LNA
Pronunciation: L-N-A
Also written as: LNA — Low-Noise Amplifier
A receive-chain amplifier mounted close to the ground station antenna feed that boosts weak incoming satellite signals while adding minimal noise. A key contributor to the system's G/T figure.
Full Definition
The LNA is the first active component in the receive signal chain, positioned as close as possible to the antenna feed to minimise the noise figure contribution of subsequent components. By amplifying the satellite signal before it travels through cables to indoor equipment, the LNA preserves the signal-to-noise ratio of the receive system. The LNA's noise temperature (measured in Kelvin) is a primary factor in calculating the system's overall G/T figure of merit. Editors should note that LNA is always capitalised and is distinct from the LNB (Low-Noise Block Downconverter), which combines amplification and frequency downconversion in a single unit typically found in consumer installations.
Usage
Usage note: Expand on first use: 'Low-Noise Amplifier (LNA)'. Do not conflate with LNB; LNAs are professional earth station components, while LNBs are typically consumer-grade units combining amplification and frequency conversion.
In Context
- "The ground station's receive system employed a cryogenically cooled LNA with a noise temperature of 20 K." — System Performance Specification
- "When editing equipment lists, verify that 'LNA' and 'LNB' are not used interchangeably, as they refer to different device types." — Editorial Style Note