[time-nuts] 1PPS users?

Bob Camp kb8tq at n1k.org
Sun Dec 18 19:16:34 EST 2016


Roughly 99% of all GPSDO’s are only used for the PPS output. They go into cell sites and the reason
they exist is to sync up the Gold Codes on CDMA. That’s also why you see a *lot* of PPS only Rb’s
on the surplus market. The ones that don’t get used for cell towers, mostly go into other com systems 
that for some reason need to have accurate time (also involves codes …).


> On Dec 18, 2016, at 6:16 PM, Bob Stewart <bob at evoria.net> wrote:
> One thing I've never really understood is who actually uses the high-quality 1PPS output from a GPSDO.  I have spent a lot of time, effort, and money on developing my GPSDO without a whole of thought to the user base.  It was just a quest for the best result I could obtain with a particular technology.  The frequency standard users was a no brainer.  Everyone who wants a frequency standard eventually understands they need to get a GPSDO, or an Rb, or a Cs.  And that's all I thought I had: a good frequency standard.  And then Tom prodded me a bit and showed me the shortcomings of what I was doing, and I did something about it.  So, if an NTP user can get his time fix directly from a noisy receiver, who actually needs a time-accurate, low jitter 1PPS pulse?
> Bob - AE6RV
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