance (in Miles or Kilometers), if you do not enter an Obstacle distance (in Miles or Kilometers) the calculator will use the mid-point for all calculations ( Note: assumes antennas at same height). Frequencyĭefines how much clearance you need (yes you need more than simple Line-of-Sight) and for longer links > 3 Km (2 miles) whether you may have a ground clearance problem from our friendly planet. This a very idealised calculation and in practice everything interferes with the signal but it will give you a reasonable approximation of the actual loss over distance.Įnter the system Frequency in MHz and the distance in either Kilometers (Km) or Miles below and then click the 'Calculate' button. Loss of power over distance (assuming no FRESNEL Effect and nothing in the way). Just leave the line blank if you are feeling lazy. Note: Connector loss is generally small UNLESS you've got lots of 'em in which case you are probably in trouble anyway, or your cable is VERY short. Up to 2 decimal places may be entered as 0.xx or.
MINUS cables and connectors losses (B above)Įnter one parameter in each column (or leave blank) depending on what you know and the calculator will supply the appropriate conversions automatically.The 'Power Budget' is the the total power being output from the wireless system and is the sum of: Use this calculator to walk through all the factors that make up your Power Budget.
With suitable apologies to the memory of the late, lamented, Douglas Noel Adams the answer to the question of 'how far will this wireless transmission go?' is 42. Use this link for our quick overview of the background to radio propagation and the side-bar links for some 'real brain-hurting stuff'. These calculators use standard algorithms which give reasonable results BUT it should be borne in mind you can have two locations 1 meter apart in which one gets great reception ALL the time and the other NEVER gets reception. Serious Health Warning: It is nothing short of a minor miracle of physics that ANY wireless signal gets to its destination.
#5GHZ CANTENNA CALCULATOR FREE#
And the moral of this tale - get a decent browser.
Those of you using Gecko/Moz based browsers (for example Firefox) had the right answer all the time. Partial Groveling apology 3: The Fresnel calculator incorrectly computed the 60% obstacle free zone for MSIE browsers. Thanks to Ranjan Sonalkar for pointing out the error. Previous calculations used the earth's radius and were higher by ~30%. However the ATIS Committe T1A1 recommends use of the effective earth radius (4/3 * earth radius). Groveling apology 2: The Fresnel calculator provides the earth's height at the mid-point. Thanks to Phil Wells for pointing out the errors. More importantly the 60% rule-of-thumb distance was incorrect on the pessimistic side. Groveling apology 1: The Fresnel calculator said it would default to the mid-point if no obstacle distance was specified and it didn't. For the equations used in each calculator follow the Calculations and equations used link.
#5GHZ CANTENNA CALCULATOR CODE#
If you don't like 'em or think you can improve 'em, the code for the calculators is here. Find the calculation you want, and enter the various parameters required then click the 'Calculate' button. These calculators are written in Javascript (saves our bandwidth).