A Growing Concern
A lowly coil of wire can be surprisingly difficult to understand and model correctly. I use coils of wire or coils of coax cable as trap inductors for various antenna designs that I have built. In the low frequency limit, the traditional inductance calculations work okay and can give you a pretty good estimate of [...]
When you first meet the J-Pole, you are forgiven if you don't quite grok how it is supposed to work. What is that 'J' for anyhow? When I have questions like this, I get out the 4NEC2 modeling program, and see what it says. Let's start out with the basic model -- the J consisting [...]
The bamboo Moxon I built for the 20 meter band earlier this summer convinced me of the power of compact two element antennas. When I was showing the Moxon to a friend, he pointed up to a nearby tree and said "There's the place to pull from," pointing to the crotch of a tall branching [...]
A couple of years ago I designed this antenna which had the good property of substantial low elevation gain and the model generated consistent and predictable 4NEC2 results. The wire that it would replace was already "pretty good" so it's taken two years to decide to build it. But I always had the feeling that [...]
As much as I love all of the wires up in my trees, I've come to realize that a little real gain and directivity would be nice. However, my trees are really in the way for a a typical tower and a beam antenna, so I am left to consider what resources I have and [...]
June 1st is a pretty good date to pick for the beginning of the main honey flow in our area. There are early nectar sources such as Big Leaf Maples, Dandelions, and fruit trees which come earlier, but the weather is not yet cooperative and the hives are not as developed yet. By June 1st [...]
Oregon is one of the states with the lowest per capita COVID-19 infection rates. However, despite our best efforts, we are still seeing about 50 new cases per day (down only a little from a high of about 70 cases per day five weeks ago). Nothing much has changed for the last two or three [...]
The response to the COVID-19 crisis has varied from state to state depending on the perceived need for aggressive action and depending on political considerations in our divided nation. As a result, the United States offers 50 simultaneous experiments in epidemiological response, often with dramatically different initial conditions, such as the high population density and [...]
Due to the scarcity of tests across the country, hospitals usually only test those cases that they need to admit to the hospital. The hospitals are not testing the majority of people complaining of symptoms, nor the many possibly infected asymptomatic people. We need to keep this fact in mind when looking at the statistics [...]
The cognitive disconnect is extreme. Beautiful March sunshine, flowers in bloom, the bees, buzzing in anticipation of a new season. Shuttered businesses, empty grocery shelves, shelter-in-place orders and lock-downs around the country, all in preparation for the onslaught of an invisible enemy. A liar in chief tries to turn a catastrophe to his personal advantage. [...]
