Homebrewed Yagi-Udas with NEC2C and “automatik”
NEC2C is a well-known software for calculating frequency-dependent radiation patterns and feedpoint impedances of antennas. The open source software “automatik“, which is a…
radioircd – experimental version of an APRS chat published
Just over two years ago, I wrote about a project idea in this blog. An open source APRS client for the command line…
hamspirit.de’s KiwiSDR with excellent Signal-Noise-Ratio
What seemed impossible just a few years ago is now reality: a global network of SDR receivers that allows to monitor the HF…
DMR Direct-Mode over 74km – and again with stub antenna ;-)
Remember my article the other day about my DMR-Simplex QSO with Max, DG1TAL? Among other things, the article was about the fact that…
53 km distance bridged in DMR direct mode – from stub antenna to stub antenna!
Most radio amateurs only use DMR via relays or hotspots. Direct contacts on a simplex frequency are rather the exception. Too bad, because…
Using APRSdroid offline with OpenStreetMap
Today I want to explain how you can use APRSdroid with the maps of OpenStreetMap. The OSM maps have to be downloaded and…
A station clock with a NCDXF beacon indication
A precise station clock with indication in UTC is probably needed by every ham who’s active on the shortwave bands. And when it…
APRS via ISS – Tips for successful operation
Just over a year ago an article about my APRS experiments with the International Space Station appeared in the zeroth issue of the…
OpenWebRX on a Raspberry Pi
The Raspberry Pi has been able to mobilise masses of tinkerers and get them to realize their own project, just months after its…
