Designing Self Resonant Coils for Antenna Traps and Chokes

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 [...]

COVID-19 Leadership Matters – A Tale of Two States

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 [...]

Quick COVID-19 Math

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 [...]