[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812...
kb8tq at n1k.org
Sun Nov 2 21:11:32 EST 2014
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.
> 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.
> In a message dated 02/11/2014 23:03:34 GMT Standard Time, kb8tq at n1k.org
> 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.
> 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.
>> 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
>> insists on flashing the ON light rather than bringing it on solid. In
>> 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
>> wires into the connector it might be convenient to use both grounds.
>> In a message dated 02/11/2014 17:58:12 GMT Standard Time,
> goetz at g-romahn.de
>> 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
>>> 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
>>> starts in the top right hand corner and every row is numbered right to
>>> That's certainly how mine are numbered anyway, and I wired them
>>> accordingly, and it worked, so where the heck does that leave us
>> thanks Nigel for detecting this glitch. I removed all jumpers now and
>> tested some reasonable new/old combinations resulting in very simple
>> 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.
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