Sorry, this entry is only available in German. For the sake of viewer convenience, the content is shown below in the alternative language. You may click the link to switch the active language. RRDXA DX Dinner Der Restart der Hamradio steht vor der Tür und die RRDXA möchte am Freitag den 24.6. zum RRDXA DX […]
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 […]
WRTC postponed
Shortened Log deadlines
There is a general tendency towards short log deadlines. For instance, the due-date for the Russian DX-Contest is already 4th of April and for CQ WPX SSB already 2nd April 2021. The other rule changes for the WPX are summarized in the blog on their webpage. Thus, please upload your log early and note the […]
WPX activity map
OT3T contest video (ON4UN)
John ON4UN was an RRDXA member since the early sixties. While doing background research at his untimely passing, we came across this video: https://youtu.be/uoQWrOTK-k0 The OT3T contest video is a detailed account on how John and his team prepared the station for the 1993 CQWW SSB contest. And how the contest was run (including strategy, […]
ON4UN SK
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 […]
DF7EE travel report from Madeira
TF/DJ7JC fresh blog
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 […]