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Convention: a negative value corresponds to a downward tilt and a positive value to a upward tilt.

General rule

In far field (case of a single dipole per antenna), if the key tilt is not the same than the model tilt, the difference between the key value and the model tilt is added to the mechanic tilt.

The Electric tilt value set in the interface is the one used for simulation, even if the model tilt is different. A best practice is to use a model having a tilt equal (or closest) to the target one.

MithraREM allows to set an antenna variant.

The electric tilt management differs according to the antenna model / pattern used.

Antenna model with an electric tilt

When using an antenna with an integrated tilt (tilted antenna model), the value of the Electric tilt corresponds to the electric tilt of the model. When selecting an antenna model, this value is displayed in the Model electric tilt field, inside the Antenna model parameter box.

In this case, don't modify the electric tilt found by the software in the model even if a mechanic tilt will be applied.

How is calculated the electric tilt value of the antenna model?

The value of the Electric tilt visible in the software corresponds to the value of maximum vertical gain.

MithraREM can calculate an electric tilt which is different from the real value of the model. Example: for an antenna with an electric tilt of -4°, MithraREM find -3°. It means that the maximum vertical gain of the MSI file is lower (or at least equal) at -3°. If you want a simulation with -4° (the real tilt of the model), don't change the value of the tilt automatically find by MithraREM. Changing the value will rotate the pattern.

Antenna model without an electric tilt

When using a n antenna model not tilted, set the field Electric tilt with the wanted value corresponds to apply a mechanic tilt to this model.

Some examples:

•For a directional antenna with a pattern tilted at -5°, if -4° is set in the interface, the model will be rotated upward of 1° (like a mechanic tilt).

•For omnidirectional antennas, change the electric tilt value is a nonsense because this corresponds to an inclination as for a mechanic tilt.

To conclude, if an antenna model is already tilted or for an omnidirectional antenna, do not change the electric tilt value to avoid a rotation of the pattern.