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

Wednesday, September 10, 2025

DXing distant SolarEdge PV optimizer modules (or long-distance propagation of PV system QRM)

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From how far away can you hear the spurious emissions from a known-noisy PV system? Quite a racket! Figure 1: The spectrum of a SolarEdge P...
Sunday, August 24, 2025

Exploring the Ameco PCL-P Nuvistor cascode preamp/preselector

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"And now, for something completely different!" This past January - at Quartzfest - there was a table covered with "junque...
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Monday, July 28, 2025

Reducing RF susceptibility for the HamGadgets "Ultra Pico Keyer" - and mimizing RF issues on portable HF stations in general

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Note: While this article describes a modification of the Pico Keyer to reduce RF susceptibility, it also talks about methods to minimize/red...
Friday, June 13, 2025

A 15 (and 10) meter high-pass filter for Field Day

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QRM from a transmitter to receivers on lower bands [Go to the end of this article for an "After-Field-Day follow-up" about this f...
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