# Videos of measuring a cavity resonance in the lab

**URL:** https://forum.kavli.tudelft.nl/t/videos-of-measuring-a-cavity-resonance-in-the-lab/107
**Category:** Electronics / Electrical equipment and measurement
**Created:** [18 June 2020 18:29 UTC](https://forum.kavli.tudelft.nl/t/videos-of-measuring-a-cavity-resonance-in-the-lab/107 "2020-06-18T18:29:51Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![gsteele13](https://forum.kavli.tudelft.nl/letter_avatar_proxy/v4/letter/g/3d9bf3/32.png) [@gsteele13](https://forum.kavli.tudelft.nl/u/gsteele13)
#### Post date: [18 June 2020 18:29 UTC](https://forum.kavli.tudelft.nl/t/videos-of-measuring-a-cavity-resonance-in-the-lab/107/1 "2020-06-18T18:29:51Z")

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Some videos of myself playing with VNA in the lab measuring a microwave resonance using a room temperature 3D cavity

[https://www.youtube.com/playlist?list=PLIWwgYtvRAcojr4XLVimSo3IBJyHSLoE-](https://www.youtube.com/playlist?list=PLIWwgYtvRAcojr4XLVimSo3IBJyHSLoE-)

Some fun things to learn:

- How to properly set the electrical length setting of your VNA to compensate a running phase
- How to make bad cable resonances using an SMA tee 🙂
- Example of how it is difficult to determine the internal Q with fano resonances
- How this gets even trickier if you are less coupled (which surprised me)
- How replacing the tee with a directional coupler helps tremendously

Useful to combine with this post:

[Crosstalk and "Fano lineshapes" in microwave resonator measurements](https://forum.kavli.tudelft.nl/t/crosstalk-and-fano-lineshapes-in-microwave-resonator-measurements/102/17)

Enjoy!

Cheers,  
Gary