Homemade 10 Mbit/s Laser / optical Ethernet transceiver

Today’s network backbones don’t use copper wires any more — they use lasers to transmit information. The laser light usually propagates in a fiber, but while convenient, this isn’t strictly necessary; you can also send the laser light through the air in a collimated beam, like an ordinary laser pointer. Because this sounds cool, I thought I could build something like that. Here’s the prototype: Concept For simplicity, I decided […]

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Randa sprint wrap-up and considerations on packaging complex applications with AppImage

On Sunday, this year’s KDE sprint in Randa, Switzerland came to an end and I am now back home. It was a productive and fun week, as always when meeting the other KDE folks. I spent a lot of time on polishing things and fixing small issues mostly in KDevelop, such as: reduce flickering of the completion widget in kdevelop fix various cases where KDevelop’s navigation widget (see above) would […]

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KDevelop 5.0 standalone executable for Linux

I am currently at the KDE sprint in Randa, Switzerland. There are about 40 nice people here, working on making KDE software awesome. This year’s focus is on deploying our software more nicely — on Windows and OS X, but on Linux as well. Especially for user-faced applications like KDevelop, it really makes a big difference whether you use today’s version, or the one from two years ago. Many people […]

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kdev-python on Windows: try it!

I spent the last two or three days playing around with KDE on Windows, with the aim of getting my Python language plugin for KDevelop to run there. In the end, it wasn’t that hard to get this to work — not as hard as I would have expected it to be, anyways. Several things needed to be fixed in kdev-python, the build system required a bit of tickling, but […]

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kate / KDevelop sprint in Berlin

The last few days, we had a joint kate and KDevelop sprint in Berlin. I finally found the time to fix up the Python language support plugin for KDevelop, which was in a quite bad shape in the last few months. Most importantly, the 1.7-py3 branch now supports Python 3.4.3, and the master branch supports KF5 (this mostly thanks to Laurent, who did most of the porting) and Python 3.5, […]

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21cm HI telescope: first results

During the last days, I had the chance to record some radio astronomy data with my 1.4 GHz telescope. The receiver system is more or less unchanged compared to what I described in the last post, except that I have pretty versions of the amplifier and filter boards now: For the measurements I performed until now, I only used a small biquad antenna without parabolic reflector. The collecting area is […]

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21cm hydrogen line telescope, version 2

Much has happened since my last status report on my attempts to observe the galactic hydrogen emission at the famous 1420.4 MHz hyperfine structure line. Now, the new setup is finally proven to be basically working, and in this post I want to describe some of the changes I did. New data acquisition module Most importantly, I replaced the spectrum analyzer by a self-made data acquisition unit which is basically […]

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Snippets in Kate 5

Recently I spent some time to port and clean up the Snippets plugin and the underlying template interface for Kate 5.  It’s now fully working again and more powerful than ever. The template code was originally written by Joseph Wenniger and most of what I show here is still working like originally implemented by him. Still, there were some improvements I would like to show; also, I’m sure many readers […]

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