What started in late 2016 as a weekend project to design and build a 200mW multiband WSPR-
beacon has now become quite mature, thanks to the many Hams out there who kept encouraging me.
For details on all the different releases & designs of the beacon please follow the link below.
The latest version has its focus on modularity and using off-the-shelf components to make it easy to copy even for newcomers. It covers 160-6m at a max. power of 1 watt, has a built-in SWR-meter and is GPS-controlled by a remote, outdoor unit (time synchronization, calculation of the locator, ...).
"BitRadio" - a Software Defined Radio based on the Java™ programming language
As prices for computer hardware have been constantly dropping SDRs have become increasingly popular. Nowadays they are very common but the "magic" bringing them to life often remains a mystery. Having studied Electrical Engineering a long time ago, my curiosity was sparked. Sure there is plenty of excellent SDR-software freely available on the web. However, reinventing the wheel (and again making all mistakes that had ever been made) gave me great pleasure and turned out, at times, to be very instructive. If you are looking for an easy-to-use SDR software that runs on whatever supports Java™ and a sound-card or if you'd like to write your own SDR software, feel free to download "BitRadio" and its components from the link below.
Low budget tracking system for satellites with eccentric, high-apogee orbits
The idea for this dates back to 2003. At that time AO-40 was still intact and our club members
were keen to take a first step into the yet uncharted territory of satellite communication. The
budget was low, donations (in hardware) were made, but the rotor for elevation and azimuth turned out to be a potential show-stopper. Those devices are expensive and all we could afford was a simple, one axis rotor for TV-antennas. Impossible? Read the article below. With some limitations it can indeed be done!