Bob KØNRGet the Right Signal ToneDTMF, CTCSS, DCS, Tone Burst... What are they and which do you need for a given situation? Learn about the variety of signal tones.
Bob KØNRSimplex, Duplex, Offset and SplitLearn the differences among these operating modes and terms, and understand typical operating conditions for each.
Bob KØNRWhat Frequency Do I Use on 2 meters?Are you complying with the 2-meter band plan? Learn how to stick to the agreed plans on 2-meters and avoid interference.
Stu WØSTUStandard Phonetic Alphabet (T2C03)T2C03 from the 2018-2022 Technician License Course Section 2.3, Call Signs: T2C03: What should be done when using voice modes to ensure...
Bob KØNRHey, Which Coaxial Cable Should I Use?A comparison of common ham radio coaxial cable types and signal loss.
Stu WØSTUSunspots and PropagationThe new solar cycle is crazy active! Learn why sunspots are of great interest to ham operators.
Bob KØNRWorking DXOne way to work a lot of DX on a weekend is to participate in a DX contest on the high frequency bands. For example, the CQ Worldwide DX...
Stu WØSTUOp Amps (E7G12)The 2020-2024 Extra License question pool wants to ensure you know a thing or two about operational amplifiers, an analog integrated...
Stu WØSTUPart 15 DevicesPart 15 of Title 47 of the Code of Federal Regulations regulates low power, unlicensed devices that can cause interference on the ham...
Stu WØSTUSpectrum Analyzer (E4A02)The spectrum analyzer provides a frequency domain view of signals, while an oscilloscope displays the time domain. Learn the difference.
Stu WØSTULiquid Crystal DisplaysEver wonder how that LCD on your radio works? Get the fundamentals on liquid crystal display functionality.
Stu WØSTUVacuum Tubes (G6A10)The 2019-2023 General License question pool asks about the inner workings of vacuum tubes used as amplifiers: G6A10: Which element of a...
Stu WØSTUBleeder Resistors (G7A01)The 2019-2023 General License question pool requires that you understand the purpose of a power supply bleeder resistor: G7A01: What...
Stu WØSTUTransformer Windings Diameters (G5C16)The 2019-2023 General License question pool asks about the diameters of transformer windings, comparing primary to secondary: G5C16: Why...
Stu WØSTUTransformers (G5C06)The 2019-2023 General License question pool includes questions about the function of electrical transformers: G5C06: What is the RMS...
Stu WØSTUCapacitive Reactance (G5A06)The 2019-2023 General License question pool asks about capacitive reactance: G5A06: How does a capacitor react to AC? A. As the frequency...
Stu WØSTUComplex Impedance Part 3: Putting It All TogetherIn Part 1 of this series, Just a Passing Phase, we defined the sine waveform of the most common AC signals, illustrated how AC voltage...
Stu WØSTUComplex Impedance Part 2: Reacting Nicely!In Part 1 of this series, It’s Just a Passing Phase, we defined the sine waveform of the most common AC signals, illustrated how AC...
Stu WØSTUComplex Impedance Part 1: Just a Passing PhaseOne of the more advanced topics in amateur radio electronics, and one that is often difficult for students to fully grasp, is complex...
Stu WØSTUSemiconductor MaterialsUnderstand the basic science of semiconductor materials from which myriad electronic devices are made.