VHF Multipath: More Than One Signal Path
Multipath distortion is a common phenomenon that I've become accustomed to living in a mountainous region. It can mess up…
Radio Science (24)
Semiconductor Materials
Many modern electronic components are manufactured from semiconductor materials. A semiconductor material has an electrical conductivity somewhere between a great…
Speed of Propagation (T3B11)
The technician question pool (2018-2022) item T3B11 asks: What is the approximate velocity of a radio wave as it travels…
Time & Frequency Domain Signal Views
At Ham Radio School we really believe in the old adage that a picture is worth a thousand words. Visualization…
Sunspots and Propagation
Here comes the sun! Solar cycle 25 is ramping up beyond expectations at this point in early 2023. The sun…
Variable Propagation Conditions (G3A10)
The 2023-2027 General License question pool inquires about factors effecting propagation of HF signals: G3A10: What causes HF propagation conditions…
Chordal Hop Propagation
Amateur radio operators communicate around the globe on the HF bands thanks to signals propagating by ionspheric skip. High layers…
Spectrum Analyzer (E4A02)
The 2020-2024 Extra License question pool asks you to identify characteristics of a spectrum analyzer, a common RF engineering signal…
