3 ms·
Wonder what the noise floor is at those receivers ;)
by senatorobama 8y ago
Wonder what the noise floor is at those receivers ;)
- pgorczak 8y agoI found [1] which reports noise temperatures around 20–30 K for the 34 m antenna that receives Voyager data [2]. The equivalent noise spectral density is around -215 dB/Hz! [1] https://descanso.jpl.nasa.gov/monograph/series13/DeepCommo_Chapter2--141029.pdf https://descanso.jpl.nasa.gov/monograph/series13/DeepCommo_C... [2] https://voyager.jpl.nasa.gov/mission/science/ https://voyager.jpl.nasa.gov/mission/science/
- senatorobama 8y agoIs it possible to keep cooling so we can keep receiving data?
- madengr 8y agoCooling the LNAs on the earth station? Yes. I doubt the LNA on Voyager is actively cooled. I wonder if any feed components (prior to LNA) on the earth station are cooled? [1] does not indicate. Read a paper recently on converting an old NASA earth station with beam waveguide over to a wideband feed. They had to put a rigid waveguide horn on place of the waveguide and actively cool it.