[time-nuts] Lucent KS-24361 / Z3810A : problem with Z3812A/REF 0 unit power up?

Bob Camp kb8tq at n1k.org
Mon Jan 5 07:08:54 EST 2015

> On Jan 4, 2015, at 6:51 PM, Gerhard Hoffmann <dk4xp at arcor.de> wrote:
> Am 04.01.2015 um 23:42 schrieb Stan:
>> I just received my Lucent KS-24361 and set it up on my bench to power it up.
>> I connected the Z3809A interconnect cable between the two units (Z3811A/REF
>> 1, and Z3812A/REF 0) and applied +24VDC to the appropriate pins on the two
>> DE-9 connectors. The Z3811A/REF 1 ran through a sequential test of the four
>> LEDS and then after a few seconds it settled in with the amber "NO GPS" and
>> the red "FAULT" LEDs illuminated. Meanwhile, the Z3812A/REF 0 unit never lit
>> a single LED and is still sitting there with all LEDs dark.

The LED’s on *both* units should go through a “dance” at power on. The cycle of LED’s lighting up during boot is similar on both units. The process on the slave unit (REF0) appears to be controlled by the REF1 unit. Since the signaling between the two is very simple, a lost connection on the cable could cause this sort of thing. 

LED’s out *after* boot is normal until the GPS locks up to location on the REF1 and then starts sending data to the REF0. 


>> Both units are
>> drawing current: the Z3811A/REF 1 draws about 700 mA steady state, and the
>> Z3812A/REF 0 draws only slightly less: 600 mA steady state. So far, I've
>> swapped power connectors between the units and saw no difference, and I
>> tried to power up the Z3812A/REF0 alone, but still no joy.
>> Am I missing something about the setup, or do I have a defective Z3812/REF 0
>> unit?
> That's normal. The pair goes "ON" only when it sees GPS for quite some time.
> BTW the POWER consumption is fixed. If you have more voltage, the current will drop.
> regards, Gerhard
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