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KO4BB's Wiki http://www.ko4bb.com/dokuwiki/ 2014-05-23T17:14:26-04:00 KO4BB's Wiki http://www.ko4bb.com/dokuwiki/ http://www.ko4bb.com/dokuwiki/lib/images/favicon.ico text/html 2014-05-22T17:07:23-04:00 ko4bb home http://www.ko4bb.com/dokuwiki/doku.php?id=home&rev=1400792843&do=diff This Wiki is a user-editable set of pages intended to provide information about Ham Radio, Precision Timing, Test Equipment and related topics. Feel free to add information and/or create new pages. If you are not familiar with Wikis, you can play in the Sandbox. The editor has convenient buttons for the most common formatting, but the Syntax page has the whole thing! Please check the Style Guide before making edits or creating new pages, thank you! Didier KO4BB text/html 2013-05-23T08:26:35-04:00 ko4bb random:installing_archlinux_on_an_sd_card http://www.ko4bb.com/dokuwiki/doku.php?id=random:installing_archlinux_on_an_sd_card&rev=1369311995&do=diff Installing ArchLinux on the BeagleBone Black via SD card At a minimum, you need to create the first partition on an SD card to store the bootloader files and kernel uImage. For the root filesystem you can choose to use either a USB drive or the second partition on the SD card. This example will partition an SD card. Replace instances of /dev/sdX with the device that the card registers as on your computer. text/html 2013-05-08T09:07:46-04:00 ko4bb precision_timing:allan_variance http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:allan_variance&rev=1368018466&do=diff From the Time-Nuts mailing list: Well, I have been sort of staying out of the recent discussions regarding oscillator stability measurements, ADEV, etc., but here goes my two cents worth. I hope it doesn't muddy the waters too much and is somewhat helpful. text/html 2013-04-25T18:47:08-04:00 ko4bb wiki:syntax http://www.ko4bb.com/dokuwiki/doku.php?id=wiki:syntax&rev=1366930028&do=diff DokuWiki supports some simple markup language, which tries to make the datafiles to be as readable as possible. This page contains all possible syntax you may use when editing the pages. Simply have a look at the source of this page by pressing the Edit this page button at the top or bottom of the page. If you want to try something, just use the playground page. The simpler markup is easily accessible via quickbuttons, too. text/html 2013-04-25T07:21:53-04:00 ko4bb precision_timing:low_noise_mixer_preamp http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:low_noise_mixer_preamp&rev=1366888913&do=diff The circuit uses a low flicker noise SSM2220 pnp input stage with an OP27 output stage and an AD820 dc servo stage. It has a gain of 60dB and a <1Hz to >300kHz 3dB frequency response. It can accommodate mixer IF port dc offsets of up to 40 millivolts. It is suitable for use with PC sound cards and low frequency spectrum analysers for measuring phase noise. The offset frequency range is [20Hz, 20kHz] when using a sound card. text/html 2013-02-26T22:58:43-04:00 random:setting_up_the_ts-7553_sbc http://www.ko4bb.com/dokuwiki/doku.php?id=random:setting_up_the_ts-7553_sbc&rev=1361937523&do=diff The TS-7553 is a Single Board Computer based on a 250MHz ARM9 CPU. It is made by Technologic Systems: <http://www.embeddedarm.com/products/board-detail.php?product=TS-7553> It has 64MB of RAM, 256MB of on-board flash loaded with a lean Debian distribution running busybox. text/html 2013-02-24T12:25:35-04:00 random:configuring_ssl_for_https_support_with_debian http://www.ko4bb.com/dokuwiki/doku.php?id=random:configuring_ssl_for_https_support_with_debian&rev=1361726735&do=diff Configuring SSL for https support with Debian From: <http://www.debianadmin.com/install-and-configure-apache2-with-php5-and-ssl-support-in-debian-etch.html> The Apache HTTP Server Project is an effort to develop and maintain an open-source HTTP server for modern operating systems including UNIX and Windows NT. The goal of this project is to provide a secure, efficient and extensible server that provides HTTP services in sync with the current HTTP standards.