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*To*: starship-design@lists.uoregon.edu*Subject*: RE: starship-design: Massively Distributed Computing for SETI*From*: Zenon Kulpa <zkulpa@ippt.gov.pl>*Date*: Sun, 18 Mar 2001 18:01:41 +0100 (MET)*Reply-To*: Zenon Kulpa <zkulpa@ippt.gov.pl>*Sender*: owner-starship-design@lists.uoregon.edu

> From owner-starship-design@lists.uoregon.edu Sun Mar 18 17:16:34 2001 > From: "L. Parker" <lparker@cacaphony.net> > > > E.g., a 100-kilometer diameter microvawe dish > > tilted by only 1 mm (1/25th of an inch) at the edge, sweeps the beam > > at 1 ly distance by 100 000 (one HUNDRED thousand) kilometers! > > (i.e., almost one-third of the Earth-Moon distance) > > > > I am afraid that such deflections are easily obtainable > > by heat distortions of the structure or gravitational perturbation > > from an asteroid flying some million kilometers away... > > Well it is obvious from what you just presented that a dish is out of the > question. A phased array however is quite a different matter. > > Assuming that we are looking at a microwave beam as opposed to a laser, > then we would only have to electronically steer the beam to correct for > movement - as well as heat distortions, gravitational perturbations, etc., > which also implies some sort of feedback loop to measure such things. > Which seems also a quite nontrivial task, as the accuracies must be very high, and the phased array will probably have to be quite huge... -- Zenon Kulpa

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