NetStumbler.org Forums - View Single Post - Setting up wireless link from office to home

Thorn · 05-30-2004

If you only have 20 ft. above the highest obstacle, it probably won't work. The Fresnel Zone for 2.4 GHz at nine miles is 70.3 ft. The 60% is point of that (usually the lowest you want for clearance) is 42.2 ft.

At 2.4GHz, the minimum towers will be 133 feet at either end, and 161-foot tall towers would be best.

Even if you go up to 5.8GHz, the FZ is 45.2 ft. the and the 60% point is 27.1 ft. Here, the minimum you'd need is 118-foot towers at either end, and 136-foot tall towers would be best.

05-30-2004	#6 (permalink)
Thorn Did you do the math? Join Date: Apr 2002 Location: Villa Straylight Posts: 10,359	If you only have 20 ft. above the highest obstacle, it probably won't work. The Fresnel Zone for 2.4 GHz at nine miles is 70.3 ft. The 60% is point of that (usually the lowest you want for clearance) is 42.2 ft. At 2.4GHz, the minimum towers will be 133 feet at either end, and 161-foot tall towers would be best. Even if you go up to 5.8GHz, the FZ is 45.2 ft. the and the 60% point is 27.1 ft. Here, the minimum you'd need is 118-foot towers at either end, and 136-foot tall towers would be best. __________________ Thorn "Read Altas Shrugged. Compare it to today. Repeat as necessary"