Ulrich,
I think this is a bit like discussing one's favourite wine or favourite
stereo! Especially since many of the participants here will not have the
capability to compare GPSDO performance reliably.
I have a few GPSDOs, and it's my impression that of them all the Agilent
Z3815A with MTI260 DOCXO has the best phase noise. Of course these units
were originally equipped with an E1938A, and the later MTI260 version is not
as common.
I also have an E1938A, which I operate standalone. It is very impressive,
excellent AD, in fact my best source now that I've given away my HP 5065A.
There is some phase noise well away from the carrier, but I've put that down
to my own construction (switching power supply noise).
Another of my favourites with low phase noise is the Trimble/Nortel
NTGS50AA, which has a CMAC/Rakon CFPO-DO OCXO. I've had no opportunity to
measure the AD apart from what Lady Heather reports. This unit is physically
large but is not power hungry and talks to LH very well.
I also own a Z3801A, a Samsung GCRU-D and a small homebrew GPSDO with a
CFPO-DO. Sorry, no Timepod for comparisons.
73,
Murray ZL1BPU
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