Re: [Starlink] Starlink "beam spread"

[Mike Puchol <mike@starlink.sx>]

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On this particular one, the gateway beams are extremely narrow, around 1.5º to 2.5º. SpaceX is working on “mega-gateways” where 32 antennas will co-exist. They are also deploying a new gateway design with a larger antenna, and thus narrower beamwidth and more gain, allowing for a considerable reduction in TX power.

Best,

Mike
On Aug 31, 2022, 09:33 +0200, David Lang via Starlink <starlink@lists.bufferbloat.net>, wrote:
> On Wed, 31 Aug 2022, Ulrich Speidel via Starlink wrote:
>
> > This combines with the uncomfortable truth
> > that an RF "beam" from a satellite isn't as selective as a laser beam,
> > so the options for frequency re-use from orbit aren't anywhere near as
> > good as from a mobile base station across the road: Any beam pointed at
> > you can be heard for many miles around and therefore no other user can
> > re-use that frequency (with the same burst slot etc.).
>
> not quite, you are forgetting that the antennas on the ground are also steerable
> arrays and so they can focus their 'receiving beam' at different satellites.
> This is less efficient than a transmitting beam as the satellites you aren't
> 'pointed' at will increase your noise floor, but it does allow the same
> frequency to be used for multiple satellites into the same area at the same
> time.
>
> David Lang
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