L
| Launch vehicle | The rocket or launcher used to put a satellite in orbit. |
| LEO | Low-earth orbit of up to 800 km above the earth. This orbit is used by a constellation of satellites to provide a world wide mobile phone service. |
| Line amplifier | Amplifier used in a middle of a network to reamplify a signal. |
| LNB | Low Noise Block Amplifier/Converter: hardware device for converting and amplifying a band of satelllite signals from a high frequency (usually GHz) into lower IF-frequency(usually MHz). The LNB is mounted in the focal spot of a satellite dish. |
| Low Band | A band used for satellite transmission (from 10.70 GHz to 11.70 GHz). |
