On 04/02/12 04:19, John Miles wrote:
Someone earlier today made the point that for all the talk about the FEI
rubes, there hasn't been any real performance info posted. That prodded
me to start an experiment I've been meaning to do for a while. I have
samples of all three of the common telco Rb standards -- Efratom FRS,
Datum LPRO, and Fe8-5680.
Over the next couple of days I'll do measurement runs of each of the three
versus an HP-5065A laboratory Rb (for ADEV), and a Wenzel ULN (for phase
noise). I'll collect long enough to get solid ADEV out to at least 1000
second
tau on each unit. I have the FRS test running now.
If all goes well, I'll post the results early next week.
I'm doing some short-term runs on the ones I have around here, as well
(FE-5680A, PRS-10, LPRO). Will be interesting to see how close ours are.
So far, the FE-5680A is doing well in the ADEV department, but its AD9832
DDS chip adds some substantial noise and spurs to the 10 MHz output. Does
yours have that chip? I understand that some of them didn't.
Consider that we have two basic generation of 5680A, one using the
50,255.. MHz VCXO and one using 60 MHz + DDS VCXO. The later can then
have a DDS output option.
So there can be three different 10 MHz qualities. It would be
interesting to see the ADEV, TDEV and phase noise of all three.
Cheers,
Magnus
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