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. No AI is used to generate this content.

Friday, October 20, 2023

Multi-band transmitter and monitoring system for Eclipse monitoring (Part 1)

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It should not have escaped your attention - at least if you live in North America - there there have been/will be two significant solar ecl...
Tuesday, October 17, 2023

Remote (POTA) operation from Canyonlands National Park (K-0010)

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As I am wont to do, I recently spent a week camping in the "Needles" district of Canyonlands National Park.  To be sure, this was ...
Sunday, October 1, 2023

Resurrecting my FE-5680A Rubidium frequency reference

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Fig 1: The Hammond 1590 aluminum case housing the FE-5860A rubidium osc- oscillator and other circuitry - the markings faded by time and hea...
Monday, September 4, 2023

Measuring signal dynamics of the RX-888 (Mk2)

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As a sort of follow-up to the previous posting about the RX-888 (Mk2) I decided to make some measurements to help characterize the gain and ...
Tuesday, August 29, 2023

Improving the thermal management of the RX-888 (Mk2)

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Figure 1: The RX888 showing the "top" and RF connectors.  While the heat sinks attached to the sides are visible, the large one on...
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