Category Archives: Test Equipment

Calibrating a Radio Duplexer Using a Vector Network Analyzer (VNA)

Posted on January 12, 2025 by Daniel

This guide outlines the process of calibrating a radio duplexer to ensure optimal performance by minimizing insertion loss, maximizing isolation, and achieving proper frequency separation. Continue reading →

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Happy happy. With my new Vector Network Analyser: the LibreVNA

Posted on January 11, 2025 by Daniel

After having used the amazing VNWA3SE Automatic 2 Port VNA from DG8SAQ for several years now, I needed an upgrade to be able to better calibrate my antenna duplexer. After reasearching quite a bit I found the LibreVNA, a 100khz-6Ghz … Continue reading →

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Repairing a Rohde & Schwarz SMDU

Posted on January 6, 2024 by Daniel

From a good friend I was given a Rohde & Schwarz SMDU which needed some love and care. Martin, DL8RI, did a phenominal job in documenting his SMDU repair work on this website: I followed a lot of the work … Continue reading →

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