I was curious if the performance of our 4O3A high-power Bandpass filters could be improved with additional coax stubs in parallel. We were operating at ED1R for some time now with the added stubs, and we are pleased with the results. Check out the details!
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.
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!
At our Contest Station ED1R, we have on each highband 3 Yagis available. In 2012 I built 4 high-power Stackmatches to switch and combine them properly. Since I never liked the way of WX0B’s stackmatch controllers with the rotative knob, a microcontroller and button-based solution were the answer. After a few contests, the solution has proven its reliability and comfort.
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.