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

Bob Camp kb8tq at n1k.org
Sun Nov 2 18:08:30 EST 2014 

Hi

It looks like (for what ever reason) both of the pins we have called grounds are short pins. The other short pin is a CMOS input that we use to fake the slave present mode.

Bob

> On Nov 2, 2014, at 5:36 PM, Tom Miller <tmiller11147 at verizon.net> wrote:
> 
> Another mystery - what is on the three short pins?  Usually that is done for hot-plugging things and connects the ground first before the power is applied. In this case, maybe it is some critical data lines that do not want dirty signals? I will play some more later tonight.
> 
> Regards,
> Tom
> 
> ----- Original Message ----- From: "Bob Camp" <kb8tq at n1k.org>
> To: <GandalfG8 at aol.com>; "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
> Sent: Sunday, November 02, 2014 3:49 PM
> Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A,Z3811A, Z3812...
> 
> 
>> 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
>>>>> 
>>>>> _______________________________________________
>>>>> time-nuts mailing  list  -- time-nuts at febo.com
>>>>> To unsubscribe, go to
>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>>>> and follow the  instructions there.
>>>> 
>>>> _______________________________________________
>>>> time-nuts mailing list  -- time-nuts at febo.com
>>>> To unsubscribe, go to
>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>>> and follow the  instructions there.
>>> 
>>> _______________________________________________
>>> time-nuts mailing list -- time-nuts at febo.com
>>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>> and follow the instructions there.
>> 
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there. 
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.

More information about the time-nuts mailing list