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

Bob Camp kb8tq at n1k.org
Sun Nov 2 16:04:11 EST 2014


Hi

Good point. They could have GPS data simply to make the diag stuff happy, but not use it for the disciplining side of things. I had not considered that possibility. 

Others have reported SatStat working on the slave, so there is at least *some* data coming out that port.

Bob


> On Nov 2, 2014, at 3:58 PM, GandalfG8--- via time-nuts <time-nuts at febo.com> wrote:
> 
> Just another thought though, does the diagnostic port on the slave also  
> communicate with SatStat etc?
> 
> That would imply at least a transfer of serial data in one  direction, even 
> if not for the control functions.
> 
> Regards
> 
> Nigel
> GM8PZR
> 
> 
> In a message dated 02/11/2014 20:49:49 GMT Standard Time, kb8tq at n1k.org  
> writes:
> 
> Hi
> 
> The supplied cable is indeed very short. It’s also quite  stiff and a bit 
> flakey (intermittent). I would bet at least one cold order of  fries that 
> there is no bi-directional serial between the two units. If there  was, I doubt 
> our little pin shorting exercises would get things running.  
> 
> If there is no serial at all (no GPS data), that makes using the slave  for 
> a variety of projects quite simple (and thus attractive). One back burner  
> TimeNut project is an ensemble clock. 
> 
> If they are not looking at GPS  strings, they are not doing sawtooth 
> correction. That is an interesting  observation (if true). These boxes have roots 
> in the paranoid GPS SA era, so  that might not be a big surprise. 
> 
> Bob
> 
>> On Nov 2, 2014, at  3:32 PM, GandalfG8--- via time-nuts 
> <time-nuts at febo.com> wrote:
>> 
>> Given the expected close proximity of these units, presumably it  was  
> only 
>> ever intended that they should work as a pair, and I  remember Stu Cobb  
>> commenting on how short the supplied link  cable is, I wouldn't be too 
> surprised  
>> if there turns out to be  no serial comms between the units but perhaps 
> just 
>> handshaking via  asserted levels.
>> 
>> Regards
>> 
>> Nigel
>> GM8PZR
>> 
>> 
>> In a message dated 02/11/2014 20:12:35 GMT  Standard Time, kb8tq at n1k.org  
>> writes:
>> 
>> Hi
>> 
>> Yes, getting the GPS version worked out is certainly  the  thing most 
> people 
>> will be after. Doing the other box is a  bit further down the  road. The 
>> main thing (to me) is  documenting the 15 pin connector as best we  can. 
> That 
>> way  whatever somebody decides to do in the future, they have a good  
> starting  
>> point. Identifying which pins look like RS-422 and which look  like  CMOS 
>> would go a long way to figuring both sides of this  out. When I did the  
> other 
>> connectors, I just ran through them  with a DVM. 2.5V = 422 input, 1.5 or 
> 3.5 
>> = 422 output. I didn’t  have any CMOS. Everything else was either open  
>> circuit or  ground. 
>> 
>> Bob
>> 
>>> On Nov 2, 2014, at 3:01  PM,  GandalfG8--- via time-nuts 
>> <time-nuts at febo.com>  wrote:
>>> 
>>> Ah, I had wondered about that but was probably  being a bit selfish  as 
> I 
>> 
>>> only have the GPS based  units:-)
>>> 
>>> Given the  similarity, I would assume  where we've got to on these  
>> wouldn't 
>>> be a bad  starting point, and at least identifying the 1PPS input on the 
> 
>> 
>>> interface connector should be straightforward enough.
>>> 
>>> Regards
>>> 
>>> Nigel GM8PZR
>>> 
>>> 
>>> 
>>> In a message dated 02/11/2014 19:41:07  GMT Standard Time,  
> kb8tq at n1k.org  
>>> writes:
>>> 
>>> Hi
>>> 
>>> No,  once we get the GPS end  worked out, we need to do the  same thing 
>> for  
>>> the non-GPS end. If we can fake it into working with just a   PPS,  it’
> s 
>> the 
>>> perfect thing to use to attach an OCXO to a  newer GPS  (like the  
> Jackson 
>> Labs 
>>> part  …).
>>> 
>>> Bob
>>> 
>>>> On Nov 2, 2014,  at 2:15 PM,  GandalfG8--- via time-nuts  
>>> <time-nuts at febo.com> wrote:
>>>> 
>>>> Hi   Gotz
>>>> 
>>>> That's great stuff, thank you, I'll  try  that  later.
>>>> 
>>>> At this rate  we'll soon be finding  ways of doing this  without any   
>>> wiring 
>>>> whatsoever, perhaps we could start with  just  standing it upside down 
>> in  
>>> a   
>>>> dark corner on the night of the  full   moon:-)
>>>> 
>>>> Regards
>>>> 
>>>> Nigel
>>>> GM8PZR
>>>> 
>>>> 
>>>> In a message  dated 02/11/2014 17:58:12 GMT   Standard Time, 
>>> goetz at g-romahn.de  
>>>> writes:
>>>> 
>>>> 
>>>> 
>>>> Am  02.11.2014 15:08, :
>>>>> Ooh err, whoops, and oh  dear    !!
>>>>> 
>>>>> Arthur, I've  only just had a chance to  look at  your latest  photos, 
> 
>> and
>>>>> unless I've really  got my wires   crossed, if you'll pardon  the  
>>>> expression:-),
>>>>> your links on J5 are not shown on pins  2,  10,  12, and 15,  but on  
>>> pins  
>>>> 4,  6,
>>>>> 11, and  13.
>>>>> 
>>>>> As   far  as I'm  aware the numbering from the front of that connector 
>> as    
>>> 
>>>> shown
>>>>> starts in the top  right hand  corner and every  row is  numbered 
> right 
>> to
>>>>> left.
>>>>> That's certainly  how  mine are numbered   anyway, and I wired them
>>>>> accordingly,  and it worked, so  where the heck  does that  leave us 
>>> now?:-)
>>>>> 
>>>> --------------------------
>>>> thanks  Nigel for   detecting  this glitch. I removed all jumpers now 
> and 
>>>> tested  some   reasonable new/old combinations resulting in  very 
> simple  
>>>> scheme:
>>>> it seems  to  be sufficient to connect  pin2 and pin3 to  pin8  
> (ground).
>>>> Numbering as  provided  by Nigel and  markings on my  15  pin-plug.
>>>> 
>>>> Götz
>>>> 
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