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, December 25, 2025

Neon bar-graph VSWR/Power meter using the ИН-13 (a.k.a "IN-13") "Nixie" - Part 3 (of 3)

Figure 1: Power/VSWR meter using ИН-13 neon bar-graph indicators. This was taken prior to installing the dark plastic to improve contrast ...

Thursday, November 27, 2025

Adding ALC and overdrive protection to the MFJ ALS-500M "500 watt" amplifier

Figure 1: The ALS-500M front panel. Because this this unit is equipped with the 10 meter low-pass filter, the "AUX" position on t...

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