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.

Sunday, October 27, 2019

Shunt regulation of series-connected lead-acid batteries to equalize the voltage

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There are many instances where series lead-acid batteries are connected - including: 12 volt systems using two 6 volt "golf cart...

Monday, September 30, 2019

A LiIon Pack for the Yaesu FT-530 - and (possibly) other older handie-talkies (HTs).

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Since the mid 1990s my "go to" handie-talking has been the venerable Yaesu FT-530. Fairly popular at the time, this radio has end...

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Wednesday, August 14, 2019

Revisiting the limited attenuation high-pass filter for the KiwiSDR (or SDRPlay, RTL-SDR Dongle, Fun Cube, or other SDR receivers)

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In the June 18, 2018 entry of this blog ( see that page here ) I described a device that reduced the lower-frequency (below approximately 1...

Sunday, June 9, 2019

Using the same feedline for HF/6 meters and 2 meters/70cm (with a diplexer)

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Yesterday, a work party went to the remote HF station of the Utah Amateur radio club to install a new antenna for the lower HF bands. At th...

Friday, May 31, 2019

Revisiting the 20 meter "helical resonator" band-pass/notch filters

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In my June 30, 2014 blog entry ( linked here ) I described simple band-pass and band-stop filters that could offer a degree of isolation b...

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