Month: May 2023
What Is Concrete?
Concrete is an artificial composite material made from a binder (typically cement) and aggregate, a dispersed phase of crushed rocks or sand that "glues" the matrix together. Its strength, density and chemical resistance are determined by the type of aggregate used and the formulation of the binder. Concrete can be poured, pumped, sprayed and grouted…
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How to Tune a Ham Radio Antenna
Antennas are resonant devices, which means they work best at one frequency. The goal is to make the antenna usable across the entire band for which it is designed. This is accomplished by tuning the antenna to be resonant at the desired frequency. It is important to do this in the field, simulating real world…
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