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Bad." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 24 Nov 2024 03:39:40 -0000 On 24/11/2024 9:05 am, Dave Taht wrote: >> 3. Elon will own the FCC. > This FCC promises to open up more spectrum. Where? I think it's not so much a matter of opening up spectrum. SpaceX's spectrum "reserve" at the moment is Ka-band. That's hitherto been used for gateways only, but with the lasers, that's becoming less of a bottleneck because you can in principle uplink from and downlink to a remote gateway or set of remote gateways (unlike with the end user - I mean Elon can't simply provide the service Dave's paying for over, say, New York, rather than where Dave's boat is). So that frees up a bit of resource to deploy directly to users in tight spots. Except that Dishy doesn't talk on Ka. The trouble with Ka is that it's a bit more susceptible to rain fade than Ku, and also that the amount of spectrum available there isn't exactly an order of magnitude larger either. To the contrary - the three Ka-bands in which SpaceX can downlink data have a combined 1.8 GHz of spectrum - less than for Ku. The pros of Ka are that the shorter wavelength makes for sharper beams and a nicer link budget with the same size antennas. As long as you don't get rained on. So you better throw in some extra antenna gain, which is what they're doing with the 1.85 m dishes (not Dishys) at their community gateways. But that's an entirely different business model. And yes I'm aware that there's some labelling issues as to what counts as Ka and what doesn't, internationally, and that the FCC's notion of Ka starts at lower frequencies than some other peoples'. -- **************************************************************** Dr. Ulrich Speidel School of Computer Science Room 303S.594 (City Campus) The University of Auckland u.speidel@auckland.ac.nz http://www.cs.auckland.ac.nz/~ulrich/ ****************************************************************