At our contest station ED1R we have no space for permanent Lowband Verticals. Each Contest, the verticals have to be installed temporarily in a field nearly. Especially the deployment and removal of the antenna radials are very time-consuming. Over time we optimized our system which reduced the required time from 2 hours down to 30 minutes.

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This question bugged me after trying to exchange the connectors of a 25m long Aircell7 coax cable. During preparation, I discovered a black inner conductor. It seems water entered the cable. Do I have to throw it away? Read more to discover a probably unexpected answer!

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One of last year’s projects was the improvement of our Contest Station ED1R. For the various Yagis, we needed smart ways to combine antennas. Instead of buying commercial stackmatches (antenna combiners), I decided to build them up by myself and adjust them to our needs.

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With his low cost, high precision Vector Network Analyzer, Tom (DG8SAQ) started a revolution in Ham Radio. Thanks to his efforts, amateur (and professional!) enthusiasts have now the possibility to perform measurements that were reserved to well-funded HF laboratories before. In this video, Tom explains the evolution and capabilities of his VNWA and why even NASA relies on it now as well! The presentation was held during the Ham Radio Hamfest in Friedrichshafen, Germany in June 2012.

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Author's picture

Tobias Wellnitz, DH1TW


Software Engineer

Germany