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    <title>Pinboard (Vaguery)</title>
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    <description>recent bookmarks from Vaguery</description>
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  </channel><item rdf:about="http://arxiv.org/abs/1402.1215">
    <title>[1402.1215] Design for minimum energy in starship and interstellar communication</title>
    <dc:date>2015-01-06T11:03:46+00:00</dc:date>
    <link>http://arxiv.org/abs/1402.1215</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA[Microwave digital communication at interstellar distances applies to starship and extraterrestrial civilization (SETI and METI) communication. Large distances demand large transmitted power and/or large antennas, while the propagation is transparent over a wide bandwidth. Recognizing a fundamental tradeoff, reduced energy delivered to the receiver at the expense of wide bandwidth (the opposite of terrestrial objectives) is advantageous. Wide bandwidth also results in simpler design and implementation, allowing circumvention of dispersion and scattering arising in the interstellar medium and motion effects and obviating any related processing. The minimum energy delivered to the receiver per bit of information is determined by cosmic microwave background alone. By mapping a single bit onto a carrier burst, the Morse code invented for the telegraph in 1836 comes closer to this minimum energy than approaches used in modern terrestrial radio. Rather than the terrestrial approach of adding phases and amplitudes to increases information capacity while minimizing bandwidth, adding multiple time-frequency locations for carrier bursts increases capacity while minimizing energy per information bit. The resulting location code is extremely simple and yet can approach the minimum energy as bandwidth is expanded. It is consistent with easy discovery, since carrier bursts are energetic and straightforward modifications to post-detection pattern recognition can identify burst patterns. The interstellar coherence hole captures the time and frequency coherence constraints, and observations of the environment by transmitter and receiver constrain the burst parameters and limit the search scope.
]]></description>
<dc:subject>signal-processing space information-theory rather-interesting Fermi-paradox</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:Vaguery/b:c2c2cf33c47c/</dc:identifier>
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<item rdf:about="http://www.vfp62.com/SR-71.html">
    <title>Flying the SR-1 Blackbird</title>
    <dc:date>2010-04-08T11:20:26+00:00</dc:date>
    <link>http://www.vfp62.com/SR-71.html</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA["One moonless night, while flying a routine training mission over the Pacific, I wondered what the sky would look like from 84,000 feet if the cockpit lighting were dark. While heading home on a straight course, I slowly turned down all of the lighting, reducing the glare and revealing the night sky. Within seconds, I turned the lights back up, fearful that the jet would know and somehow punish me. But my desire to see the sky overruled my caution, I dimmed the lighting again. To my amazement, I saw a bright light outside my window. As my eyes adjusted to the view, I realized that the brilliance was the broad expanse of the Milky Way, now a gleaming stripe across the sky.…"
]]></description>
<dc:subject>flying aircraft history memory technology space</dc:subject>
<dc:identifier>https://pinboard.in/u:Vaguery/b:01bf65ca9381/</dc:identifier>
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<item rdf:about="http://www.wired.com/politics/security/news/2009/04/fleetcom?currentPage=2">
    <title>The Great Brazilian Sat-Hack Crackdown</title>
    <dc:date>2009-11-08T19:51:34+00:00</dc:date>
    <link>http://www.wired.com/politics/security/news/2009/04/fleetcom?currentPage=2</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA["To use the satellite, pirates typically take an ordinary ham radio transmitter, which operates in the 144- to 148-MHZ range, and add a frequency doubler cobbled from coils and a varactor diode. That lets the radio stretch into the lower end of FLTSATCOM's 292- to 317-MHz uplink range. All the gear can be bought near any truck stop for less than $500. Ads on specialized websites offer to perform the conversion for less than $100. Taught the ropes, even rough electricians can make Bolinha-ware.
"I saw it more than once in truck repair shops," says amateur radio operator Adinei Brochi (PY2ADN) "Nearly illiterate men rigged a radio in less than one minute, rolling wire on a coil.""
]]></description>
<dc:subject>satellite hacking radio security government ownership owner-builder disintermediation-targets space</dc:subject>
<dc:identifier>https://pinboard.in/u:Vaguery/b:467d53c0bf4f/</dc:identifier>
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<item rdf:about="http://imakethings.com/Hacker-Space-Design-Patterns.pdf">
    <title>Design Patterns for Hacker Space</title>
    <dc:date>2008-06-27T15:43:53+00:00</dc:date>
    <link>http://imakethings.com/Hacker-Space-Design-Patterns.pdf</link>
    <dc:creator>Vaguery</dc:creator><dc:subject>via:bkerr coworking cultural-norms business-plan hacking space planning advice</dc:subject>
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<item rdf:about="http://science.nasa.gov/headlines/y2007/21sep_caves.htm">
    <title>NASA - Cave Skylights Spotted on Mars</title>
    <dc:date>2007-09-23T11:23:00+00:00</dc:date>
    <link>http://science.nasa.gov/headlines/y2007/21sep_caves.htm</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA[One is reminded of the sinkholes of northwest Kentucky....
]]></description>
<dc:subject>areology geology space Mars Martian exploration planetology imaging</dc:subject>
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<item rdf:about="http://www.nasawatch.com/archives/2007/04/new_mexico_spac.html">
    <title>New Mexico Spaceport Moves Closer To Reality | NASA Watch</title>
    <dc:date>2007-04-07T21:50:18+00:00</dc:date>
    <link>http://www.nasawatch.com/archives/2007/04/new_mexico_spac.html</link>
    <dc:creator>Vaguery</dc:creator><dc:subject>space business-plan spaceport planning public-policy astronautics New-Mexico</dc:subject>
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