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…
Radio Science (21)
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…
Liquid Crystal Displays
Liquid-crystal display on Icom IC-7100 transceiver, incorporating touch screen controls. (Courtesy Icom America) If you have never seen a liquid-crystal…
RMS Voltage (G5B09)
The 2023-2027 General License question pool requires you to compute RMS voltage from peak voltage in an AC sine wave…
D-layer Absorption
We learn in Technician Class and General Class studies that the ionosphere’s D layer is created in the daytime by…
