7E Communications
   

Glossary Terms Beginning O

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Occasional capacity; Occasional use
Capacity available for ad hoc bookings.
Occupied bandwidth
Absolute bandwidth occupied by the signal within a transponder or allocated channel.
Offset prime focus
Type of parabolic antenna where the focus of the antenna is displaced: instead of being at the centre of the parabola (the 'vertex') the focus is shifted up.
OMT
Orthogonal mode transducer.
On-axis
In line with the main beam of an antenna.
Orbital period
Time taken for a satellite to go through one complete orbit.
Orthogonal mode transducer
OMT: multi-port microwave device that allows the transmission of signals on one polarization while receiving signals on the opposite polarization.
Oscilloscope
Electronic instrument for viewing and measuring electrical and electronic signals.
Outage
Failure of satellite link.