An Optimized 20 Meter Vertical Collinear Antenna

After a few months of pondering how to build a simple pull-up vertical collinear antenna, I think I've finally got it!  The motivation for such a design is the fact that I have tall trees for a support and can actually pull such an antenna up into the trees to 100 ft. or even higher.... Continue Reading →

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A Simple Pull-up Mono-Band Verticle Dipole Antenna Design – and 4NEC2 Tutorial

I have a nice off-center-fed dipole (OCFD) antenna that is my mainstay for multi-band HF work, but I would like to understand it better.  With a wire antenna tied to trees it is not a simple matter to quantitatively determine the antenna's radiation pattern experimentally.  One way to get a handle on this is to compare... Continue Reading →

RTL-SDR Pan-adapter using HDSDR with the IC-751A

There is little doubt that the RTL-SDR tuner dongle radio receivers are the hottest new thing for the amateur radio experimenter.  Re-purposing the $10 tuner dongle to be an extraordinarily wide-band software defined radio is the subject of countless internet articles and videos.  Here I am adding my experiences to the crowd.  What I will describe... Continue Reading →

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