[time-nuts] Low phase noise affordable GPSDO
ewaldo at healthetechs.com
Wed Jun 20 10:27:35 EDT 2018
Hello time afficionados. I've tried my best to scan through the archives to see if this has already been answered, so apologies if I missed something relevant. I am going to be experimenting with >10Ghz microwave frequency grounded coplanar waveguide phase combining/cancellation/detection across a number of generated signals. That being said, I am in the market for a GPSDO that has the least amount of phase noise. A secondary factor in my choice is how many 10Mhz references the GPSDO can provide to sync all my signal generators; not as concerned about what amplitude is provided.
Most of the cheap GPSDOs on eBay seem to have only 1-2 sine outputs with no understanding of expected phase noise. A solid option seems to be the TrueTime XL-AK but something tells me there might be options out there better than 1x10-12. Price is the right ballpark though I could justify spending a little more for better phase noise specs. I have no need to run without GPS lock so Rubidium source doesn't seems as necessary compared to something with a high quality (D)OXCO, but it would be nice to add that as an external source at a later time. Build vs. buy is an option, but I would like to avoid making costly mistakes so would favor buy if specs are comperable.
I would really appreciate advice from folks around here who already have some hard-earned experience on what my best options are. Whatever I get I'm likely to be stuck with for a while so I would rather take the time and research than to do a knee-jerk buy. Thank you ahead of time for any replies.
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