Actually, I got to thinking, perhaps no one saw the funny side of it. Apologies if I caused offence, it's my daft sense of humour..
Talking about Chinese knockoffs, my mate bought an "eye-phone" in a market while in China... :) Yes, There are, unfortunately, it seems the one on eBay are not the real McCoy. Actually, Cisco had hell with this, Counterfeited NM cards etc, I believe it is still happening to this day. I fear we are straying off topic... Cheers Bob :) -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Bob Camp Sent: Thursday, 6 June 2013 8:46 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Z3815A pinout Hi What I'm pointing out is that there are indeed *real* HP made Z3815A's in boxes. Ones without the crud, corrosion, flying soldered leads, and the like. Bob On Jun 6, 2013, at 1:07 AM, Mark C. Stephens <[email protected]> wrote: > 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: [email protected] [mailto:[email protected]] > 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 <[email protected]> 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: [email protected] [mailto:[email protected]] >> On Behalf Of Magnus Danielson >> Sent: Thursday, 6 June 2013 7:23 AM >> To: [email protected] >> 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 -- [email protected] To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
