A Growing Concern
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 [...]
I've been gardening in Oregon for a few years now, and I'm coming to appreciate evermore the humble fava bean. The first time I encountered it was in a cover crop seed mix that I got at the local garden store. I started using "field favas" and crimson clover as standard fare to plant in [...]
Simple pieces of wire are not the most sexy ham radio antennas, but they are probably the most ubiquitous, if for no other reason than that their cost-performance ratio is very good. When it comes to the lower bands, there is little else that is more practical for most of us than using a wire [...]
Overview Previously we looked at some of the basic principles of nervous system function and how chemicals from several pesticide classes disrupt normal function. This time we will look in detail about what we can expect for a dose-response characterization of acetylcholine pathway insecticides based upon their mode of action and properties of the nervous system. [...]
I've been slow getting things on the blog for a while now; from September... The DateTrike returned for its second trip to Black Rock City again this year. With smoke in the valley, we headed for the dust. It was a fun time, as is usually the case for the world's biggest art party. We [...]
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. [...]
Squash Practice 