[time-nuts] Are there SC-crystals out there in the wild that are not Overtone?

[Bernd Neubig]

 I am glad you could confirm my rough estimate.
The critical point when measuring SC-cut crystals at room temperature is, that their f(T) response is rather steep at room temperature. There even minor temperature variations during the sweep (or between two sweeps) will cause a shift of the impedance response.
This is the reason for the small edge at the left side of Gerhard's picture.
Best regards
Bernd

-----Ursprüngliche Nachricht-----
Von: time-nuts [mailto:time-nuts-bounces at lists.febo.com] Im Auftrag von Gerhard Hoffmann
Gesendet: Freitag, 28. Februar 2020 16:44
An: time-nuts at lists.febo.com
Betreff: Re: [time-nuts] Are there SC-crystals out there in the wild that are not Overtone?


...

But Bernd was very precise with his prediction where the fundamental

of the SC crystal was to be expected. The sweep took abt. 25 minutes @ 1Hz RBW.

The step on the left side is where the next measurement happens.

The crystal laid openly on the end of the port cable on the table at 
room temperature.

--- <  fundamental.png > ---