[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812...

[Bob Camp]

Hi

It’s an added circuit you need to build up and add to the box. It fakes out the slave detection logic.

Bob

> On Nov 1, 2014, at 6:41 PM, Anthony Roby <aroby at antamy.com> wrote:
> 
> 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:time-nuts-bounces at febo.com] On Behalf Of GandalfG8--- via time-nuts
> Sent: Saturday, November 01, 2014 4:04 PM
> To: time-nuts at febo.com
> 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, aroby at antamy.com
> 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:time-nuts-bounces at febo.com] On Behalf  Of Arthur Dent
> Sent: Friday, October 31, 2014 9:20 PM
> To:  time-nuts at febo.com
> 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
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