KA7OEI's blog

Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei.com and modulatedlight.org

Thursday, October 31, 2024

Hiking and POTA (Parks On the Air) operation from Arches National Park (US-0004)

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Figure 1: Double-O Arch Click on the image for a larger version. Earlier this month I had the opportunity to spend nearly a week in Arches N...
Monday, September 30, 2024

Neon bar-graph VSWR/Power meter using the ИН-13 (a.k.a "IN-13") "Nixie" - Part 2

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Figure 1: Power/VSWR meter using ИН-13 neon bar-graph indicators. Click on the image for a larger version In Part 1 (link) I laid out the ...
Wednesday, August 28, 2024

Neon bar-graph VSWR/Power meter using the ИН-13 (a.k.a "IN-13") "Nixie" - Part 1

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Figure 1: Power/VSWR meter using ИН-13 (a.k.a. "IN-13") neon bar-graph indicators. Click on the image for a larger version. (Be...
Wednesday, July 31, 2024

Rewinding the stainless steel coils with silver-plated copper wire on the JPC-7 and JPC-12 antennas

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Portable antennas (verticals, loaded dipoles) typically use coils on the lower HF bands to make them electrically "larger" to alo...
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