The K factor accounts for refraction of radio waves close to the surface of the earth. For antenna towers less than a couple of thousand feet above the surface, a K factor of 1.33 is usually adequate for most line-of-sight calculations over average terrain.
Typical Values of K
Summer Winter
Dry mountains (above 1500 meters) 1.20 1.20
Mountains (to 1500 meters) 1.25 1.25
Midwest and Northeast 1.50 1.30
South and West Coast 1.55 1.35
Southern Coast 1.60 1.50
Enter the Total link distance (in Miles or Kilometers). If you do not enter
an Obstacle distance (in Miles or Kilometers) this calculator will use
the mid-point for all calculations (Note: assumes antennas at same height).
Enter the system Frequency in MHz and then click the 'Calculate' button. (1 GHz = 1000 MHz e.g. 2400 = 2.4 GHz)
The calculator will generate the radius of the 1st Fresnel zone only (at the obstacle point or
the mid-point), the 60% (no obstacle) radius and the height of the earth curvature at the mid-point
of the Total link distance.
Link Budget
