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

Sun Nov 2 22:36:54 UTC 2014

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
>>>>
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