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Undid revision 590786665 by Incnis Mrsi (talk) false alarm (dash is correct); -{{Confusing}}; tweaks;

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The '''Egli Model''' is a terrain model for [[Radio propagation model|radio frequency propagation]]. This model, which was first introduced by John Egli in his 1957 paper,<ref name="Egli-rp">{{cite journal|doi=10.1109/JRPROC.1957.278224|last=Egli|first=John J.|date=Oct. 1957|title=Radio Propagation above 40 MC over Irregular Terrain|journal=Proceedings of the IRE|publisher=IEEE|volume=45|issue=10|pages=1383–1391|issn=0096-8390}}</ref> was derived from real-world data on UHF and VHF television transmissions in several large cities. It predicts the total [[path loss]] for a [[Point-to-point (telecommunications)|point-to-point]] link. Typically used for outdoor [[Line-of-sight propagation|line-of-sight]] transmission, this model provides the path loss as a single quantity.

==Applicable to/under conditions==

The Egli model is typically suitable for cellular communication scenarios where one antenna is fixed and another is mobile. The model is applicable to scenarios where the transmission has to go over an irregular terrain. However, the model does not take into account travel through some vegetative obstruction, such as trees or shrubbery.

==Coverage==

Frequency: The model is typically applied to [[VHF]] and [[UHF]] spectrum transmissions.

==Mathematical formulation==

The Egli model is formally expressed as:

<math>P_{R50} = 0.668 G_B G_M \big[\frac{h_B h_M}{d^2}\big] ^2 [{\frac{40} {f}}]^2 P_T</math>

Where,

<math>P_{R50}</math> = 50th percentile receive power [W]

<math>P_T</math> = Transmit power [W]

<math>G_B</math> = Absolute [[gain]] of the [[base station]] [[Antenna (radio)|antenna]].

<math>G_M</math> = Absolute gain of the [[mobile station]] antenna.

<math>h_B</math> = Height of the base station antenna. [m]

<math>h_M</math> = Height of the mobile station antenna. [m]

<math>d</math> = Distance from base station antenna. [m]

<math>f</math> = [[Frequency]] of transmission. [MHz]

==Limitations==

This model predicts the path loss as a whole and does not subdivide the loss into free space loss and other losses.

==Further reading==

''Introduction to RF propagation,'' John S. Seybold, 2005, John Willey and Sons Inc.

==References==

<references/>

==See also==

[[Longley-Rice Model]]

[[ITU Terrain Model]]

[[ITU|International telecommunication union]]

[[Category:Radio frequency propagation]]

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en>Incnis Mrsi: Undid revision 590786665 by Incnis Mrsi (talk) false alarm (dash is correct); -{{Confusing}}; tweaks;