[time-nuts] Lucent KS-24361 / Z3810A : problem with Z3812A/REF 0 unit power up?
kb8tq at n1k.org
Sun Jan 4 19:20:56 EST 2015
More or less in order of probability :
1) The most likely case is the interconnect cable. A couple of plug / unplug cycles on both ends is well worth the trouble. Also a bit of flexing of the cable may be in order. No it’s not good that the cable is bit flaky, it’s an easy part to replace if it dies later. It’s also a part that goes away once you (if you) rewire the units.
2) Next up is a check of the GPS antenna. If the “No GPS” LED flashes, that’s an antenna fault.
Best bet - your REF-0 does have a problem.
For entertainment value, you can hook up an RS-422 serial to the Diag port and see what (if anything) the log has to say about the issue.
> On Jan 4, 2015, at 5:42 PM, Stan <swperk at earthlink.net> wrote:
> 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. 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
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