I agree that your measurements are trustworthy and so the diodes are indeed the main suspect.
Dave Wise’s suggestion of a BAT62 is a great one if you don’t mind a breakdown voltage that is a bit less than the spec’d allowable input voltage.
And they’re more readily available than the original through-hole parts.
Tom
Sent from an iThing; please forgive the typos and brevity
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On May 6, 2024, at 11:09, jmr via groups.io <jmrhzu@...> wrote:
?I'm using an Agilent E5071B VNA and a decent cal kit and I use the fixture simulator feature in the VNA to correct for the fixture. I normally do this stuff up to many GHz so I think the fixture is fine.
