Category: HAM RADIO

Quarter wave stub matching

Während die transformatorische Anpassung über einen großen Frequenzbereich funktioniert, ist die Anpassung über Transformationsleitung (üblicherweise 1/4 Wellenleitung) toleranter gegenüber Fehlanpassungen. Hierdurch entstehen größere nutzbare Bandbreiten. Dadurch, dass beim Viertelwellen-Leitungstrafo immer das geometrische Mittel aus Eingangsimpedanz und Wellenwiderstand der Leitung bestimmt wird, weicht der Ausgangswiderstand auch weniger stark vom Wellenwiderstand ab. Es findet quasi eine Art […]

ON4UN SK

ON4UN

In deep mourning the Rhein-Ruhr-DX-Association has to announce that John, ON4UN, has become silent key. John´s contributions were honoured through his membership in RRDXA hall of fame. The sad news was given by his daughter. His radio activities and station setup will always be remembered. With John, ON4UN, we have lost a most valuable radio friend […]

Contests and Club Competitions

Potentially preaching to the converted: In addition to individual scores there are club competitions in all major contests. In Germany there are two big Contestclubs Bavarian Contestclub:          www.bavarian-contest-club.de   und Rhein Ruhr DX Association: https://rrdxa.org/ In addition to Club-competitions these Clubs offer other benefits, such as: Exchange of information, education and training for members or social […]