Forums › BB Series Discussions › How about the phase stability of two BB60Cs if an external freq. ref. were used?
- This topic has 1 reply, 2 voices, and was last updated 7 years, 7 months ago by Justin Crooks.
guoanParticipantguoan August 4, 2015 at 6:39 pm
I have several BB60Cs. I would like to know the relative phase stability performance while they are set using the same parameters(center freq.,gain,level,etc.), and share a high quality 10Mhz OCXO as external frequency reference? For example what’s the rough phase drifts(in degree) within 30 minutes at CenterFrequency=200Mhz?
Justin CrooksModeratorJustin Crooks August 5, 2015 at 9:37 am
With a shared external frequency reference, in streaming mode only, there should be zero phase drift. However, every time you change center frequency, there will be a new phase offset.
If there is phase drift from floating point frequency correction rounding errors at some frequencies, I would think it would be very small and identical across devices and therefore cancel, but I have not tested this (maybe 1 degree per minute?).
At even multiples of 20 MHz (e.g. 200.00 MHz), this correction should be zero, so you should get a true zero phase drift. If you test this, let me know. If there is phase drift, there should be a way to easily get rid of it, possibly by using streaming IF instead of I/Q…
You must be logged in to reply to this topic.