A curated collection of in-depth technical articles covering the essential systems of the amateur radio station — written for licensed operators at every level.
The Amateur Radio Service is unlike any other radio service administered by the FCC. It exists not for commercial broadcast, not for government operations, but as a volunteer, non-commercial communication service operated by licensed private citizens for technical experimentation, public service, and emergency communications. This article covers the full picture — how the FCC allocates spectrum across dozens of radio services, where the ham bands sit within that landscape, what FCC Part 97 actually says about the purposes of amateur radio, and how the three-tier licensing structure works. Whether you're newly licensed or explaining the hobby to someone who isn't, this is the definitive starting point.
Read Full Article →A typical 100-watt HF transceiver draws more than 20 amperes on transmit — a load that demands a power supply worthy of the task. But which architecture deserves a place in your shack: the time-tested linear supply with its massive transformer and whisper-quiet output, or the compact, lightweight switch-mode supply that delivers comparable current at a fraction of the size and cost? The answer is less straightforward than the amateur radio community's conventional wisdom suggests. This article examines both designs from the ground up — how they work, where they excel, where they fall short, and what the FCC emissions regulations actually say about the HF noise that switch-mode supplies are notorious for generating. The numbers may surprise you.
Read Full Article →The antenna is the single most consequential component in any amateur radio station — more impactful on real-world performance than any other equipment decision, including transmitter power. This article begins with the physics of electromagnetic radiation and the wavelength-frequency relationship that governs antenna dimensions, then works through eight antenna designs in common amateur use: dipoles, verticals, Yagi-Uda arrays, Hexbeams, log-periodic arrays, quad antennas, loop antennas, and end-fed designs. Each is examined for its radiation pattern, gain characteristics, practical installation requirements, and the operating scenarios it serves best. Understanding these trade-offs is the foundation of every effective station build.
Read Full Article →Few topics in amateur radio generate more confidently stated misinformation than antenna tuners and SWR. Does reflected power really burn up the finals? Is 1:1 SWR always the goal? Does a high SWR mean significant power loss? Does an antenna tuner actually tune the antenna? The answers to all four questions will likely challenge what you think you know. This article works through the underlying physics of impedance matching, explains what antenna tuners actually do and — critically — what they cannot do, addresses four persistent SWR myths with technical precision, and examines why tuner placement in the station has real consequences for feedline stress and system efficiency. Manual vs. automatic tuner trade-offs are covered in full.
Read Full Article →Running legal limit power is a legitimate operating goal — but understanding what that power actually buys you on the receiving end is essential before making the investment. The decibel math is unforgiving: going from 100 watts to the FCC limit of 1,500 watts yields approximately two S-units of improvement at the receiving station. That's meaningful — but a modest antenna improvement delivers equivalent gain in both directions simultaneously. This article covers why linear amplification is required for SSB and other amplitude-varying modes, how amplifier classes (A, AB, B, and C) differ in linearity and efficiency, the genuine trade-offs between tube and solid-state designs, and the pre-purchase checklist every operator should work through before adding an amplifier to the station.
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