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<p>Ham radio (if we're talking shortwave HF here) is easily jammed
due to the lack of directionality of the antennas in use (a
consequence of the large wavelengths, which are between about 6
and 160 m). That is, your receiver picks up signals from pretty
much anywhere with only a slight preference for the preferred
direction. This is different for Starlink, whose wavelengths are
below 3 cm, allowing for very compact and very directional
antennas.<br>
</p>
<p>Think of jamming as blinding someone who is trying to observe a
target that is transmitting light signals to them. If that someone
looks at the target with their eyes, it's easy to jam that as long
as you can hit the eyes from any direction. If they are looking at
the target with binoculars, you have to get in front of the
binoculars to have a chance to jam.</p>
<p>Amateur radio has been used for humanitarian relief for yonks,
and on some occasions also for a bit more than just that, although
that's frowned upon. But I don't think anyone would send radio
inspectors into Gaza right now, and I'm not sure that the ham
operators of the Arab world and elsewhere would necessarily desist
from passing on messages of all sorts.<br>
</p>
<div class="moz-cite-prefix">On 31/10/2023 1:54 am, Alexandre
Petrescu via Starlink wrote:<br>
</div>
<blockquote type="cite" cite="mid:63f3ec8b-289c-481e-9045-3b3ad3114fa9@gmail.com">
On the ham radio aspects: I thought ham radio use is restricted to
those <br>
who would not emit political oppinion, but rather talk about how
ham <br>
radio works.<br>
<br>
In such a context, nobody would forbid ham radio.<br>
<br>
Also, it is very easy to jam purposefully, but it is very hard to
<br>
identify when one is under purposeful jam (or maybe it does not <br>
propagate because other natural reasons). As such, it's hard to
make <br>
claims about when and what is jammed. These claims can only come
from <br>
those who actually jam. And then, it is hard to tell whether the
<br>
jamming was successful.<br>
<br>
About red cross and churches supporting those in need: it is a
good <br>
statement, but not universal. Both have some stories of not doing
so, <br>
in particular during WWII.<br>
<br>
For WWII jamming: radio equipment ('biscuits', among others; it's
the <br>
equivalent of DISHYs today) were used by Resistants in France.
One <br>
could go to prison for that use. German enemies would jam it at
times, <br>
and at other times they'd triangulate the position with
goniometers to <br>
find and punhish the emitter.<br>
<br>
More recently, during Cold War, there is so much more to be said
about <br>
jamming that an email is not enough :-)<br>
<br>
Alex<br>
<br>
Le 30/10/2023 à 06:56, Ulrich Speidel via Starlink a écrit :<br>
><br>
> The main problem as it stands with Gaza would be to get
Starlink <br>
> equipment in for the international organisations to use.
Coverage <br>
> wouldn't be an issue, but power and bandwidth would be.<br>
><br>
> It's a pretty dire situation. Palestinian friends of ours
have had <br>
> extended family killed, the wife's mother is currently
visiting here <br>
> and can't go back obviously - plus her apartment got
flattened in her <br>
> absence early on. Then our friend's teenage kids from his
previous <br>
> marriage got buried under rubble when their mother's place
got <br>
> flattened, and that was just up to last week. I really need
to ask him <br>
> what's happened since. They came here because they were sick
of Hamas.<br>
><br>
> On the ham radio side, I helped a bit with band watch for
MARS <br>
> (military affiliated amateur radio system) during the first
Gulf War <br>
> when the local US garrison (Old Ironsides) got sent from
Germany to <br>
> Saudi Arabia. A lot of them found out the hard way that if
you have a <br>
> bank account in Germany and you're on deployment, your
significant <br>
> other doesn't automatically get access to it like apparently
they do <br>
> in the US, and the army didn't exactly think that it was
their <br>
> problem, either. Got to listen to a lot of that. First world
problems <br>
> compared to Gaza, though.<br>
><br>
> On 30/10/2023 5:32 pm, Joe Hamelin via Starlink wrote:<br>
>> The US did shut down ham radio during WW2.<br>
>><br>
>> On Sun, Oct 29, 2023 at 9:27 AM Dave Taht via Starlink <br>
>> <a class="moz-txt-link-rfc2396E" href="mailto:starlink@lists.bufferbloat.net"><starlink@lists.bufferbloat.net></a> wrote:<br>
>><br>
>> I think that the internet should stay up, connecting
people to<br>
>> people,<br>
>> through all the conflicts we may ever have. The mails
kept running -<br>
>> although censored - all through world war two - the red
cross,<br>
>> allowed<br>
>> by all sides, to keep it's relief missions running, the
churches<br>
>> (mostly) doing their job to console the weary...<br>
>><br>
>> Many other orgs, like the ITU, and the IETF, are
committed to the<br>
>> continued free exchange of information, no matter what.<br>
>><br>
>> <a href="https://www.itu.int/en/about/Pages/default.aspx" moz-do-not-send="true">https://www.itu.int/en/about/Pages/default.aspx</a><br>
>><br>
>> I am happy to see a worldwide ISP committed to the same
principles.<br>
>><br>
>> On Sun, Oct 29, 2023 at 9:07 AM the keyboard of geoff
goodfellow via<br>
>> Starlink <a class="moz-txt-link-rfc2396E" href="mailto:starlink@lists.bufferbloat.net"><starlink@lists.bufferbloat.net></a> wrote:<br>
>> ><br>
>> > ➔➔<a href="https://twitter.com/dburbach/status/1718638348812595660" moz-do-not-send="true">https://twitter.com/dburbach/status/1718638348812595660</a><br>
>> ><br>
>> > --<br>
>> > <a class="moz-txt-link-abbreviated" href="mailto:Geoff.Goodfellow@iconia.com">Geoff.Goodfellow@iconia.com</a><br>
>> > living as The Truth is True<br>
>> ><br>
>> > _______________________________________________<br>
>> > Starlink mailing list<br>
>> > <a class="moz-txt-link-abbreviated" href="mailto:Starlink@lists.bufferbloat.net">Starlink@lists.bufferbloat.net</a><br>
>> > <a href="https://lists.bufferbloat.net/listinfo/starlink" moz-do-not-send="true">https://lists.bufferbloat.net/listinfo/starlink</a><br>
>><br>
>><br>
>><br>
>> -- <br>
>> Oct 30:<br>
>> <a href="https://netdevconf.info/0x17/news/the-maestro-and-the-music-bof.html" moz-do-not-send="true">https://netdevconf.info/0x17/news/the-maestro-and-the-music-bof.html</a><br>
>> Dave Täht CSO, LibreQos<br>
>> _______________________________________________<br>
>> Starlink mailing list<br>
>> <a class="moz-txt-link-abbreviated" href="mailto:Starlink@lists.bufferbloat.net">Starlink@lists.bufferbloat.net</a><br>
>> <a href="https://lists.bufferbloat.net/listinfo/starlink" moz-do-not-send="true">https://lists.bufferbloat.net/listinfo/starlink</a><br>
>><br>
>><br>
>><br>
>> -- <br>
>> --<br>
>> Joe Hamelin, W7COM, Tulalip, WA, 360-474-7474<br>
>><br>
>> _______________________________________________<br>
>> Starlink mailing list<br>
>> <a class="moz-txt-link-abbreviated" href="mailto:Starlink@lists.bufferbloat.net">Starlink@lists.bufferbloat.net</a><br>
>> <a href="https://lists.bufferbloat.net/listinfo/starlink" moz-do-not-send="true">https://lists.bufferbloat.net/listinfo/starlink</a><br>
>><br>
> -- <br>
>
****************************************************************<br>
> Dr. Ulrich Speidel<br>
><br>
> School of Computer Science<br>
><br>
> Room 303S.594 (City Campus)<br>
><br>
> The University of Auckland<br>
> <a class="moz-txt-link-abbreviated" href="mailto:u.speidel@auckland.ac.nz">u.speidel@auckland.ac.nz</a> <br>
> <a href="http://www.cs.auckland.ac.nz/~ulrich" moz-do-not-send="true">http://www.cs.auckland.ac.nz/~ulrich/</a><br>
>
****************************************************************<br>
><br>
><br>
><br>
><br>
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</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>
****************************************************************
</pre>
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