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, May 27, 2026

Replacing the relays in the Yaesu FT-480R (FT-280)

tl:dr: Figure 1: The front panel of my "FT-280R" all-mode 2 meter transceiver including paper labels showing the "new" m...

Saturday, April 11, 2026

A (simple) WWVB loop amplifier for radio-controlled clocks

Note: The techniques described below should work - with only minor adaptation - for any "Longwave" time signal used by these radio...

Wednesday, March 18, 2026

Repairing a ("smoked") MFJ-998 1.5kW automatic antenna tuner

Figure 1: The (repaired) MFJ-998 front, now working, sitting atop my Heathkit SA-2060 manual tuner and underneath my homebrew neon bar-graph...

Wednesday, March 4, 2026

Modifying the MFJ-5008 parabolic ultrasonic receiver for better sensitivity and wider frequency response

Figure 1: Front view MFJ-5008 parabolic dish with integrated microphone and receiver (located on the back side). Click on the image for a la...

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