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!DOCTYPE html>html langen>  head>    meta charsetutf-8>meta nameviewport contentwidthdevice-width, initial-scale1, shrink-to-fitno>meta propertyog:title contentVE7XEN's electronics blog />meta propertyog:description content />meta propertyog:type contentwebsite />meta propertyog:url content/ />meta propertyog:updated_time content2015-02-11T00:41:34+00:00/>meta nametwitter:card contentsummary/>meta nametwitter:title contentVE7XEN's electronics blog/>meta nametwitter:description content/>script typetext/javascript srchttps://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?configTeX-AMS-MML_HTMLorMML>/script>meta namegenerator contentHugo 0.38 />    script typeapplication/ld+json>{  @context: http://schema.org,  @type: Blog,  headline: VE7XEN's electronics blog,  url : /,  author: {    @type: Person,    name: Keenan Tims (VE7XEN)  },  dateModified: 2015-02-11T00:41:34+00:00,  keywords: blog,electronics,ham-radio,repair,review,time,ntp,}/script>    link relcanonical href./>    title>VE7XEN's electronics blog/title>    !-- combined, minified CSS -->    link href./css/style.css relstylesheet integritysha384-9f4fRSZyOI3WTqvH57HDIgPnSlRGM6XTtozUrY/Uar/OlrHUZKQurtdAI49M27WI crossoriginanonymous>        !-- RSS 2.0 feed -->    link href./index.xml relalternate typeapplication/rss+xml titleVE7XEN's electronics blog />                  /head>  body>        div classblog-masthead>      div classcontainer>        nav classnav blog-nav>          a classnav-link active href./>Home/a>        /nav>      /div>    /div>            header classblog-header>      div classcontainer>        h1 classblog-title>a href./ relhome>VE7XENs electronics blog/a>/h1>              /div>    /header>            div classcontainer>      div classrow>        div classcol-sm-8 blog-main>          article classblog-post>  header>    a href./blog/2015/02/11/quansheng-tg-45uv-protocol-reversing/>h2 classblog-post-title>Quansheng TG-45UV Protocol Reversing/h2>  /a>    p classblog-post-meta>time datetime2015-02-11T00:41:34Z>February 11, 2015/time> by Keenan Tims (VE7XEN) in i classfa fa-folder aria-hiddentrue>/i> a href./categories/ham-radio relcategory tag>ham radio/a>/p>  /header>  p>figure classfloat-right img-thumbnail>            img src./images/quansheng-tg45uv.jpg altQuansheng TG-45UV />        /figure>On a whim, I recently purchased the apparently new Quansheng TG-45UV to replace the a href2011-08-05-quansheng_tg-uv2_dual_band_ht_review>Quansheng TG-UV2/a> I lost del>this/del> last summer. A review and/or video might be forthcoming, but in the meantime I spent some time reverse engineering the serial protocol / data structure. strong>If you have one of these radios and want programming software, the Quansheng TG-K4AT UV software works/strong> and is what I based my efforts on./p>p>/p>  a href./blog/2015/02/11/quansheng-tg-45uv-protocol-reversing/>Read more →/a>/article> article classblog-post>  header>    a href./blog/2015/01/20/recording-nbfm-scanner-with-rtlsdr/>h2 classblog-post-title>Recording NBFM Scanner with RTLSDR/h2>  /a>    p classblog-post-meta>time datetime2015-01-20T23:16:05Z>January 20, 2015/time> by Keenan Tims (VE7XEN) in i classfa fa-folder aria-hiddentrue>/i> a href./categories/ham-radio relcategory tag>ham radio/a>/p>  /header>  p>figure classfloat-right img-thumbnail>            img src./images/pro_7b_scanner.gif altOld School Scanner />        /figure>Ever want to use your $20 RTLSDR dongle as a strong>simple FM scanner/strong> to listen to your local public safety orham radio repeater traffic? em>@nottheoilrig/em> on my a hrefhttp://www.hackspace.ca/>local hackspace’s/a>mailing list inquired about how to record analog FM off the air to a file. After some fiddling, Ifound this is quite simple with the code>rtl_fm/code> tool included in the osmocoma hrefhttp://sdr.osmocom.org/trac/wiki/rtl-sdr>rtl-sdr/a> distribution. The dongle and software does quitea good job scanning too, its pickup time is very quick even monitoring many channels./p>p>/p>  a href./blog/2015/01/20/recording-nbfm-scanner-with-rtlsdr/>Read more →/a>/article> article classblog-post>  header>    a href./blog/2014/03/19/canon-powershot-s110-repair-attempt/>h2 classblog-post-title>Canon PowerShot S110 repair attempt/h2>  /a>    p classblog-post-meta>time datetime2014-03-19T04:30:01Z>March 19, 2014/time> by Keenan Tims (VE7XEN) in i classfa fa-folder aria-hiddentrue>/i> a href./categories/repair relcategory tag>repair/a>/p>  /header>  p>a href./images/2014-03-19-canon-powershot-s110-repair-attempt-imager.jpg>figure classfloat-right>            img src./images/2014-03-19-canon-powershot-s110-repair-attempt-imager-400x400.jpg altCanon PowerShot S110 imager width250 height250 />        /figure>/a>Ever wonder what’s inside your digital camera? Here’s the imager and optics assembly from a Canon PowerShot S110 that I destroyed with mineral-y water and was trying to repair. Click for gigantic. Isn’t that CMOS sensor beautiful?/p>p>/p>  a href./blog/2014/03/19/canon-powershot-s110-repair-attempt/>Read more →/a>/article> article classblog-post>  header>    a href./blog/2014/03/07/programming-the-attiny841-with-avrdude/>h2 classblog-post-title>Programming the ATtiny841 with avrdude/h2>  /a>    p classblog-post-meta>time datetime2014-03-07T03:22:25Z>March 7, 2014/time> by Keenan Tims (VE7XEN) in i classfa fa-folder aria-hiddentrue>/i> a href./categories/electronics relcategory tag>electronics/a>/p>  /header>  p>Working with my good friend a hrefhttps://danielmclaren.tumblr.com/>Daniel McLaren/a> on a cool interactiveart project, I designed a board around the a hrefhttp://www.atmel.com/devices/ATTINY841.aspx>ATtiny841/a>,which is a nifty new entry to the AVR portfolio. Unfortunately when intial power up of theboard was successful, I found I was totally unable to write code to the device witha hrefhttp://www.nongnu.org/avrdude/>avrdude/a> as I normally would; the chip is unsupported in even thelatest version. I found a a hrefhttp://www.avrfreaks.net/index.php?namePNphpBB2&fileviewtopic&p1120422>helpful post/a>on AVRFreaks with a code listing for avrdude.conf that was purported to work, but I found itproduced verfication errors (and a non-working chip) every time./p>p>After much mucking around and recreating the part in avrdude a dozen times, I got it to work./p>p>/p>  a href./blog/2014/03/07/programming-the-attiny841-with-avrdude/>Read more →/a>/article> article classblog-post>  header>    a href./blog/2013/04/03/ebay-ad9850-board-performance-testing/>h2 classblog-post-title>eBay AD9850 board performance testing/h2>  /a>    p classblog-post-meta>time datetime2013-04-03T23:16:14Z>April 3, 2013/time> by Keenan Tims (VE7XEN) in i classfa fa-folder aria-hiddentrue>/i> a href./categories/electronics relcategory tag>electronics/a>/p>  /header>  Prompted by user Skimask over on the eevblog forums, I undertook some performance testing of an AD9850 module, readily available from eBay (search AD9850 DDS) for under $10 shipped. These are advertised as 0-40MHz devices, and appear to include the datasheet-recommended 5-pole output filter and a 125MHz canned oscillator. Measured distortion and spurious performance is excellent, especially for the bargain-basement price. Skimask was curious about the performance at audio frequencies, so I undertook some measurements at 1KHz and 5V.  a href./blog/2013/04/03/ebay-ad9850-board-performance-testing/>Read more →/a>/article> article classblog-post>  header>    a href./blog/2013/03/05/project-start-tinycounter-low-power-hf-frequency-counter/>h2 classblog-post-title>Project Start: tinyCounter low power HF frequency counter/h2>  /a>    p classblog-post-meta>time datetime2013-03-05T02:59:09Z>March 5, 2013/time> by Keenan Tims (VE7XEN) in i classfa fa-folder aria-hiddentrue>/i> a href./categories/ham-radio relcategory tag>ham radio/a>, a href./categories/electronics relcategory tag>electronics/a>/p>  /header>  Ive ordered myself an EA3GCY ILER-20 kit, and being a single-band QRP hand-tuned radio, I want a convenient counter. Im going to be using this in the field on battery power, so its got to sip the juice and be small (tiny!) and light. The design should be suitable for any small HF rig (and maybe 6 metres) with an easily accessible point to measure the VFO.I put together a design and just ordered PCBs.  a href./blog/2013/03/05/project-start-tinycounter-low-power-hf-frequency-counter/>Read more →/a>/article> article classblog-post>  header>    a href./blog/2013/03/04/commitment./>h2 classblog-post-title>Commitment./h2>  /a>    p classblog-post-meta>time datetime2013-03-04T22:26:02Z>March 4, 2013/time> by Keenan Tims (VE7XEN) in i classfa fa-folder aria-hiddentrue>/i> a href./categories/blog relcategory tag>blog/a>/p>  /header>  DSCF1907.JPG    Its been a while since Ive posted here, and many of the things I pledged to follow up on... havent been followed up on. Ive started several blogs in my life, and never seem to get past the 10 past mark without losing interest and giving up. This ones no exception, but if anyone is following this (or reads it in an archaeological dig 100s of years from now), heres the short version:  a href./blog/2013/03/04/commitment./>Read more →/a>/article> article classblog-post>  header>    a href./blog/2012/06/12/workman-wep2000---killed/>h2 classblog-post-title>Workman WEP2000 - killed!/h2>  /a>    p classblog-post-meta>time datetime2012-06-12T14:05:36Z>June 12, 2012/time> by Keenan Tims (VE7XEN) in i classfa fa-folder aria-hiddentrue>/i> a href./categories/ham-radio relcategory tag>ham radio/a>, a href./categories/review relcategory tag>review/a>/p>  /header>  A couple posts ago I mentioned the WEP2000 Id purchased to give mobile VHF a try, contrary to my original plan to just use it for APRS. For a while, I was reasonably happy with it; it was a pain to tune, but I was getting good signal reports and receive was good enough for my purposes. In the past week or two though Id noticed that while it was working, the receive power was much lower than it should have been, so I went to check the tuning on the through-the-glass box on the rear window.  a href./blog/2012/06/12/workman-wep2000---killed/>Read more →/a>/article> article classblog-post>  header>    a href./blog/2012/02/07/pomona-5519a-multimeter-test-leads/>h2 classblog-post-title>Pomona 5519a Multimeter Test Leads/h2>  /a>    p classblog-post-meta>time datetime2012-02-07T20:11:28Z>February 7, 2012/time> by Keenan Tims (VE7XEN) in i classfa fa-folder aria-hiddentrue>/i> a href./categories/electronics relcategory tag>electronics/a>, a href./categories/review relcategory tag>review/a>/p>  /header>  I did a short YouTube video on some Pomona 5519a test leads I picked up to replace the really cheap ones I was using. See the video:    a href./blog/2012/02/07/pomona-5519a-multimeter-test-leads/>Read more →/a>/article> article classblog-post>  header>    a href./blog/2012/02/07/antennas-ordered--future-projects/>h2 classblog-post-title>Antennas Ordered & Future Projects/h2>  /a>    p classblog-post-meta>time datetime2012-02-07T19:28:27Z>February 7, 2012/time> by Keenan Tims (VE7XEN) in i classfa fa-folder aria-hiddentrue>/i> a href./categories/ham-radio relcategory tag>ham radio/a>/p>  /header>  Shortly after getting my ham license I started fooling around with antennas. Built myself a very shoddy 2m ground plane 1/4 wave just to get an antenna outside for use with my HT, as the whips cant get anywhere from inside. Then I decided to upgrade to a proper antenna - a coaxial dipole design by W6NBC published in the July 2009 QST. This worked fantastically well for a couple of months, then a solder joint broke between the antenna connector and the radiator element.  a href./blog/2012/02/07/antennas-ordered--future-projects/>Read more →/a>/article> nav classblog-pagination>        a classbtn btn-outline-primary disabled href# rolebutton aria-disabledtrue>Previous page/a>  a classbtn btn-outline-primary href./page/2/ relnext rolebutton>Next page/a>  /nav>        /div> !-- /.blog-main -->        aside classcol-sm-3 ml-auto blog-sidebar>            section classsidebar-module>    h4>Recent Posts/h4>    ol classlist-unstyled>li>a href./blog/2015/02/11/quansheng-tg-45uv-protocol-reversing/>Quansheng TG-45UV Protocol Reversing/a>/li>li>a href./blog/2015/01/20/recording-nbfm-scanner-with-rtlsdr/>Recording NBFM Scanner with RTLSDR/a>/li>li>a href./blog/2014/03/19/canon-powershot-s110-repair-attempt/>Canon PowerShot S110 repair attempt/a>/li>li>a href./blog/2014/03/07/programming-the-attiny841-with-avrdude/>Programming the ATtiny841 with avrdude/a>/li>li>a href./blog/2013/04/03/ebay-ad9850-board-performance-testing/>eBay AD9850 board performance testing/a>/li>    /ol>  /section>    /aside>      /div> !-- /.row -->    /div> !-- /.container -->            footer classblog-footer>      p>            Blog template created by a hrefhttps://twitter.com/mdo>@mdo/a>, ported to Hugo by a hrefhttps://twitter.com/mralanorth>@mralanorth/a>.            /p>      p>      a href#>Back to top/a>      /p>    /footer>      /body>/html>

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