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measuring crystals


Randy True 2020/12/09 16:54

Watched a couple youtube videos on measuring crystals with the VNA. While the cable hookups were fairly clear, the settings used were not. What parameters are used in the dropdown menus?


Randy W4RTT

John Gord 2020/12/09 13:02

Randy,
I am not familiar with the videos, but the following website:
https://ojisankoubou.web.fc2.com/nanovna/nanovnav2.html
has both V2 firmware suitable for narrowband crystal measurements and a description of the crystal measurement method. (Use Google translate).
Note that narrow bandwidth settings are needed due to the slow response (narrow bandwidth) of the crystal itself.
--John Gord

On Wed, Dec 9, 2020 at 08:54 AM, Randy True wrote:

Alan “W2AEW” Wolke 2020/12/10 08:20

Did you watch my video?
https://www.youtube.com/watch?v=G9zZRNzhsEE

Randy True 2020/12/11 12:26

Yes, I did watch your video. If I had taken a college course in algebra, I may have been able to comprehend what I was looking at. I appreciate your effort, but it was mostly lost on me.
Simplify this for the basic math guy. I want to connect a crystal to the test lead (s), go to the menu and select a parameter that will give me a read out as to what the frequency of the crystal is. Form what I have seen on the videos, this is possible, but none have shown what to set the menu items to.


Randy W4RTT

Karl Jan Skontorp 2020/12/11 07:15

These two links may be useful for you
https://www.mikrocontroller.net/attachment/195160/Crystal_Motional_Parameters.pdf
https://www.nonstopsystems.com/radio/pdf-ant/antenna-article-xtal-1cqp.pdf
There is a lot of math in the first one, but I suppose you can sort out the information you want. I have not tried to measure the motional parameters of a crystal with the NanoVNA, but I hvae done it with a miniVNA Pro some time ago... You get two "spikes", one is the serial resonance frequency and the other one is the paralell resonance point, if I remeber right... The last link will give you an indication of the settings....

Karl Jan - La3FY

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