[time-nuts] z3801a, z3805a, z3815a, z3816a, thunderbolt and thunderbolt

Justin Pinnix justin at fuzzythinking.com
Wed Nov 30 13:30:43 EST 2011


There are some issues using a Thunderbolt with NTP.  See
http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver29.html (the stuff
about event polling).

Also, you will need http://www.tapr.org/kits_fatpps.html (or something like
it) if you want to use its PPS signal with NTP.

On Wed, Nov 30, 2011 at 4:08 AM, Mark C. Stephens <marks at non-stop.com.au>wrote:

> Hey Thanks for the reply, I have 2 uses for the GPSDO, ref clock for NTP
> server or 10mhz ref clocks for the labs.
>
> If I find one is not suitable for one task, I can try it on another.
>
> I have built a few GPSDO and regularly change oscillators, so I have a
> good idea about the circuitry and performance.
>
> Having said that it gets very hard to approach a professionally designed
> unit.
>
> Actually, I am toying with the idea of 3 separate Thunderbolts connected
> to NTPD using thunderbolt drivers. Each of the Trimble's will use a
> separate antenna (3 active antenna cost less than a splitter, go figure)
>
> But I am beginning to ask myself why?! Isn't it good enough already?
>
>
> mark
>
> Date: Tue, 29 Nov 2011 12:20:45 +0100
> From: Azelio Boriani <azelio.boriani at screen.it>
> To: Discussion of precise time and frequency measurement
>        <time-nuts at febo.com>
> Subject: Re: [time-nuts] z3801a, z3805a, z3815a, z3816a, thunderbolt
>        and thunderbolt II
> Message-ID:
>        <CAL8XPmNzspUXNiM-hBMzgP5-sFQadxroQ19_yZNKQgOJmc338Q at mail.gmail.com
> >
> Content-Type: text/plain; charset=ISO-8859-1
>
> A long-time data collection? I can test an HP58503A (I think it is the
> Z3801A), I have the Z3815A and the TBolt. Of course I need time to test...
>
> On Tue, Nov 29, 2011 at 10:37 AM, Hal Murray <hmurray at megapathdsl.net
> >wrote:
>
> >
> > marks at non-stop.com.au said:
> > > Hi All, Risking opening a potential can of worms, has anyone have a
> specs
> > > roundup of GPSDO?
> >
> > > Ideally, Maximums of Phase noise, Jitter, accuracy...
> >
> > One of the variables is the quality of the antenna, both position and
> loss
> > in
> > the cable.
> >
> >
> > --
> > These are my opinions, not necessarily my employer's.  I hate spam.
> >
> >
> >
> >
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>
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