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, August 24, 2018

Preventing a GFCI from tripping on transmitted RF

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Figure 1: The installed GFCI (and chokes) in the utility room/laundry room. Click on the image for a larger version. Several months ...

5 comments:

Monday, June 18, 2018

A limited attenuation high-pass filter for the KiwiSDR

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NOTE: Figure 1: Inside the "limited attenuation" high pass filter, housed inside a small, die- cast aluminum enclosure to whi...

Thursday, May 31, 2018

A "floaty thingie" for keeping NiHM cells topped off

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A charge-state maintenance device for NiMH cells PLEASE NOTE: Messing about with bat...

Tuesday, April 24, 2018

Pine needle what? (Keeping your coniferous antenna supports alive!)

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The afflicted tree: The needles are more normal at the top, but looking rather "thin" farther down. Because of the number of ...

2 comments:

Tuesday, February 20, 2018

Better frequency stability for the QRP Labs "ProgRock" synthesizer

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NOTE: The Progrock 2 from QRP-Labs has replaced the original ProgRock. This device has a 0.25ppm TCXO, eliminating the problems noted below...

2 comments:

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