Hmm, Something is awry with this particular Z3815A: e.g. p4th D > efc_rep 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00 0.000000 0.0 0 0.000000e+00 0.000000e+00 0.000000e+00
If I could figure out how to populate it... efc_comp looks like a likely candidate but, to quote TVB, "I got a little nervous about playing pforth roulette" ... -marki -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Azelio Boriani Sent: Thursday, 30 May 2013 12:00 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Z3815A Here the figures are the same, except: start ptr is 24 and stop ptr is 23 and last efc average is 680694.8 and not 0.0 On Wed, May 29, 2013 at 3:53 PM, Azelio Boriani <azelio.bori...@screen.it> wrote: > I haven't tracked the Z3815A startup so can't tell when the > uncertainty was available. Looking at the log (diag:log:read:all?) I > can tell that after the power on you should have a GPS reference valid > (~12 minutes later) then a GPS lock started and an ACT from unlock (~1 > second later). Two hours later you should have a position hold mode > started and I think that the uncertainty must be available at that > point. It will look high but should be available. > > On Wed, May 29, 2013 at 3:33 PM, Mark C. Stephens <ma...@non-stop.com.au> > wrote: >> Thanks Azelio, That's what I wanted to hear, it does display predicted >> holdover uncertainty. >> It still hasn't come up on mine and it's been of for more than 48 >> hours (uh-oh, everyone says) Without resetting it, can you, from memory, >> remember when the PHU was displayed? >> Like right after GPS lock (as per other smart clocks) or some time later? >> >> >> -marki >> >> >> -----Original Message----- >> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] >> On Behalf Of Azelio Boriani >> Sent: Wednesday, 29 May 2013 11:09 PM >> To: Discussion of precise time and frequency measurement >> Subject: Re: [time-nuts] Z3815A >> >> The Z3815A here has (right now) 3.4us/24h of holdover uncertainty and -7.0ns >> PPS relative to GPS. The health monitor and the self test show OK >> everywhere. It is ON since 12, 2011. >> >> On Wed, May 29, 2013 at 1:03 PM, Bob Camp <li...@rtty.us> wrote: >>> Hi >>> >>> Well, probably as good as the manual ... we have the guy who designed it >>> (Rick Karlquist) lurking around here somewhere. I don't think I've ever >>> seen a manual. >>> >>> How long have you had the 3815? If not so long, I'd contact the seller. You >>> have indeed convinced me to quickly fire up the next one I have coming in. >>> >>> Bob >>> >>> >>> On May 29, 2013, at 2:14 AM, Mark C. Stephens <ma...@non-stop.com.au> wrote: >>> >>>> Wow the 2 black heatsinks on the puck are really hot - too hot to touch. >>>> I don't think that would be normal deign. >>>> They are probably the excessive current sink culprits. >>>> Anyone got a manual for the e1398a OCXO? >>>> >>>> >>>> -marki >>>> >>>> -----Original Message----- >>>> From: time-nuts-boun...@febo.com >>>> [mailto:time-nuts-boun...@febo.com] >>>> On Behalf Of Mark C. Stephens >>>> Sent: Wednesday, 29 May 2013 12:36 PM >>>> To: Discussion of precise time and frequency measurement >>>> Subject: Re: [time-nuts] Z3815A >>>> >>>> I believe these were all rescued from the Tip (Dump, Trash) judging by the >>>> water damage and bent cases. >>>> >>>> Mine had been tested in Japan and had approximate co-ordinates in it: >>>> https://www.google.com/search?q=34+44'+N+135+21'+E&oq=34+44'+N+135+ >>>> 21 >>>> '+E >>>> >>>> Initially I had a OCXO communication error which I fixed by a >>>> :syst:pres (shrug, I thought it was pretty major at the time, I can >>>> tell you!) >>>> >>>> At the moment it's in an air scrubbed and temperature controlled room, >>>> naked, without its case. >>>> Both heatsinks are just slightly warm to the touch. >>>> However the Puck is fairly warm.. >>>> >>>> I still have "Holdover Uncertainty Predict: --" which is a bit of a worry. >>>> >>>> Also the 1PPS TI is always about -100ns relative to GPS, which is way out >>>> there.. >>>> >>>> >>>> -marki >>>> >>>> >>>> >>>> >>>> -----Original Message----- >>>> From: time-nuts-boun...@febo.com >>>> [mailto:time-nuts-boun...@febo.com] >>>> On Behalf Of Stewart Cobb >>>> Sent: Wednesday, 29 May 2013 8:13 AM >>>> To: time-nuts@febo.com >>>> Subject: Re: [time-nuts] Z3815A >>>> >>>> Your Z3815A may need more cooling than it's getting, especially if >>>> you have it resting "horizontally" as it looks like it should. I >>>> bought one of those "kits from China" about a year and a half ago. >>>> Powered it up, waited for it to lock ... and it was dead within a >>>> week, with the unmistakable smell of overheated electronics. One >>>> of the Vicor power bricks inside >>>> (probably) overheated and shorted out. Here's what I learned: >>>> >>>> The Z3815A board was designed to go into a VXI-like mainframe, with a >>>> carefully specified amount of cooling airflow. I think that particular >>>> board was designed to require that airflow, and overheats without it. >>>> There's a group in Australia which has experience with these boxes, and I >>>> got the impression from my contacts with them that they see the Vicor >>>> bricks fail pretty regularly. That would imply that they're not getting >>>> the cooling they need, because Vicor bricks in other applications are >>>> pretty reliable in my experience. >>>> >>>> You can see a photo of the original Z3815A on TVB's website here: >>>> >>>> <http://www.leapsecond.com/museum/z3815a/> >>>> >>>> The Z3815A I got from China was in a different case, just two bent pieces >>>> of sheet aluminum. The case _looks_ official, with the right label on the >>>> front and silkscreen on the back. But the board inside had a lot more >>>> crud and corrosion than the nice clean case did, and parts of the plastic >>>> edge connector on the back of the board were broken. Worst of all, the >>>> coaxial cable from the antenna connector ended in a one-inch flying lead >>>> soldered to the board. The "shield" of the coax cable ended in another >>>> flying lead, soldered to ground somewhere else. (Any RF engineers reading >>>> this are probably cringing now.) I'm pretty sure that no one at HP >>>> designed or approved that connection. Once I saw it, I understood why the >>>> GPS receiver appeared to be "deaf." Even connected to a very good >>>> antenna, it never saw more than 4 satellites, and even those had weak >>>> signals. >>>> >>>> Did someone in China find a cache of bare Z3815 boards in a scrapyard >>>> somewhere, and fab an official-looking case to match? I don't know, but >>>> it might be the way to bet. Meanwhile, take the lid off your Z3815A and >>>> feel the heatsinks on the power bricks. If they're too hot to touch, >>>> they're too hot; give them some air. >>>> >>>> Cheers! >>>> --Stu >>>> _______________________________________________ >>>> time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> and follow the instructions there. >>>> >>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> and follow the instructions there. >>>> >>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> and follow the instructions there. >>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
