How tall must the antennas be if the link operates on a frequency of 1450Mhz, D1=7miles, D2=11miles, and the obstruction is 85 feet high?
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Practice Problem Fresnel Zone Clearance
![1469_Fresnel Zone Clearance1.png](https://secure.tutorsglobe.com/CMSImages/1469_Fresnel%20Zone%20Clearance1.png)
How tall must the antennas be if the link operates on a frequency of 2.450Ghz, D1=5miles, D2=11miles, and the obstruction is 60 feet high?
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1. How tall must the antennas be if the link operates on a frequency of 900Mhz and the total distance is 12 miles? Heights are in feet above sea level and distance is in miles. HAASLHA = 550 feet, HAASLHB = 545 feet, HAASLOBS-4.5mi = 545 feet, HAASLOBS-9mi = 545 feet.
2. What is the minimum height of Ha if Hb has to be mounted 60' above the calculated level?
![1049_Fresnel Zone Clearance3.png](https://secure.tutorsglobe.com/CMSImages/1049_Fresnel%20Zone%20Clearance3.png)
1. How tall must the antennas be if the link operates on a frequency of 2.450Ghz and the total distance is 18 miles? Assume a 60' obstruction at each point of concern. Heights are in feet above sea level and distance is in miles. HAASLHA = 460', HAASLHB = 455', HAASLOBS-6mi = 480', HAASLOBS-10mi = 480'.
Obstruction at 6 miles Obstruction at 10 miles
2. How much must HB increase if HA is limited to 2/3 of the equal tower height solution?
3. How must Ha and HB change to adjust for the terrain HAASL?