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<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"><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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