Amateur radio propagation studies

science, research, engineering, operating

About DF5AI

Volker studied physics at the University of Göttingen, Germany. In 1983 he joined the Max-Planck-Institute for Aeronomie (MPAE) where he worked with the multinational EISCAT research group (European Incoherent Scatter Association). The focus of his research was thermospheric winds in the upper atmosphere, gravity waves, Aurora Borealis, sporadic E and the incoherent backscatter of radiowaves in the ionosphere. He works in the telecommunication since 1993. Volker is an Associate of the RSGB Propagation Studies Committee.

Amateur radio software

Volker developed a variety of amateur radio programs:

• QTH_LOC is his first software using eye-catching screen maps
• the Aurora program applies scientific results from the Max-Planck-Institute for Aeronomie to analyse Aurora and FAI radio propagation in real time
• the prediction tool CHIRP ("Characteristics of ionospheric radio propagation") is based on the MINIFTZ routines courtesy of "Forschungsinstitut der Deutschen Bundespost am Fernmeldetechnischen Zentralamt"
• AMADEUS ("Ausgewählte Methoden zur Auffassung und Darstellung elliptisch umlaufender Satelliten") is a satellite tracking program which, at its time of publication, outperformed other products of this type because of its efficient calculation routines and its graphical capabilities
• OLGA ("Optimierung linearer Gruppenantennen") is an antenna engineering tool which optimises the radiation pattern of stacked arrays
• the latest update of the HamLogBook database cooperates with the BeamFinder software by sending actual QSO data to the program
• its companion, the BeaconList database, files a large amount of beacon data and provides a variety of tools for hunting beacon signals
• however, his biggest software project in amateur radio is BeamFinder which required thousands of hours in software development, testing, calculations and investigations. BeamFinder may be considered a living project due to the long list of functions, analyses and features which are planned for future releases

Antenna design

Volker put his callsign on the air using many types of amateur radio antennas, including small arrays, e.g. the HB9CV, and structures such as Yagi arrays of 20, 40 and 80 elements. He has experimented with Helix-, Zigzag-, Log Periodic- and Short Backfire antennas, probably because radio amateurs are never satified with the current antenna system. In research, he worked with the big guns operated by the EISCAT organisation. Volker was on duty in Kiruna, Sweden, and in Sodanklyä, Finland, and since then he is fascinated by the Scandinavian culture, its hospitality and by the Scandinavian engineering skills. In mobile communication, Volker and his team built a nationwide transmitter network in Germany, comprising a large amount of basestations as well as satellite and terrestrial antenna systems.

Ireland

Volker is married to an Irish lady and he claims that their two little daughters are real Irish characters. Friends say this is an excuse because it is hard get the three femals to agree. He loves travelling to Ireland and you may find Volker and his family in the Irish pubs chatting away with the local residents. If you can't find him there he's probably visiting the Newgrange monument which awakened his interest in archaeology ("we would fail if we try to place a couple of stones in our garden to predict astronomical events. However, the people from 5000 years ago made it").

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