[time-nuts] HP Z3817A Reverse Engineering

Mart Sakalov mart.sakalov at ericsson.com
Fri Nov 8 16:00:44 UTC 2013


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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>
>
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