Hi Matthias,
I seem to recall a similar issue and as I recall it, I could see
"wobbles" on the output, which I presume is from the rubidium lamp
RF-generation. It was quite obvious when looking at the output with a
scope. I am quite sure it was a LPFRS-01.
Cheers,
Magnus
On 05/23/2017 09:40 AM, Matthias Jelen wrote:
Hello Time-Nuts,
i´ve been playing with some Rbs recently.
I compared two LPFRS-01 to a PRS-10. One seems to behave quite well (compared
to the specs given here:
http://www.spectratime.com/uploads/documents/isource/iSource_LPFRS%20Spec.pdf)
- short term stability specs are met), the other one shows quite some phase
ripple (appx. 1 ns RMS with a frequency around 0.007 Hz) which spoils ADEV in
the 60 - 200s range, very similiar to the typical GPSDO bump. Long term
stabilty is OK.
Unfortunatly I didn´t find any schematics on the web. Has anyone encountered a
similiar problem with this unit? Any idea were this might come from? My first
guess would be a problem in the control loop locking the VCXO to the Rb, but I
have no clue which time constants are used in the PLL.
Any hints are appreciated.
Regards,
Matthias
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