Bob, I am shocked! Are you Trolling?! To Quote Stuart Cobb, posted to this very list on 29th May, 2013: >>>> 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.
-----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp Sent: Thursday, 6 June 2013 12:10 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Z3815A pinout Hi Well if the Z3815 boxes are all fakes, they did a *really* good job on making up all the HP logo's and HP stickers. They even faked the right date codes for the add on stickers. They also did a very nice job with the custom cables that plug directly into everything. Bob On Jun 5, 2013, at 6:15 PM, Mark C. Stephens <ma...@non-stop.com.au> wrote: > Magnus, Just plug 18-60V into P10 (next to the GPS), Supposedly the input > power is steered by diodes so it is polarity insensitive. > Anyway, It's a standard connector, I am sure you have tons of them, On mine, > Pin 1 is wired to negative, Pin 2 to positive. > Pin2 is closest to the left edge looking from the front. > > Gently cut the white multi coax plastic connector shell off at the back and > the coax connectors just pull out. > Can do a seamless job with very little patience. > > You can fit certain SMB connectors as replacement. > Failing that, solder your GPS antenna feed centre conductor into b2, shield > can go in a1,a3,c1,c3. > > As a sidenote, I have seen inside those nice Z3815A boxes. > They are fakes. I know for fact they make the box in china and put an > old module in it :) If you have one of these fake ones, your Antenna Coax > will have about an inch of unexposed coax and the ground tacked in the wrong > place resulting in your GPS being as deaf as a post. > > There are also 2 SMB on the Z3815A board itself of note supplying 1PPS and > 10Mhz un-buffered. > > Back to the rear where you have removed the connector, 3 buffered 10Mhz > outputs are on d5,d8,d11 grounds are c4-12 and e4-12. > > The Z3815A are a really lovely unit, Mine got down to 200ns hold pred. > uncertainty within a couple of days. > Unfortunately I knocked the bench power out last night accidently while > trying to reach some coax snagged around something at the back. > > Apparently, Don't touch the current batch on Ebay, they were tested by some > chap in Japan and he sold the rejects to Chinese eBay sellers. > About 50% power on, but have poor performance. > This is hearsay of course, YMMV.. > > > -marki > > > -----Original Message----- > From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] > On Behalf Of Magnus Danielson > Sent: Thursday, 6 June 2013 7:23 AM > To: time-nuts@febo.com > Subject: Re: [time-nuts] Z3815A pinout > > On 06/05/2013 11:16 PM, Bob Camp wrote: >> Hi >> >> There are two very different 3815's out there. One comes in a nice >> box with rational connectors on it. (They are expensive). The other >> one is the plug in card that always seems to need a good scrub down. >> It appears to have the same "stuff" but connecting to it is not easy. >> These are about 1/2 to 1/3 the price of the other ones... > > Yes, the boxed up one just has a box around the same board. > > There are variants with E1938A and those with another oscillator. > > Mine is a plug-in module, and as I was considering if I could hook it into a > VXI chassi, I realized that I was lacking that PDF. A propper manual would > also be great. > > Cheers, > Magnus > _______________________________________________ > 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.
