Hi I’ve watched the two boxes fire up. They spend a bit of time blinking lights on this one and then on that one. From watching the “dance”, I think that the transistor delay circuit (or something like it) is indeed needed. There are multiple ways the delay and sequencing could be implemented. A cheap 5V PIC is certainly one way to do it. With no voltage coming out on the connector doing a purely external solution probably is going to require external power. I think I’d at least bring that out on one of the many unused alarm pins.
Bob > On Nov 1, 2014, at 9:52 PM, GandalfG8--- via time-nuts <[email protected]> > wrote: > > Hi Bob, > > I understand the consequences of not modifying the unit but, having done so > and having a REF-1 unit running stand alone, I was just commenting that I > wasn't sure whether or not it was necessary to implement all of Arthur's > modification in order to enable the basic functionality, or whether some > part of it might be purely to control the indicators. > > As a follow on from that I was wondering whether or not it might be > possible to achieve a similar result, at least to the point of just making it > > functional, just by cross linking some of the out and return paths, "faking" > it without the need for an additional powered interface if you like, not for > any other reason than it might then be possible to make a plug in > modification that could be fitted without needing to open the box. > > Regards > > Nigel > GM8PZR > > > > > In a message dated 02/11/2014 00:19:57 GMT Standard Time, [email protected] > writes: > > Hi > > If you: > > 1) Do not have two units (Ref 0 and Ref 1) > > — and — > > 2) Do not “fake out” the slave detect (= use the mod) > > Then the unit you have will not: > > 1) Enable the pps out > > 2) Enable the 15 MHz out > > It will try to disciple the OCXO, but you won’t be able to see any result > of that. > > Bob > > >> On Nov 1, 2014, at 7:05 PM, GandalfG8--- via time-nuts > <[email protected]> wrote: >> >> Hi Anthony, >> >> It's a new circuit that has to be inserted, which is what I've done, but > >> I'm not sure whether or not it's strictly necessary for the unit to > function >> or whether it's just there to get the lights sequencing properly and >> perhaps all that's needed for basic functionality are just the links. >> >> I'm leaving well alone for now to let the oscillator run overnight but >> will try it again tomorrow with just the links and see what happens. >> I'm also hoping to get some idea of the between unit signalling, > although >> I only have Z3811s I'm hoping, with the boards being an almost > identical >> match, that what goes one way should be matched by what comes the other. >> >> Regards >> >> Nigel >> GM8PZR >> >> >> >> In a message dated 01/11/2014 22:41:09 GMT Standard Time, > [email protected] >> writes: >> >> I wasn't clear from the photo whether the circuit was a representation > of >> what is on the board, and you just had to connect the pins listed > together, >> or whether this was a new circuit that had to be inserted. Sounds like >> the latter? >> >> Anthony >> >> -----Original Message----- >> From: time-nuts [mailto:[email protected]] On Behalf Of >> GandalfG8--- via time-nuts >> Sent: Saturday, November 01, 2014 4:04 PM >> To: [email protected] >> Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, > Z3810A, >> Z3811A, Z3812... >> >> Well, I'm happy to report that Arthur's modification does do the trick, >> although I don't know why as I don't have any data for the interface > as yet. >> I daren't disturb the 15 pin connector right now as this Z3811A PCB is > >> still out of its case and connected to a breadboard with wires just > pushed >> into the sockets, and for the same reason I don't have any computer >> connection at the moment either. >> >> My implementation isn't quite as described, in that I've not made a >> connection to the fault LED but am just manually pulling that input > high and low >> on the breadboard with another wire link as required. >> Whether or not this is part or all of the reason that my green "on" > light >> is flashing rather than steady I don't know, but I am seeing the 1PPS > and >> 15MHz outputs and the 15MHz looks to be conditioning ok. >> >> Aside from the 5 volt supply, which I'm picking off from pin 5 of the >> header between u33 and U34, and the aforementioned fault LED > connection, all >> the other connections can be made to J5 externally and could be housed > in a >> 15 way shell along with the switching circuits. >> >> I'm still hopeful that some cross linking of the right pairs might >> achieve the same result without the extra circuitry, so "all" that > needs to be >> done now is just to identify the right pairs:-) >> >> At least with it up and running it should be easier to check out some > of >> the inter-unit signalling. >> >> Thanks Arthur, your efforts are much appreciated. >> >> regards >> >> Nigel >> GM8PZR >> >> >> >> >> >> >> >> In a message dated 01/11/2014 15:25:02 GMT Standard Time, > [email protected] >> writes: >> >> For those who missed it, Arthur's post is at >> https://www.febo.com/pipermail/time-nuts/2010-June/047825.html and the > photo is at >> > http://i906.photobucket.com/albums/ac262/rjb1998/RFTG-uREF1photo1_zps87c505ca.jpg >> >> Anthony >> >> >> >> >> -----Original Message----- >> From: time-nuts [mailto:[email protected]] On Behalf Of > Arthur >> Dent >> Sent: Friday, October 31, 2014 9:20 PM >> To: [email protected] >> Subject: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, >> Z3811A, Z3812A GPSDO system >> >> Bob Stewart bob at evoria.net >> ?? ? I have both of my units sitting on the bench. I found that I > needed >> to connect them together to get the REF1 unit to come out of standby ? > . ?? >> >> Bob Camp kb8tq at n1k.org >> ??I suspect that somebody will have to figure out what the 15 pin >> connector / jumper is doing. On previous RFTG units there was a way to > re-wire >> the crossover interface to fake out the slave detect process. That > would let >> you run a single GPS equipped box and have it behave correctly. > Without >> the fake wires trick none of them played nice without the slave being >> present ? >> . ?? >> ++++++++++++++++++++++++++++++++++++++ >> Reposting what I had posted over a week ago, in case you missed it ? . >> >> Arthur Dent golgarfrincham at gmail.com Wed Oct 22 13:59:48 EDT 2014 > ?? >> ? >> Way back on Fri Jun 11 16:48:43 UTC 2010 I posted about using one of >> these units I had modified but at the time there wasn't a single person > who >> was interested. I have been using the RFTG-u REF1 since then and it is > a >> nice unit. The modifications I added (including a power supply -see > photo) >> allows the lights to cycle through their normal sequence on warm-up > and the >> second unit isn't needed at all ? . ?? >> >> -Arthur >> _______________________________________________ >> 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.
