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

Bob Camp kb8tq at n1k.org
Sun Nov 2 00:19:54 UTC 2014


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 <time-nuts at febo.com> 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, aroby at antamy.com  
> 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: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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