It's 20 km in diameter, roughly. On 2/24/23 02:51, Ulrich Speidel via Starlink wrote: > > Did you mean to say 20 km diameter or 20 km^2 area? > > For those not familiar with RF engineering terms: A 3 dB contour as > Oleg shows it below in blue is the line where the power flux density > from the satellite drops to half of the value at the centre of the > beam. That's important as in RF engineering of cellular or beam > division networks, the minimum power you need to receive a signal > successfully can be several orders of magnitude larger than the amount > of power you need to cause interference to off-beam unintended > receivers. So in terms of their interference contour, beams are > actually much wider than just a cell or so, and a power flux density > half as high as at beam centre doesn't mean that it's the perimeter of > the beam as such - the beam will happily interfere with anyone up to a > few cells down the road at least. > > Incidentally, I'm seeing Dishy use more power when it's receiving at > higher rates, which is what you'd expect if its DSP is busy digging > out intended signals from unintended ones. > > On 24/02/2023 1:18 pm, Oleg Kutkov via Starlink wrote: >> >> Yes. The cell size is ~20 km >> >> On 2/24/23 02:08, David Lang wrote: >>> they can only narrow the radio beam so much (probably whatever their >>> cell size is). They can't change the footprint without changing the >>> antenna, so unless they have the beam move around in the cell, the >>> footprint should be slightly larger than the cell size >>> >>> sometimes there is a lot of data going to one station, but sometims >>> it's only going to be a trival amount (think ack packets for a lot >>> of uploads), so they can save airtime by using one timeslot to >>> transmit to many stations at once. >>> >>> David Lang >>> >>> On Fri, 24 Feb 2023, Oleg Kutkov via Starlink wrote: >>> >>>> Date: Fri, 24 Feb 2023 01:47:05 +0200 >>>> From: Oleg Kutkov via Starlink >>>> Reply-To: Oleg Kutkov >>>> To: starlink@lists.bufferbloat.net >>>> Subject: Re: [Starlink] System and method of providing a medium >>>> access control >>>>      scheduler >>>> >>>> Oh, that's interesting. >>>> >>>> >> the satellite broadcasts the downlink radio frame to all the >>>> user terminals in a group and they each retrieve their respective >>>> data from the downlink radio frame >>>> >>>> I thought the satellite beamformer only sends data frames to the >>>> appropriate UT. It looks like the given satellite covers the whole >>>> cell at one TX channel. >>>> Otherwise, it would be too complex, I guess. >>>> >>>> On 2/23/23 23:53, Dave Taht via Starlink wrote: >>>>> For those of you that don't look at patents, don't look at: >>>>> >>>>> https://patents.justia.com/patent/11540301 >>>>> >>>>> But I would welcome comment from those that do. >>>>> >>>>> H/T virtuallynathan. >>>>> >>>> >> -- >> Best regards, >> Oleg Kutkov >> >> _______________________________________________ >> Starlink mailing list >> Starlink@lists.bufferbloat.net >> https://lists.bufferbloat.net/listinfo/starlink >> > -- > **************************************************************** > 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/ > **************************************************************** > > > > > _______________________________________________ > Starlink mailing list > Starlink@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/starlink -- Best regards, Oleg Kutkov