[time-nuts] 1PPS users?

Tim Shoppa tshoppa at gmail.com
Mon Dec 19 07:24:03 EST 2016

You know, there's a reason this list is called "time-nuts" and not
"frequency-nuts" :-).

But sometimes I wonder if "phase-nuts" might be a better term.

It is so incredibly useful to put your best 1 PPS into a scope and use that
to watch for systemic effects on your second-best clock. That's why we then
end up with a third, fourth, fifth, etc. clock :-)

So many newcomer GPSDO makers seem to just do frequency lock but rarely do
they or their users know the difference.

At same time there are so many non-ntpd NTP implementations that just jump
instead of slew the clock.

Tim N3QE

On Sun, 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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