Re: [Starlink] Starship's 4th flight test was magnificent

[David Lang <david@lang.hm>]

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Ulrich Speidel wrote:

> On 10/06/2024 2:38 pm, David Lang via Starlink wrote:
>> 
>> the V2 were about 8-10x the capacity of the V1.5 (the ones they could 
>> launch 50-60 per flight), the v2 mini they have been launching (~22/flight) 
>> are about midway between the two. No recent word on the V2s, but Tim Dodd 
>> did another starbase visit with Elon before the flight, so watch for that 
>> to show up soon.
>
> I think it'd be useful we could agree on what we mean by "capacity" before we 
> start throwing numbers around, especially relative ones. For Starlink, I can 
> think of the following capacities (yes, plural):
>
> * User up-/downlink capacity from/to a single user. (How many bits/s
>   can I throw at a Dishy?)
> * Downlink capacity to all users in a single cell (under the proviso
>   that we don't have any users in adjacent cells that need / want
>   service - think small island in the middle of the Pacific).
> * Overall user downlink capacity from a single satellite to multiple
>   cells. (Can't deploy co-frequency beams with identical polarisation
>   to the same cell if you have multiple such beams on your bird, but
>   can do so if we can aim them at different cells)
> * Gateway uplink capacity (to users served directly by the satellite
>   or indirectly via ISLs)
> * Gateway downlink (from users served directly by the satellite or
>   indirectly via ISLs)
> * Dto. per gateway (see co-frequency beam issue)
> * Processing capacity: Number of bits / s that a satellite can pump
>   between its receive beams / incoming ISLs and transmit beams /
>   outgoing ISLs.

I believe the numbers thrown around are for the total satellite capability, it's 
not per user or per cell and it includes the in-space laser links.

David Lang

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