HP 8563A Spectrum Analyzer Rebuild – Part 3: Fixing the Attenuator & YTF Recalibration

Описание: After successfully reviving the HP 8563A with a new OCXO, the next challenge is repairing the faulty attenuator—a critical step before full recalibration. In this episode, I dismantle, repair, and test the attenuator, then dive into YTF recalibration to fix a 52 MHz frequency shift! But will everything work perfectly? Spoiler: almost!

What’s in this video?
✅ Step-by-step attenuator repair (yes, including the "butchering" moment!)
✅ Diagnosing high-frequency band issues (Is it the RF switch or the YTF?)
✅ Recalibrating the YTF using a power meter, frequency counter, and spectrum analyzer
✅ Testing results at 3 GHz, 10 GHz, 15 GHz, and 20 GHz
✅ Preparing for the grand finale

Why does this matter?
The HP 8563A is a legendary piece of test equipment, and restoring it to full functionality is a challenge worth sharing. Whether you're into RF engineering, vintage electronics, or DIY repairs, this series offers practical insights into spectrum analyzer calibration and troubleshooting.

Tools & Equipment Used:

HP 8563A Spectrum Analyzer (the star of the show!)
MS710A Spectrum Analyzer (for cross-verification)
HP 432A Power Meter + 8478B Sensor (for precise measurements)
EIP 548A Frequency Counter (to combat drift)

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Credit:
Intro/Outro: Jason Farnham - Microchip ( • Microchip - Jason Farnham )