Ham Radio School

A 3-part examination of complex impedance.

Understand the basic science of semiconductor materials from which myriad electronic devices are made.

Learn to calculate power use for DC circuits based upon voltage and load resistance.

The 2019-2023 General License question pool requires you to compute RMS voltage from peak voltage in an AC sine wave voltage: G5B09: What...

The 2019-2023 General License question pool asks for the definition of zero beat as applied to CW operations: G2C06: What does the term...

You’ve probably heard the term “Q factor” tossed around in describing antennas, but maybe you haven’t quite yet picked up on exactly what...

Learn more about the log periodic antenna's distinct advantages and unique design.

Learn a bit of the history and the functionality of the popular Yagi directional antenna.

Intuitively grasp how dipole antenna feedpoint impedance is related to voltage and current in the antenna.

Understand the difference between these common references for antenna gain.

The 2020-2024 Extra License question pool asks for the definition of direct digital conversion in a software defined radio: E7F01: What...

The 2023-2026 General License question pool requires the use of Carson's Rule to estimate the bandwidth of an FM phone transmission:...

The 2020-2024 Extra License question pool asks a deep question about DX techniques requiring some good knowledge of propagation science:...

Learn why the ionosphere's D layer tends to absorb lower HF significantly, and the relationship to NVIS ops.

The 2019-2023 General License question pools includes a question about the type of encoding used with the PSK31 digital mode: G8C08:...

The 2019-2023 General License question pool touches on the digital mode concept of the automatic repeat query, or ARQ: G8C07: How does...

For clear communications under all conditions, we use a phonetic alphabet for spelling out critical information. Instead of “A B C”, we...

The 2019-2023 General License question pool asks about the maximum allowable height of antenna structures without requiring special...

Operating on the high frequency (HF) ham bands in the 3-30 MHz range is markedly different from typical VHF/UHF ops. Learn what to expect.

What is meant by split mode? See how split mode helps DXers.