A Growing Concern
I've been using a spool of RG-6 CATV cable of dubious quality for quite a while as my go-to source of antenna feed line because I happened to have the spool in my junk collection. Using the 75 Ω cable got me thinking about why we care what impedance the cable is and how matching [...]
We have entered the age of "pretty smart" machines. There have been some showpieces in the form of Jeopardy's Watson and recently the game playing AlphaGo and AlphaZero machines that far and way bested the best human players at their game. Notably, unlike previous game playing machines, AlphaZero was never programmed on how to play [...]
Here are the slides for a presentation given to The Valley Radio Club on May 3, 2019. The hope is that the slides contain enough detail that the reader could easily build and run the examples in 4NEC2. Practical Antenna Modeling Power Point Presentation Practical Antenna Modeling PDF format slides Using the NEC Codes With Examples [...]
When I first started playing ham radio, I ran across the GR5V antenna. It seemed that a lot of folks had them, and there seemed to be a fair bit of controversy about how good/bad they were. For whatever reason, I bypassed the design and went to an off-center-fed dipole instead. Now with more experience [...]
The world is in the midst of an insect extinction crisis. We've all heard about the plight of bees, but the plight of all insect fauna is much less widely appreciated. The figure below is from a report in Science a few years ago showing the precipitous decline in insects worldwide.[1] What beekeepers and naturalists [...]
I only recently ran into metamodernism, the new kid on the block ready to sweep postmodernism into the dust bin of intellectual movements. This isn't my usual bailiwick, so it took me by surprise that I was pulled into this obscure corner of cultural criticism. What's brought me here is the paucity of reasonable discussion these [...]
If you wish to move your playing up the neck of the instrument, these scales, starting with a few tonic bar chord shapes, will help you to learn the changes required to play in many keys. Below are five "home" positions with changes for a complete chord scale about that home position. Major scale with [...]
