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<p>Getting the satellite density up will help, but it will only
improve things so far.</p>
<p>The problem on user downlink in particular is that there's a
limit on the maximum spectral power flux density that arrives from
the satellite in space on the ground. If you point all (mutually
compatible) user downlink beams from a single satellite at a
single cell, you all but reach that limit there. In fact, where
SpaceX want to use two beams on the same frequency but with
opposite polarisations to the same cell, they must reduce the
transmit power on each beam by 3 dB (50%) in order to stay within
the limit. More satellites would give you more beams, but you
can't point them at cells that already have a beam on the same
frequency in use from another satellite (unless you de-rate on the
power front, I guess). That seriously limits what you can receive
in terms of total capacity within a single cell to what a single
satellite's mutually compatible beams can deliver, which appears
to be about 12 Gb/s on V1 and V1.5 birds, and 20 Gb/s on V2 (on
Ku, if you add in Ka-band and anticipate Dishys that can do Ka,
then it's a lot more for Ka). In practice, we know that a cell
gets served by beams from different satellites, but the overall
constraint still applies - if you deploy beam X from sat A and
beam Y from sat B to the same cell, this makes the same
contribution to PFD as deploying both from the same satellite.
Note that Starlink sats do have multiple mutually incompatible
beams that they can only point at different cells, bringing Ku
user downlink capacity up to 16 Gb/s on V1 and 1.5, and 48 Gb/s on
V2. But that only ups your chances of getting a larger slice of
those 12 or 20 Gb/s in your cell.<br>
</p>
<p>Your best bet for continuing good service at the moment is
literally to tell your neighbours that Starlink is useless, so
they don't sign up and you can have your cake all to yourself ;-)<br>
</p>
<div class="moz-cite-prefix">On 3/06/2024 5:13 am, Dave Taht via
Starlink wrote:<br>
</div>
<blockquote type="cite" cite="mid:CAA93jw5V0JTEgTyn4iuXfrHLNxnKyWDWeZKj_Ao=8OCY_R4fYg@mail.gmail.com">
<div dir="ltr">
<div><span style="color:rgb(15,20,25);font-family:TwitterChirp,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;font-size:17px">Via
elon musk:</span></div>
<div><span style="color:rgb(15,20,25);font-family:TwitterChirp,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;font-size:17px"><br>
</span></div>
<div><span style="color:rgb(15,20,25);font-family:TwitterChirp,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;font-size:17px">Starlink
just achieved a new internal median latency record of 28ms
yesterday!
Great work by the engineering and operations teams.</span><br>
</div>
<div><br>
</div>
- <a href="https://twitter.com/elonmusk/status/1797282250574184587" moz-do-not-send="true" class="moz-txt-link-freetext">https://twitter.com/elonmusk/status/1797282250574184587</a>
<div><br>
</div>
<div>I of course, am very interested in y'all´s external
measurements of how well starlink is doing. For me, it is
fantastic - 30Mbit uploads nowadays, 0</div>
<div>latency on the upload (how?) <a href="https://www.waveform.com/tools/bufferbloat?test-id=2a1d139b-87cb-4ba4-a829-e2167801cffe" moz-do-not-send="true" class="moz-txt-link-freetext">https://www.waveform.com/tools/bufferbloat?test-id=2a1d139b-87cb-4ba4-a829-e2167801cffe</a></div>
<div><br>
</div>
<div>I also keep hoping that the rest of the ISP industry is now
paying attention and deploying stuff like fq_codel and cake
and libreqos, but, ah well - I will settle for starlink
blowing past a lot of dsl and cable and finding ways to get
their density up.</div>
<div><br>
</div>
<div>Anyone going to the Starship launch on the 6th?</div>
<div><br>
</div>
<div><br clear="all">
<div><br>
</div>
<span class="gmail_signature_prefix">-- </span><br>
<div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature">
<div dir="ltr">
<div><a href="https://www.youtube.com/watch?v=BVFWSyMp3xg&t=1098s" target="_blank" moz-do-not-send="true">https://www.youtube.com/watch?v=BVFWSyMp3xg&t=1098s</a>
Waves Podcast<br>
</div>
<div>Dave Täht CSO, LibreQos<br>
</div>
</div>
</div>
</div>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
Starlink mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Starlink@lists.bufferbloat.net">Starlink@lists.bufferbloat.net</a>
<a class="moz-txt-link-freetext" href="https://lists.bufferbloat.net/listinfo/starlink">https://lists.bufferbloat.net/listinfo/starlink</a>
</pre>
</blockquote>
<pre class="moz-signature" cols="72">--
****************************************************************
Dr. Ulrich Speidel
School of Computer Science
Room 303S.594 (City Campus)
The University of Auckland
<a class="moz-txt-link-abbreviated" href="mailto:u.speidel@auckland.ac.nz">u.speidel@auckland.ac.nz</a>
<a class="moz-txt-link-freetext" href="http://www.cs.auckland.ac.nz/~ulrich/">http://www.cs.auckland.ac.nz/~ulrich/</a>
****************************************************************
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