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

Sun Nov 2 15:58:20 EST 2014

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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