From: David Lang <david@lang.hm>
To: Ulrich Speidel <u.speidel@auckland.ac.nz>
Cc: Sebastian Moeller <moeller0@gmx.de>,
Ulrich Speidel via Starlink <starlink@lists.bufferbloat.net>
Subject: Re: [Starlink] Starlink "beam spread"
Date: Wed, 31 Aug 2022 00:33:16 -0700 (PDT) [thread overview]
Message-ID: <8978587-42op-q175-2o41-qq9p4491459s@ynat.uz> (raw)
In-Reply-To: <2321be3b-957f-2d1f-c335-119c8e76efe5@auckland.ac.nz>
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
next prev parent reply other threads:[~2022-08-31 7:33 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.3.1661875202.32670.starlink@lists.bufferbloat.net>
2022-08-30 16:53 ` David P. Reed
2022-08-30 17:32 ` Doc Searls
2022-08-30 20:09 ` Mike Puchol
2022-08-30 20:35 ` Daniel AJ Sokolov
2022-08-30 20:40 ` Mike Puchol
2022-08-30 21:09 ` David Lang
2022-08-30 21:01 ` David Lang
2022-08-30 22:07 ` Brandon Butterworth
2022-08-30 22:21 ` David Lang
2022-08-30 22:37 ` Brandon Butterworth
2022-08-30 23:07 ` David Lang
2022-08-30 23:45 ` Brandon Butterworth
2022-08-30 23:28 ` David P. Reed
2022-08-31 0:12 ` David Lang
2022-08-31 0:31 ` Dave Taht
2022-08-31 0:32 ` David P. Reed
2022-08-31 10:29 ` Dave Collier-Brown
2022-08-31 18:51 ` David Lang
2022-08-31 19:04 ` Dave Taht
2022-08-30 22:50 ` Ulrich Speidel
2022-08-30 23:13 ` David Lang
2022-08-31 0:46 ` tom
2022-08-31 0:58 ` Dave Taht
2022-08-31 7:36 ` Mike Puchol
2022-08-31 6:26 ` Sebastian Moeller
2022-08-31 7:25 ` Ulrich Speidel
2022-08-31 7:31 ` Hayden Simon
2022-08-31 7:33 ` David Lang [this message]
2022-08-31 9:59 ` Mike Puchol
2022-08-31 10:06 ` David Lang
2022-08-31 10:12 ` Mike Puchol
2022-08-31 17:52 ` Dick Roy
2022-08-31 13:41 ` Ulrich Speidel
2022-08-31 14:30 ` Mike Puchol
2022-08-31 21:44 ` Ulrich Speidel
2022-09-01 7:58 ` Sebastian Moeller
2022-09-01 11:38 ` Ulrich Speidel
2022-09-01 19:54 ` Michael Richardson
2022-09-01 21:08 ` tom
2022-09-02 7:52 ` Sebastian Moeller
2022-09-02 12:29 ` tom
2022-08-31 7:49 ` Sebastian Moeller
2022-08-31 9:25 ` Brandon Butterworth
2022-08-31 9:34 ` David Lang
2022-09-01 9:12 ` Brandon Butterworth
2022-08-31 14:52 ` Dave Taht
2022-08-31 15:22 ` [Starlink] starlink upload behavior Dave Taht
2022-09-01 19:24 ` Luis A. Cornejo
2022-09-01 19:50 ` Dave Taht
2022-08-31 8:15 [Starlink] Starlink "beam spread" David Fernández
2022-08-31 14:51 David Fernández
2022-08-31 18:09 ` Michael Richardson
2022-08-31 21:46 ` Ulrich Speidel
2022-08-31 23:44 ` Lin Han
2022-09-01 19:26 ` Dave Taht
[not found] <mailman.800.1661972667.1281.starlink@lists.bufferbloat.net>
2022-08-31 19:51 ` David P. Reed
2022-08-31 20:28 ` David Lang
2022-08-31 21:17 ` David P. Reed
2022-08-31 21:33 ` David Lang
2022-09-01 7:05 ` Mike Puchol
2022-09-01 11:43 ` Ulrich Speidel
2022-09-01 8:09 ` David Lang
2022-09-01 15:19 David Fernández
2022-09-01 16:33 ` Darrell Budic
2022-09-02 9:32 ` David Fernández
2022-09-01 19:56 ` Michael Richardson
2022-09-02 12:27 ` Sebastian Moeller
2022-09-02 18:34 ` Michael Richardson
2022-09-02 20:11 ` Sebastian Moeller
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