[Starlink] Starlink "beam spread"

[David Lang]

I was actually referring to the possibility that the home dishy could point at 
different satellites, so you could have multiple satellites pointing at a given 
cell on the same frequency, and the dishy can aim it's beam to pick which one to 
hear as well as which one to transmit to.

David Lang

On Wed, 31 Aug 2022, Mike Puchol via Starlink wrote:

> 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 at 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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>
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