[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812...
kb8tq at n1k.org
Sun Nov 2 21:54:42 EST 2014
Here’s another way to look at the data:
pin pin res res
Pair from to from to
A 1 9 oc/1k 10k
B 2 10 10K o.c.
C 3 11 1K 1K (short pin on 3)
D 4 12 1K o.c.
E 5 13 o.c. gnd (short pin on 13)
F 6 14 1K o.c.
G 7 15 o.c. o.c./ 1K
I don’t know if that’s more clear or more confusing. It certainly suggests there are a variety of things going on.
OC on one, 1K on the other D,F and 1/2 G
Different GPS, Slave A,G
OC on one end 10K on the other B and 1/2 A
OC one end Ground on the other E
1K both ends C
OC both ends 1/2 G
1K and 10K 1/2 A
I suspect some of the open circuits are just that - no connect.
I wonder what happens if you plug two GPS’s together or two slaves together? Some of the odd pins may be to sort that kind of thing out.
> On Nov 2, 2014, at 9:11 PM, Bob Camp <kb8tq at n1k.org> wrote:
> 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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