[time-nuts] Ashtech Z12 question.

[Mark Sims]

I just added support for the Z12 to Lady Heather and fired up my Z12 for the first time in a few years. It powers up in some kind of a weird loopback mode and you have to reset the receiver memory to get it working.

Does the Z12 have an internal memory backup battery? Mine is currently doing a long L1/L2 RINEX capture and I can't open it and check right now.
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[Bob kb8tq]

Hi

What you describe sure sounds like a ram battery died sort of thing. I’ve never noticed one in the boards I’ve
torn apart. I’d also admit that was a few years back ….

Bob

Post by Mark Sims
I just added support for the Z12 to Lady Heather and fired up my Z12 for the first time in a few years. It powers up in some kind of a weird loopback mode and you have to reset the receiver memory to get it working.
Does the Z12 have an internal memory backup battery? Mine is currently doing a long L1/L2 RINEX capture and I can't open it and check right now.
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[Peter Monta]

Post by Mark Sims
Does the Z12 have an internal memory backup battery?

Yes, there are two lithium thionyl chloride cells, Tadiran TL-5104. They
are 3.6 V primary cells, cylinders roughly AA in size, with spot-welded
axial leads. That part is obsolete, but Digikey has an equivalent,
TL-5903/P, which worked fine for me. They're easy enough to replace, but
the inside of the box is a little awkward, with multiple board levels,
screws, and hinges. Clip the spent cells free of their leads to make the
desoldering a little easier and to reduce the risk of heating the cells
(the chemistry is hazardous). There is also some foam double-sided tape
helping to hold the cells in place; will need to replace that as well.

The two cells are wired in a diode-OR, so a single cell will also work (for
half as long). While I was waiting for the shipment, I used a single
lithium coin cell, 3.0 V, to tide the box over, which also worked fine.

Cheers,
Peter
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