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!DOCTYPE html>!--if IEMobile 7 >html classno-js iem7>!endif-->!--if lt IE 9>html classno-js lte-ie8>!endif-->!--if (gt IE 8)|(gt IEMobile 7)|!(IEMobile)|!(IE)>!-->html classno-js langen>!--!endif-->head>  meta charsetutf-8>  title>lucsmall.com/title>  meta nameauthor contentLuc Small>    meta namedescription contentOver the southern hemiphere summer of 2016/2017 I made a flurry of antennas tuned to 1090MHz to capture position information from aircraft ADS-B …>    !-- http://t.co/dKP3o1e -->  meta nameHandheldFriendly contentTrue>  meta nameMobileOptimized content320>  meta nameviewport contentwidthdevice-width, initial-scale1>    link relcanonical hrefhttps://lucsmall.com>  link href/favicon.png relicon>  link href/stylesheets/screen.css mediascreen, projection relstylesheet typetext/css>  link href/atom.xml relalternate titlelucsmall.com typeapplication/atom+xml>  script src/javascripts/modernizr-2.0.js>/script>  script src//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js>/script>  script>!window.jQuery && document.write(unescape(%3Cscript src./javascripts/lib/jquery.min.js%3E%3C/script%3E))/script>  script src/javascripts/octopress.js typetext/javascript>/script>  !--Fonts from Googles Web font directory at http://google.com/webfonts -->link hrefhttps://fonts.googleapis.com/css?familyPT+Serif:regular,italic,bold,bolditalic relstylesheet typetext/css>link hrefhttps://fonts.googleapis.com/css?familyPT+Sans:regular,italic,bold,bolditalic relstylesheet typetext/css>    script typetext/javascript>    var _gaq  _gaq || ;    _gaq.push(_setAccount, UA-21521379-1);    _gaq.push(_trackPageview);    (function() {      var ga  document.createElement(script); ga.type  text/javascript; ga.async  true;      ga.src  (https:  document.location.protocol ? https://ssl : http://www) + .google-analytics.com/ga.js;      var s  document.getElementsByTagName(script)0; s.parentNode.insertBefore(ga, s);    })();  /script>/head>body   >  header rolebanner>hgroup>  h1>a href/>lucsmall.com/a>/h1>  /hgroup>/header>  nav rolenavigation>ul classsubscription data-subscriptionrss>  li>a href/atom.xml relsubscribe-rss titlesubscribe via RSS>RSS/a>/li>  /ul>  form actionhttps://google.com/search methodget>  fieldset rolesearch>    input typehidden nameq valuesite:lucsmall.com />    input classsearch typetext nameq results0 placeholderSearch/>  /fieldset>/form>  ul classmain-navigation>  li>a href/about>About/a>/li>  li>a href/>Blog/a>/li>  li>a href/archives>Archives/a>/li>  li>a hrefhttp://b7971.lucsmall.com/>B-7971 Nixie Character Designer/a>/li>/ul>/nav>  div idmain>    div idcontent>      div classblog-index>          article>        header>          h1 classentry-title>a href/2017/02/06/making-antennas-for-1090mhz-ads-b-aircraft-tracking/>Making Antennas for 1090MHz ADS-B Aircraft Tracking/a>/h1>              p classmeta>          time datetime2017-02-06T00:00:00+11:00 pubdate data-updatedtrue>Feb 6span>th/span>, 2017/time>              /p>      /header>  div classentry-content>p>Over the southern hemiphere summer of 2016/2017 I made a flurry of antennas tuned to 1090MHz to capture position information from aircraft ADS-B broadcasts. Here I document them, from newest to oldest./p>p>The nice thing about making antennas for Gigahertz frequencies is that they tend to be rather compact. The wavelength of a 1090MHz transmission is approximately 275mm. Since the length of the antenna elements shares a relationship with the wavelength, this means you can make antennas with few materials, very inexpensively./p>p>The newer antennas use F connectors to attach to my a hrefhttp://lucsmall.com/2017/02/01/ruggedised-usb-dvb-t-dongle-for-sdr/>ruggedised USB DVB-T dongle/a>, which in turn connects to my a hrefhttp://lucsmall.com/2017/01/31/ruggedised-orange-pi-zero/>ruggedised Orange Pi Zero/a> which a hrefhttp://lucsmall.com/2017/01/29/aircraft-tracking-with-the-orange-pi-zero/>runs software to track aircraft/a>./p>p>a href/images/2017-02-06-00-spider-antenna-by-night.png>img src/images/preview/2017-02-06-00-spider-antenna-by-night.png title"A 16 radial spider antenna for ADSB mounted on a tripod, at sunset" alt"A 16 radial spider antenna for ADSB mounted on a tripod, at sunset">/a>/p>/div>        footer>      a relfull-article href/2017/02/06/making-antennas-for-1090mhz-ads-b-aircraft-tracking/>Read on →/a>    /footer>      /article>        article>        header>          h1 classentry-title>a href/2017/02/01/ruggedised-usb-dvb-t-dongle-for-sdr/>Ruggedised USB DVB-T Dongle for SDR/a>/h1>              p classmeta>          time datetime2017-02-01T00:00:00+11:00 pubdate data-updatedtrue>Feb 1span>st/span>, 2017/time>              /p>      /header>  div classentry-content>p>Having recently developed an interest in tracking aircraft using software defined radio (SDR) techniques to capture ADS-B broadcasts with a cheap USB DVB-T dongle, I wanted a more robust setup./p>p>I’ve already written about my steps to a hrefhttp://lucsmall.com/2017/01/31/ruggedised-orange-pi-zero/>ruggedise an Orange Pi Zero/a> for outdoor use. In this post, I describe how I did essentially the same thing to the USB DVB-T dongle, so it could be mounted outside, on an antenna mast or tripod./p>p>Here’s the end result:/p>p>a href/images/2017-02-01-01-completed-dongle-in-use.jpg>img src/images/preview/2017-02-01-01-completed-dongle-in-use.jpg title"Completed dongle in use with spider antenna fitted" alt"Completed dongle in use with spider antenna fitted">/a>/p>p>At one end there’s an F connector for connecting an antenna either directly or via a length of coax. At the other end is a 5-pin GX16 connector carrying USB power and data./p>p>To provide an extra level of protection from the rain, the unit can be shrouded in a section of PVC pipe with an end cap fitted./p>/div>        footer>      a relfull-article href/2017/02/01/ruggedised-usb-dvb-t-dongle-for-sdr/>Read on →/a>    /footer>      /article>        article>        header>          h1 classentry-title>a href/2017/01/31/ruggedised-orange-pi-zero/>Ruggedised Orange Pi Zero/a>/h1>              p classmeta>          time datetime2017-01-31T00:00:00+11:00 pubdate data-updatedtrue>Jan 31span>st/span>, 2017/time>              /p>      /header>  div classentry-content>p>I wanted a robust enclosure for my a hrefhttp://linux-sunxi.org/Xunlong_Orange_Pi_Zero>Orange Pi Zero/a>, so it could be placed outside and withstand at least a bit of dust and a little rain from time to time. It had to expose a power connection and a USB port and have good wifi reception. The principle use case was as a headless Linux box to run a hrefhttps://github.com/antirez/dump1090>dump1090/a> so I could track aircraft using an attached USB DVB-T dongle./p>p>Here is what I came up with:/p>p>a href/images/2017-01-31-ruggedised-orange-pi-end-view.jpg>img src/images/preview/2017-01-31-ruggedised-orange-pi-end-view.jpg title"Ruggedised Orange Pi Zero - end view" alt"Ruggedised Orange Pi Zero - end view">/a>/p>p>The Orange Pi Zero is housed in a diecast aluminium enclosure. Power is provided by a 2-pin GX16 connector at one end, while USB signals are carried over a 5-pin GX16 connector at the other end. I like the GX16 connectors since they are fairly easy to solder, very mechanically robust, and have an old-world aesthetic. Wifi is brought out to an external antenna not unlike one found on the back of a wifi router. All in all, this setup feels pretty solid./p>p>Read on if you’d like further details, including a bill of materials, a connection diagram and a drilling template./p>p>a href/images/2017-01-31-ruggedised-orange-pi-top-view.jpg>img src/images/preview/2017-01-31-ruggedised-orange-pi-top-view.jpg title"Ruggedised Orange Pi Zero - top view" alt"Ruggedised Orange Pi Zero - top view">/a>/p>p>If you’re more interested in the software side of things, I have a complete a hrefhttp://lucsmall.com/2017/01/29/aircraft-tracking-with-the-orange-pi-zero/>tutorial about configuring the Orange Pi Zero for tracking aircraft/a> and a basic guide to a hrefhttp://lucsmall.com/2017/01/19/beginners-guide-to-the-orange-pi-zero/>getting started with the Orange Pi Zero/a> you might like to read./p>/div>        footer>      a relfull-article href/2017/01/31/ruggedised-orange-pi-zero/>Read on →/a>    /footer>      /article>        article>        header>          h1 classentry-title>a href/2017/01/29/aircraft-tracking-with-the-orange-pi-zero/>Aircraft Tracking With the Orange Pi Zero/a>/h1>              p classmeta>          time datetime2017-01-29T00:00:00+11:00 pubdate data-updatedtrue>Jan 29span>th/span>, 2017/time>              /p>      /header>  div classentry-content>p>The Orange Pi Zero is a neat low cost single board computer. When paired with a cheap DVB-T digital television receiver it makes an excellent platform for tracking aircraft broadcasting ADS-B messages in your area using software defined radio (SDR) techniques./p>p>The Orange Pi Zero is an attractive choice for this application because:/p>ul>li>it is very compact, foregoing things like HDMI connectors which are not required for the application./li>li>it supports wifi as well as wired ethernet./li>li>it is quite powerful, having an Allwinner H2+ system-on-chip (SoC) featuring a quad core ARM Cortex-A7 processor. Full specs and other useful information is available on the a hrefhttp://linux-sunxi.org/Xunlong_Orange_Pi_Zero>linux-sunxi.org wiki/a>./li>li>Linux support is very good, thanks to Armbian./li>li>it is very cheap./li>/ul>p>Wifi support is particularly handy, since you can situate the Orange Pi Zero and the USB DVB-T dongle close to a suitable antenna and relay aircraft tracking data back to other computers on your network using wifi. Indeed, with a weatherproof enclosure, everything could be mounted right next to the antenna on a rooftop. This would minimise attenuation of the signals received from planes by keeping the coax cable run between the antenna and the DVB-T dongle as short as possible. Thanks to wifi, the only cabling required to the system would be to deliver power./p>p>But that’s getting a bit ahead of ourselves. Remarkably, even a very simple setup, with everything including the antenna located indoors can track a surprising number of planes./p>p>a href/images/2017-01-29-usb-dvbt-dongle-orangepi-zero-connections.jpg>img src/images/preview/2017-01-29-usb-dvbt-dongle-orangepi-zero-connections.jpg title"A basic aircraft tracking rig featuring an Orange Pi Zero, USB DVB-T dongle and antenna" alt"A basic aircraft tracking rig featuring an Orange Pi Zero, USB DVB-T dongle and antenna">/a>/p>p>In this tutorial I will provide step-by-step instructions to get an Orange Pi Zero working with a USB DVB-T dongle to receive tracking information from aircraft./p>/div>        footer>      a relfull-article href/2017/01/29/aircraft-tracking-with-the-orange-pi-zero/>Read on →/a>    /footer>      /article>        article>        header>          h1 classentry-title>a href/2017/01/19/beginners-guide-to-the-orange-pi-zero/>Beginners Guide to the Orange Pi Zero/a>/h1>              p classmeta>          time datetime2017-01-19T00:00:00+11:00 pubdate data-updatedtrue>Jan 19span>th/span>, 2017/time>              /p>      /header>  div classentry-content>p>The Orange Pi Zero is a neat low cost single board computer:/p>ul>li>it is very compact (approx. 46 x 48mm)./li>li>it forgoes things like HDMI connectors, making it ideal for headless, embedded applications./li>li>it supports wifi as well as wired ethernet./li>li>it is quite powerful, having an Allwinner H2+ system-on-chip (SoC) featuring a quad core ARM Cortex-A7 processor. Full specs and other useful information is available on the a hrefhttp://linux-sunxi.org/Xunlong_Orange_Pi_Zero>linux-sunxi.org wiki/a>./li>li>Linux support is very good, thanks to Armbian./li>li>it is very cheap./li>/ul>p>In this tutorial I provide step-by-step instructions to get a working Armbian Linux environment on the Orange Pi Zero./p>p>a href/images/2017-01-19-orange-pi-zero-top.jpg>img src/images/preview/2017-01-19-orange-pi-zero-top.jpg title"Orange Pi Zero top view" alt"Orange Pi Zero top view">/a>/p>p>a href/images/2017-01-19-orange-pi-zero-bottom.jpg>img src/images/preview/2017-01-19-orange-pi-zero-bottom.jpg title"Orange Pi Zero bottom view" alt"Orange Pi Zero bottom view">/a>/p>/div>        footer>      a relfull-article href/2017/01/19/beginners-guide-to-the-orange-pi-zero/>Read on →/a>    /footer>      /article>        article>        header>          h1 classentry-title>a href/2016/10/08/neon-ring-counters/>Neon Ring Counters/a>/h1>              p classmeta>          time datetime2016-10-08T00:00:00+11:00 pubdate data-updatedtrue>Oct 8span>th/span>, 2016/time>              /p>      /header>  div classentry-content>p>I got interested in neon ring counters after seeing PA3FWM’s incredible a hrefhttp://wwwhome.ewi.utwente.nl/~ptdeboer/ham/neonclock/>Nixie-clock using neon lamps as logic elements/a>. Quickly I discovered Ronald Dekker’s comprehensive a hrefhttp://www.dos4ever.com/ring/ring.html>Ring Counter Variations/a> page. It lead me to an old book, “Electronic Counting Circuits” by J.B. Dance a hrefhttp://www.tube-tester.com/sites/nixie/dat_arch/Ericsson-Databook.zip>available from Dieter’s Nixie World/a> (zipped PDF document). I highly recommend taking a read of all these sources./p>p>What I found captivating about these devices was that each neon bulb had a dual function. Not only does each bulb indicate the count but it also stores the state of the count. Each neon acts as a memory device, holding its state until the next pulse arrives. With a handful of neon bulbs it is therefore possible to create a counter or a divider. And the only other parts required are some readily obtained resistors, diodes and capacitors. No transistors, no integrated circuits, no other tubes. Just neon bulbs./p>p>Enchanted by the simplicity of all of this, I just had to give making a neon ring counter a go; here is the result:/p>iframe classyoutube width480 height360 srchttps://www.youtube.com/embed/gCBfzgt3lcg  frameborder0 allowfullscreen>/iframe>/div>        footer>      a relfull-article href/2016/10/08/neon-ring-counters/>Read on →/a>    /footer>      /article>        article>        header>          h1 classentry-title>a href/2016/09/12/tessellation-row/>Tessellation Row/a>/h1>              p classmeta>          time datetime2016-09-12T00:00:00+10:00 pubdate data-updatedtrue>Sep 12span>th/span>, 2016/time>              /p>      /header>  div classentry-content>p>This was an experiment with making a hexagonal pixel display. Compared to square pixels, hexagonal pixels render diagonals, diamonds and circles more accurately. Conversely, they are less capable at rendering squares, rectangles, vertical and horizontal lines./p>p>Picture/Video/p>p>The display has 97 pixels and is approximately the size of an A3 sheet of paper. The richness of colour, brightness and responsiveness of the display are quite incredible.  An Arduino coupled to a Raspberry Pi 3 feed the LEDs with RGB data. It would be neat to scale up the display to cover an entire wall./p>/div>        footer>      a relfull-article href/2016/09/12/tessellation-row/>Read on →/a>    /footer>      /article>        article>        header>          h1 classentry-title>a href/2016/08/19/govhack-2016/>GovHack 2016/a>/h1>              p classmeta>          time datetime2016-08-19T00:00:00+10:00 pubdate data-updatedtrue>Aug 19span>th/span>, 2016/time>              /p>      /header>  div classentry-content>p>Over the weekend of 29-31st July 2016 I participated in my first a hrefhttps://www.govhack.org/>GovHack/a>. I teamed up with a hrefhttp://www.jacksimpson.co/>Jack Simpson/a>, whom I’ve known since we attended the same a hrefhttp://software-carpentry.org/>Software Carpentry/a> instructor training in Melbourne and worked out, through the normal course of conversation, that we were both Canberra residents./p>p>We camped out at the a hrefhttps://timsherratt.org/digital-heritage-handbook/events/uc-heritage-hack/>UC Heritage Hack/a> node at the University of Canberra. a hrefUC%20Heritage%20Hack>Tim Sherratt/a> organised the “themed” node to cater to those interested in devising hacks around cultural heritage datasets. He provided a a hrefhttps://timsherratt.org/digital-heritage-handbook/courses/heritage-hack-connections/>large number of examples/a> demonstrating the fascinating insights that can be gleaned from such datasets. He mentioned that cultural heritage data is often far from “clean”. Instead it contains inconsistencies, ambiguous elements, formatting issues, missing fields, and a blend of structured and unstructured data./p>p>All of this was true of the dataset Jack and I chose to work with. Our stated goal was simple: to visualise convict ship journeys to Australia over time. For this we turned to the a hrefhttp://slq.qld.gov.au>State Library of Queensland/a> digitised records of the a hrefhttps://data.gov.au/dataset/british-convict-transportation-registers>British convict transportation registers/a>. It lists over 123,000 of the estimated 160,000 convicts transported to Australia. What they were convicted of, what ship (or fleet) they journeyed on, when they departed, and where in Australia they alighted. It is a remarkable resource./p>/div>        footer>      a relfull-article href/2016/08/19/govhack-2016/>Read on →/a>    /footer>      /article>        article>        header>          h1 classentry-title>a href/2015/12/14/wifi-hack-for-raspberry-pi-zero/>Wifi Hack for Raspberry Pi Zero/a>/h1>              p classmeta>          time datetime2015-12-14T00:00:00+11:00 pubdate data-updatedtrue>Dec 14span>th/span>, 2015/time>              /p>      /header>  div classentry-content>p>I add wi-fi to my raspberry pi zero. This great little single board computer arrived in the mail just days ago. I sacrifice a micro usb cable and a tiny wi-fi dongle to add network connectivity./p>iframe classyoutube width480 height360 srchttps://www.youtube.com/embed/szyENkkTNzA  frameborder0 allowfullscreen>/iframe>p>For more details on configuring a wi-fi dongle under Raspbian, visit a href/2012/09/21/ralink-rt5370-usb-wifi-dongle-raspberry-pi/>this post/a>./p>/div>        /article>        article>        header>          h1 classentry-title>a href/2015/12/14/trying-out-a-ta2024-amplifier-module/>Trying Out a TA2024 Amplifier Module/a>/h1>              p classmeta>          time datetime2015-12-14T00:00:00+11:00 pubdate data-updatedtrue>Dec 14span>th/span>, 2015/time>              /p>      /header>  div classentry-content>p>I try out a class-D/class-T digital audio amplifier module, featuring the Tripath a hrefhttp://pdf.datasheetcatalog.com/datasheet/Tripath/mXyzxwwt.pdf>TA2024/a> integrated circuit./p>p>Available from a variety of sellers on a hrefhttp://www.aliexpress.com/>AliExpress/a>, this module sells for about US$5 delivered./p>iframe classyoutube width480 height360 srchttps://www.youtube.com/embed/8JxGzOyLax8  frameborder0 allowfullscreen>/iframe>/div>        /article>    div classpagination>          a classprev href/page/2/>← Older/a>        a href/archives>Blog Archives/a>      /div>/div>aside classsidebar>      section>  h1>Recent Posts/h1>  ul idrecent_posts>          li classpost>        a href/2017/02/06/making-antennas-for-1090mhz-ads-b-aircraft-tracking/>Making Antennas for 1090MHz ADS-B Aircraft Tracking/a>      /li>          li classpost>        a href/2017/02/01/ruggedised-usb-dvb-t-dongle-for-sdr/>Ruggedised USB DVB-T dongle for SDR/a>      /li>          li classpost>        a href/2017/01/31/ruggedised-orange-pi-zero/>Ruggedised Orange Pi Zero/a>      /li>          li classpost>        a href/2017/01/29/aircraft-tracking-with-the-orange-pi-zero/>Aircraft tracking with the Orange Pi Zero/a>      /li>          li classpost>        a href/2017/01/19/beginners-guide-to-the-orange-pi-zero/>Beginners guide to the Orange Pi Zero/a>      /li>      /ul>/section>  /aside>    /div>  /div>  footer rolecontentinfo>p>  Copyright © 2018 - Luc Small -  span classcredit>Powered by a hrefhttp://octopress.org>Octopress/a>/span>/p>/footer>  script typetext/javascript>      var disqus_shortname  lucsmall;                      var disqus_script  count.js;          (function () {      var dsq  document.createElement(script); dsq.type  text/javascript; dsq.async  true;      dsq.src  https:// + disqus_shortname + .disqus.com/ + disqus_script;      (document.getElementsByTagName(head)0 || document.getElementsByTagName(body)0).appendChild(dsq);    }());/script>  script typetext/javascript>    (function(){      var twitterWidgets  document.createElement(script);      twitterWidgets.type  text/javascript;      twitterWidgets.async  true;      twitterWidgets.src  https://platform.twitter.com/widgets.js;      document.getElementsByTagName(head)0.appendChild(twitterWidgets);    })();  /script>/body>/html>

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