[time-nuts] Old Crystal.

[Alex Pummer]

  Using the DG8SAQ Vector Network Analyzer to identify an unknown component


https://www.youtube.com/watch?v=Ao653tz1kVE

actually it has a special program made for analyzing crystals

Greetings
and 73
KJ6UHN
Alex

On 3/1/2021 12:32 AM, Magnus Danielson wrote:
> Hi,
>
> On 2021-03-01 01:23, Attila Kinali wrote:
>> On Sun, 28 Feb 2021 18:35:57 -0500
>> Dan Kemppainen <dan at irtelemetrics.com> wrote:
>>
>>> If any of you have any suggestions on where to find information on how
>>> to get something like this to oscillate properly, guess at correct
>>> parameters, or even measure any of the parameters I would really
>>> appreciate it.
>> The best way would be to use a network analyzer and measure
>> the crystals LCR parameters. Using that you can use the
>> standard harmonic oscillator literature (Parzen, Frerking,...)
>> to design the circuit.
>>
>> I seem to have misplaced my literature on how to measure
>> crystal oscillators. But if you search for "Neubig" and
>> "crystal measurement", you should be able to find some of
>> the nice documents that Bernd Neubig has written on the topic.
> The same Neubig made a comment that your normal network analyzer isn't
> such a good tool, even a very good one. The reason being you need both a
> wide and narrow sweep to make the model values accurate enough. Most
> network analyzers achieve the wide sweep, few do the narrow sweep and
> then having that combined to fill in the LCR parameters of a suitable
> model, not so much. Things you learn by eating breakfast with him. Turns
> out that my network analyzer is good for the measurement, but not for
> model fitting.
>
> Neubig have been very much involved in standardizing measurements, and
> doing those well to characterize accurate enough those high-Q resonators
> have it's challenges that leads many efforts into incorrect values.
>
> Cheers,
> Magnus
>
>
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