MarME

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  • Restoring an HP 8591E Spectrum Analyzer

    © 2025 MarME — Marco’s Measurement Equipment Background When I bought my HP 8591E spectrum analyzer it came with a warning:It works — but only if you leave Option 130 (the narrow-bandwidth IF) disconnected. Oh and it has a strange glitch in the amplitude – as the previous owner told me.That The Option 130 board…

  • GPSDO

    An overview of the GPSDO project Building a GPS-Disciplined Oscillator (GPSDO) Background and inspiration A GPS-Disciplined Oscillator combines a local high-stability oscillator (typically an OCXO) with the long-term accuracy of GPS time.Over the years, many excellent DIY versions have appeared; the two I learned the most from were: My build followed Lars’ architecture most closely.…

  • Low resistance metrology

    How a Marktplaats find sparks doubt about accuracy. © 2025 MarME — Marco’s Measurement Equipment Background I recently found two vintage Bleeker precision resistors on Marktplaats: a 0.1 Ω ±0.01% and a 0.01 Ω ±0.01% model. After some doubt I had to get them, Bleeker to me feels like a long gone pinnacle of Dutch…