On Sat, Nov 05, 2005 at 09:23:05PM +0200, Juhana Sadeharju wrote: Normally 'diversity reception' means to combine the signals from 2 or more receivers to obtain a result that has a better S/N ratio (or less missing data) than either of the inputs. What the astronomers are doing is even more tricky. They combine signals from distant receivers not to get a better signal but to improve the angular resolution of the antenna, by 'synthesising' the effect of a very big one. It's called 'interferometry' and can get quite complicated. If both recordings are complete and have about the same quality, the best you can obtain is a 3 dB gain in S/N (for analog transmissions - for digital the picture is more complicated). -- FA