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3

It seems to me they made it as open as they could and still have it work, but that's probably not quite open enough to gather the signal on your own without some significant effort. The best source I've found on the signal itself is Juno Telecommunications (2012), with "Detecting Juno's ‘Heartbeat’" (2020) as runner-up, and Juno Raw Data (Level 0) ...


2

Very-Long Baseline Interferometry is interferometry with telescopes that physically distant. The observation data is recorded locally, and post-observation the data is combined at a central location to produce the measurement result. In order to do the combination post-observation, you need a common reference. They use very accurate atomic clocks for this, ...


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