Chordal Hop Propagation
Understand how efficient ionospheric skip can occur without ground reflection.
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Bob KØNR
Intro to Digital Voice
DSTAR, DMR, System Fusion... Get some clarity on digital voice modes.
837 views
Stu WØSTU
Field Day Weekend! What's it all about?
It's Field Day weekend! Find your local field day event and have fun with hams. Here's what it's all about.
402 views
Bob KØNR
Get the Right Signal Tone
DTMF, CTCSS, DCS, Tone Burst... What are they and which do you need for a given situation? Learn about the variety of signal tones.
9,775 views
Bob KØNR
Simplex, Duplex, Offset and Split
Learn the differences among these operating modes and terms, and understand typical operating conditions for each.
10,510 views
Bob KØNR
What Frequency Do I Use on 2 meters?
Learn how to stick to the voluntary band plans on 2-meters and avoid interference.
32,971 views
Stu WØSTU
Standard 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...
3,915 views
Bob KØNR
Hey, Which Coaxial Cable Should I Use?
A comparison of common ham radio coaxial cable types and signal loss.
23,943 views
Stu WØSTU
Sunspots and Propagation
The new solar cycle is rising! Learn why sunspots are of great interest to ham operators.
6,046 views
Bob KØNR
Working DX
Contest weekend? Learn common contest practices and how to snag DX stations.
1,019 views
Stu WØSTU
Op Amps (E7G12)
The 2020-2024 Extra License question pool wants to ensure you know a thing or two about operational amplifiers, an analog integrated...
266 views
Stu WØSTU
Part 15 Devices
Part 15 of Title 47 of the Code of Federal Regulations regulates low power, unlicensed devices that can cause interference on the ham...
211 views
Stu WØSTU
Spectrum Analyzer (E4A02)
The spectrum analyzer provides a frequency domain view of signals, while an oscilloscope displays the time domain. Learn the difference.
678 views
Stu WØSTU
Liquid Crystal Displays
Ever wonder how that LCD on your radio works? Get the fundamentals on liquid crystal display functionality.
203 views
Stu WØSTU
Vacuum Tubes (G6A10)
Get amped up on vacuum tubes' structure and function with this question pool item.
608 views
Stu WØSTU
Bleeder Resistors (G7A01)
The 2019-2023 General License question pool requires that you understand the purpose of a power supply bleeder resistor: G7A01: What...
173 views
Stu WØSTU
Transformer Windings Diameters (G5C16)
Transform your understanding of transformers and their wire windings.
308 views
Stu WØSTU
Transformers (G5C06)
The 2019-2023 General License question pool includes questions about the function of electrical transformers: G5C06: What is the RMS...
330 views
Stu WØSTU
Capacitive Reactance (G5A06)
Understand the dynamics of capacitive reactance - how AC reacts to a capacitor.
265 views
Stu WØSTU
Complex Impedance Part 3: Putting It All Together
In Part 1 of this series, Just a Passing Phase, we defined the sine waveform of the most common AC signals, illustrated how AC voltage...
1,232 views
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