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

Bob Camp kb8tq at n1k.org
Sun Nov 2 21:11:32 EST 2014


Hi

Well here’s some data to think about:

Pin 		GPS box				Slave box

1		o.c.					1.1 K
2		10 K					10 K
3		1.1 K				1.1 K
4		1.1 K				1.1 K
5		o.c.					o.c.
6		1.1 K				1.1 K
7		o.c.					o.c.
8		ground				ground
9		10 K					10K
10		o.c.					o.c.
11		1.1 K				1.1 K
12		o.c.					o.c.
13		gnd					gnd
14		o.c.					o.c.
15		o.c.					1.1 K

All of the above are resistance to ground on a unit with no power. Just for reference, the 422 transmitters on the PPS connector read 550 ohms, the receivers read around 3K ohms. 

Simply put, except for the resistors on pins 1 and 15, the two boxes look a lot alike. No idea if the open circuit (o.c.) is actually connected to something or not. 

Bob

> On Nov 2, 2014, at 6:25 PM, GandalfG8--- via time-nuts <time-nuts at febo.com> wrote:
> 
> It would seem that the hunt for 1PPS will need to be attempted by someone  
> with two units coupled together.
> I don't know if there's some sort of handshake enablement but with just the 
> Ref-1 unit I've not been able so far to find 1PPS on the Interface 
> connector,  either during the boot up sequence or when up and running.
> 
> The 1PPS on pin 6 of the RS422/1PPS connector is very easy to spot so I  
> don't think it's just a case of me missing it on the interface.
> 
> Regards
> 
> Nigel
> GM8PZR
> 
> 
> In a message dated 02/11/2014 23:03:34 GMT Standard Time, kb8tq at n1k.org  
> writes:
> 
> Hi
> 
> I bet (again the order of fries) that the ground on pin  13  that crosses 
> to is some sort of “other box plugged in” indicator.  
> 
> So:
> 
> The 15 pin cable is:
> 
> 
> Pair        End A        End B
> 
> A       1            9
> B       2            10
> C       3            11     (short pin  on 3)
> D        4           12
> E        5           13   (short pin on 13)
> F         6            14
> G         7            15
> 
> ground      8            8 (short pin on 8)
> 
> 
> Pair  B - CMOS signaling 
> Pair C - CMOS signaling
> Pari D - one half of  RS-422
> Pair E - CMOS signal ?  ground on pin 13
> 
> We have A, F,  and G in the “to be discovered” category. One of those 
> should be the other  half of D. Something in here should be a PPS.
> 
> Bob
> 
> 
>> On  Nov 2, 2014, at 5:48 PM, GandalfG8--- via time-nuts 
> <time-nuts at febo.com>  wrote:
>> 
>> Thanks Gotz
>> 
>> 2 and 3 grounded works  fine for me too, although I still have one unit 
> that 
>> insists on  flashing the ON light rather than bringing it on solid. In 
> all 
>> other  respects both units seem to match. Two more should be arriving  
>> sometime in  the next couple of weeks so will see how they match  up.
>> 
>> Just for reference, pin 13 is also a ground connection so  if just 
> pushing  
>> wires into the connector it might be convenient  to use both grounds.
>> 
>> 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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