@JD-EE
I believe it's been established there is no dish. They use Inmarsat as their carrier. And the antenna is omnidirectional for this mode
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Believe what U want
For antenna control steering and computed doppler correction, the following ARINC 429 octal labels are transmitted from the ADIRU to the SDU:
310 Present position - Latitude
311 Present position - Longitude
312 Ground speed
313 Track angle
314 True heading
324 Pitch angle
325 Roll angle
361 Inertial altitude
This is required for:
The high gain antenna is an electronically steerable phased array. Simultaneous transmission and reception of satellite signals (full duplex operation) provides two bands of operation: receive (Rx) band, and transmit (Tx) band.
Beam steering of the antenna is performed via serial transmission of phase shifter data from the BSU. RF signals are transmitted to and received from the D/LNA unit.
The high gain antenna provides +12dBic nominal gain with near hemispherical coverage and enables transmission of high rate data and voice communications.
But U can ask me every time 