Shaun Merrigan
Classic Electronic Restoration, Vacuum Tube Audio, Technical History, Photography
Tag: Shaun Merrigan
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An aeronautical Non‑Directional Beacon (NDB) is a ground‑based radio transmitter that sends out a continuous signal in all directions, allowing aircraft equipped with Automatic Direction Finders (ADF) to determine their bearing relative to the station. It’s one of the oldest forms of radio navigation—simple, rugged, and still used worldwide despite the rise of GPS and…
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These data comprise my FT8 receive only logs from about 2022 until now. These logs were collected using my local KiwiSDR and an LZ1AQ loop antenna. The statistics were generated using Microsoft SSMS and SQL using my data extracted from SWLog. (Thanks Robert Sillett). Effort was put into sanitizing, de-duping, and ensuring that only one…
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I have been testing my Aziloop DF-72 loop antenna system since late June 2026. The statistics were generated using Microsoft SSMS and SQL using my data extracted from SWLog. (Thanks Robert Sillett). The idea for the summary statistics came from Loyd Van Horn at DXCentral (Thanks Loyd). Click on any of the images to display…
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The Roetest Tube Tester stands out as one of the most capable and thoughtfully engineered modern instruments available to anyone working with vacuum tubes. Designed by Helmut Weigl, it bridges the gap between classic tube‑era test gear and contemporary measurement practice: fully automated, PC‑connected, and able to characterize tubes with a level of precision that…
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As of this writing (May 2026) AI Assisted Coding is it’s infancy. However the tools are available and very competent, given proper direction. Over the past few weeks, I have used Claude Code to help write control, logging and calibration applications for the following instruments: My goal as I approached this was to come up…