It is not easy for me to start this full article, as it collects about a couple of years of technical work conducted with other friends . I decided to divide this work into three parts. A first part made by Jan Jozef Oksiuta (VK4EBP) from Australia, a second that follows some old works done […]
This will be the first part of a larger project that will include other friends that have collaborated with me directly or indirectly this last year. It was in many ways, a funny and interesting project to follow. All schematics, codes and results are free for use , please just give references to authors. USE CAUTION […]
I’ve tried for fun ,to record with a cheap USB Sound Card, a Radxa Rock Board with a custom kernel (added some audio and USB modules) running Ubuntu Server and the Explorer E202 , some stations in the VLF band. We usually monitor them in Turin observatory for SID correlations (http://sidmonitor.rf.gd/gallery/station.html ) The VLF receiver […]
The Raspberry Pi B 512 MB connected to my “old” Aspire One with a crossover cable If you need precise and accurate time for your projects while sampling a digital record or doing something that need precise timestamps you can use a Raspberry Pi with the Adafruit Breakout GPS module to build a stratum 1 NTP […]
During these days i was searching for something modular and scalable that can gives me a clear PPS ( http://en.wikipedia.org/wiki/Pulse_per_second ) from a GPS satellite with some datas like UTC times.I’ve tested the Arduino UNO board with the Adafruit GPS module. It’s very easy to use them on a little breadboard. The Adafruit GPS is […]
So now we should have our little Unix server running into the WandBoard with SSH running and SFTP of course. Let’s have fun installing NTP client ! First of all we should want have a precise clock. FreeBSD is capable to use NTP protocol as server or client. The protocol is a UDP so it […]
In the previous post I did a quick overview of what I think are two valid alternatives to the common development boards as Raspberry or BeagleBoard. Radxa and Wandboard. Since i would like to use the Wandboard as a little backup server I’ve decided to put inside it FreeBSD 10.1 . So this guide will […]
Delta² 