[time-nuts] HP Z3817A Reverse Engineering

Gerald Chafee gchafee at gmail.com
Fri Nov 8 11:50:09 EST 2013


Money has been sent - Paypal


On Fri, Nov 8, 2013 at 11:00 AM, Mart Sakalov <mart.sakalov at ericsson.com>wrote:

> Hello.
>
> Yes please. PAYPAL only.
>
> Best regards
> Mart
>
> ________________________________________
> From: time-nuts-bounces at febo.com [time-nuts-bounces at febo.com] on behalf
> of Gerald Chafee [gchafee at gmail.com]
> Sent: Friday, 08 November 2013 4:16 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] HP Z3817A Reverse Engineering
>
> Are you looking for a Paypal payment for postage?
>
> Gerald Chafee
>
>
> On Fri, Nov 8, 2013 at 10:07 AM, <ashley40 at aol.com> wrote:
>
> >
> > Hi All,
> >       We acquired a T-Bolt from an estate , its untested, seal is
> > unbroken, it might be good or might be Drek, but in either event its free
> > to someone for postage from 97113 to the lower 48.
> >    It will fit into a USPS Small Rate Box for $6.
> > We could ship it international, but at this point we don't know the cost.
> >
> > Thank You
> >
> >
> >
> >
> > Thank You
> > Kiss-Electronics
> > Ms Ashley Hall
> > 183 N 5th Avenue
> > Cornelius, Oregon
> > 97113
> >
> >
> > W7DUZ
> >
> >
> > www.kiss-electronics.com
> >
> >
> >
> > -----Original Message-----
> > From: Ed Palmer <ed_palmer at sasktel.net>
> > To: Discussion of precise time and frequency measurement <
> > time-nuts at febo.com>
> > Sent: Sun, Oct 27, 2013 1:54 pm
> > Subject: Re: [time-nuts] HP Z3817A Reverse Engineering
> >
> >
> > Hi David,
> >
> > Skip Withrow and I were able to figure out the connections and the basic
> > operational features.  I've attached a document that describes our
> > findings.
> >
> > I wouldn't mind picking up another E1938 oscillator, but I'm reluctant
> > to buy one that might have mismatched oscillator and circuit board (i.e.
> > the serial numbers don't match).  I've asked a couple of vendors if the
> > serial numbers matched, but they won't respond.  Does anyone have any
> > experience with a mismatched combination?  How's their performance?
> >
> > Ed
> >
> > On 10/27/2013 1:26 PM, David Hooke wrote:
> > >
> > > Hi Ed,
> > >
> > > My E1938 also came from a very battered STLN4096A from the same
> > > source, and I might also try to get the other boards functional. Could
> > > you share the details of the GPS connections, and which GPS receiver
> > > you used?
> > >
> > > Cheers,
> > >
> > > david
> > >
> > >> I recently purchased a Motorola STLN4096A with the HP E1938A
> > >> oscillator.  I bought it for the oscillator only.
> > >>
> > >> Then I got intrigued by the HP Z3817A GPSDO that's included. I've
> > >> reverse engineered most of it and I've got it running.  The 1 PPS is
> > >> really good ( 1000 measurements, Std. Dev. of <200 ps, min to max
> > >> range of <1.5 ns) and the HUP is very slowly dropping (currently at
> > >> 13 us after ~1.5 days) as the oscillator works out the kinks after
> > >> it's long sleep.  It's dropping much slower than my Z3801A did when I
> > >> first turned it on.
> > >>
> > >> There's one input that I haven't been able to figure out.  I've got
> > >> data in and 1 PPS in from the GPS receiver.  Everything seems to be
> > >> working so I'm at a loss what that the other input could be for.
> > >> There are no clues to it's function because it appears to go into one
> > >> of the Xilinx chips.
> > >>
> > >> Does anyone have any more info on the unit?  Has anyone figured out
> > >> the other input?
> > >>
> > >> I have searched the net and the archives.  There's very little info
> > >> or discussion on this unit.
> > >>
> > >> Ed
> > >>
> > >>
> > >
> > >
> > > _______________________________________________
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> > >
> > >
> >
> >
> >
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