[time-nuts] Datum/Exactime 9390-6000

[Azelio Boriani]

Is the GPS unit built-in (TBolt-like) or is it a separate module? Maybe
there is a firmware update for the GPS unit itself to fix the rollover
problem.

On Tue, Jun 12, 2012 at 5:26 AM, Ziggy <ziggy9 at pumpkinbrook.com> wrote:

> I've recently acquired one of these, primarily to use as an alternative to
> (and for comparison with) my Thunderbolt. This was a DC model that was
> inoperative when I received it and at $225 (price from the OEM) to replace
> the failed DC-DC converter, I installed an AC supply. So far, so good. The
> unit powers up, tracks, locks the OCXO and things look generally good. I'm
> giving it some burn in time before I try to characterize it. However, I
> have a couple of issues. I did search the archives, and have contacted
> Symmetricom (who politely told me this unit was obsoleted 2 generations of
> product ago :)
>
> The menus and serial command responses do not match any version of the
> manual that I can find, although the Datum 9390 manual on Didier's site is
> pretty close on the commands. Does anyone have a manual that covers this
> model/firmware?
>
> This unit suffers from a GPS epoch rollover problem. This makes the date
> produced incorrect, and there is no way to override it, or offset it in my
> firmware (DT813MP) other than running it in 'freewheel' or undisciplined
> mode. It's my understanding that there may have been a firmware update to
> address this, so if you have a firmware image, or a unit with later
> firmware it would really be great to get a PROM copy/image.
>
> And perhaps a silly question: Is the LCD supposed to be illuminated?
> Because mine isn't. I haven't taken the front panel apart yet to check out
> the display - I've been more concerned with getting the unit operational.
>
> In the end, it's pretty usable the way it is, but the date being off irks
> me. I'd like to fix that if I can, and docs that match the hard/firmware
> would be nice. Any help would be greatly appreciated.
>
> Best regards,
> Paul - K9MR
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