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MAY 2015 LINE OF SIGHT

Learn how to calculate line of sight between antennas using the formula. Line of sight is crucial for VHF and UHF radio transmissions to ensure clear communication. Discover the significance of antenna height and ground elevation in determining the line of sight distance.

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MAY 2015 LINE OF SIGHT

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  1. MAY 2015LINE OF SIGHT

  2. Line of sight: An imaginary line that exists between two objects.

  3. VHF and UHF radio transmissions usually require a clear path between antennas known as the line of sight.

  4. FORMULA: Line of sight in miles = SQRT (2 * total height of Antenna 1) + SQRT (2 * total height of Antenna 2)

  5. Total height of the antenna = Ground elevation at the base of the antenna + Height of the antenna above the ground

  6. EXAMPLE Base of antenna 1 = 1250 feet Height of antenna 1 above ground = 40 feet Total height of antenna 1 = 1290 feet Base of antenna 2 = 2857 feet Height of antenna 2 above ground = 40 feet Total height of antenna 2 = 2897 feet

  7. Total height of antenna 1 = 1290 feet 1290 times 2 = 2580 Total height of antenna 2 = 2897 feet 2897 times 2 = 5794 Square Root of 2580 = 51 Square Root of 5794 = 76

  8. The line of sight between the two antennas is 51 + 76 = 127 miles

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