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<div class="moz-cite-prefix">And to make things even more
complicated Starlink also have to avoid emissions within a certain
angle towards O3b's satellites in MEO (relatively easy as they are
close to the geostationary arc) and to all its LEO competitors
with higher ITU priority which would be OneWeb, Telesat
Lightspeed, KLEO Connect and before all these a potential European
LEO constellation should it use Thales' ITU filings (MCSAT-2
LEO-x) - see
<a class="moz-txt-link-freetext" href="https://www.itu.int/en/ITU-R/space/workshops/danang-2015/Documents/Presentations/Yvon%20Henri%20-%20NGSO%20Issues.pdf">https://www.itu.int/en/ITU-R/space/workshops/danang-2015/Documents/Presentations/Yvon%20Henri%20-%20NGSO%20Issues.pdf</a></div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">The more satellites these LEO
competitors deploy, the more in-line events will occur during
which Starlink will have to seize emissions - a so far
underestimated issue that could severely impair coverage and
service availability.<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Am 08.02.2022 um 11:11 schrieb Ulrich
Speidel:<br>
</div>
<blockquote type="cite"
cite="mid:bd881274-3ffe-d283-31d4-d1388b0bfa1c@cs.auckland.ac.nz">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p>That's an interesting aspect that I hadn't considered! A quick
back-of-the-envelope reveals that the GSO arc is at least 15
times beyond a Starlink LEO satellite, and with Friis
propagation, that's about 23 dB in terms of difference in path
loss, and thus not as much separation as you'd want. Under ITU
regs you're competing with noise, not signal ;-)</p>
<p>Either way, I know it's a contested topic even at the
regulatory level. <br>
</p>
<p>Tonga is at around 20 deg south so could be using anything from
north just over zenith to further south, but as I've pointed
out, there are other issues here also.<br>
</p>
<div class="moz-cite-prefix">On 8/02/2022 9:58 pm, Mike Puchol
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:07e8f287-3da1-4890-817f-4daf945c8d12@Spark">
<title></title>
<div name="messageBodySection">
<div dir="auto">The GSO satellite operators, due to the fact
that they have been there for eons, plus they cannot move
the satellites around, are at a disadvantage with NGSO
operators such as Starlink, when it comes to using the same
shared spectrum. The Ku band downlink spectrum Starlink uses
is the same as your satellite TV, thus, if your Dishy was
inline with a Starlink satellite and the line towards the
GSO arc, the satellite would kill all satellite TV in your
area.<br>
<br>
The ITU in its article 22 specifies how NGSO operators must
protect GSO operators, by not generating interference above
certain power levels to or from the GSO arc. For Dishy, this
means it cannot transmit anywhere between the GSO arc
elevation and +18° (up), -18° (down). <br>
<br>
In Barcelona, the GSO arc due South sits at around 43° in
elevation, thus, my Dishy cannot transmit between 25° and
61° in elevation due South. However, the protection band
begins around an azimuth of 120°, up to around 240°.<br>
<br>
In the Equator, the GSO protection band starts due East, and
goes all the way across the sky due West. It also takes out
37° of visible sky at zenith.<br>
<br>
Hope this helps!</div>
</div>
<div name="messageSignatureSection"><br>
Best,<br>
<br>
Mike</div>
<div name="messageReplySection">On Feb 8, 2022, 09:49 +0100,
Daniel AJ Sokolov <a class="moz-txt-link-rfc2396E"
href="mailto:daniel@sokolov.eu.org" moz-do-not-send="true"><daniel@sokolov.eu.org></a>,
wrote:<br>
<blockquote type="cite" style="border-left-color: grey;
border-left-width: thin; border-left-style: solid; margin:
5px 5px;padding-left: 10px;">On 2022-02-08 at 01:47, Mike
Puchol wrote:<br>
<blockquote type="cite">the biggest impact on Fiji and Tonga
is the GSO protection, which<br>
takes out 36° of usable sky, all the way from East to
West.<br>
</blockquote>
<br>
Ho Mike,<br>
<br>
would you please be so kind to explain that a bit more?<br>
<br>
Thank you<br>
Daniel<br>
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Dr. Ulrich Speidel
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The University of Auckland
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