Hi,
I'm writing a "Getting Started" guide for our research group. When I
got to the GPSDO section, I had difficulty in figuring out the frequency
stability and the frequency accuracy of the B210.
At least the early versions of the B210 used a CTS Electronic Components
520L20DA40M0000 TCXO. The datasheet for this TCXO says it has a
frequency _stability_ of +/- 2.0 ppm over an operating temperature range
of -30C - +85C.
The CTS website states that their TCXO exhibit: "Stratum 3 Performance;
±4.6ppm overall, ±0.28ppm over -40°C to +85°C". Am I correct in
concluding that this is the frequency _accuracy_ of the TCXO used in
the B210? Does this translate directly into the frequency _accuracy_
of the B210?
The B210 datasheet states a frequency _accuracy_ of +/- 2.0 ppm. Is
is a typo, and should the datasheet actually say frequency _stability_?
Or, did someone conclude that over a reasonable operating temperature,
the effects of temperature outweigh any inaccuracy in the frequency
of the TCXO?
Anecdotally, I have heard that one organization found that three of
their four B210s, when operating as a 5G base station, were unable
to connect with commercial off-the-shelf cellular handsets, unless
an external GPSDO was used with the B210. Does anyone have any idea
what frequency accuracy is expected by cellular handsets?
So, does anyone know what the frequency _accuracy_ of the B210 is, in
the absence of a GPSDO? Or, should I just use the +/1 2.0 ppm figure?
Thanks,
-tjs
- - - -
[1]
https://www.ctscorp.com/Files/DataSheets/Passives/FCP/TCXO/TCXO-520-datasheet.pdf
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