[time-nuts] Datachron, Inc.

Robert Darlington rdarlington at gmail.com
Thu Jun 25 23:57:58 EDT 2009


There is a 44 pin chip that seems to have had a pin broken off.  In my
attempts to short this to an already mangled chip socket, I managed to let
some smoke out.  Oh well, now I have a pretty metal paperweight that I may
convert over to using NMEA signals from a gps.

Thanks guys,

-Bob

On Thu, Jun 25, 2009 at 7:50 PM, Robert Darlington <rdarlington at gmail.com>wrote:

> The only jumper I could see is on the display board.  It appears to just be
> a segment test.  I verified that it's running at 1kHz modulation against a
> frequency synthesizer on the scope.  Amplitudes look fine.  I tried
> everything from about 0.1 V peak to peak to about 5 volts peak to peak.
> I'll keep looking around for a manual.  I suspect Bruce might be right about
> it wanting TTL without the carrier.
>
> Thanks,
> Bob
>
>
> On Thu, Jun 25, 2009 at 7:24 PM, Robert Darlington <rdarlington at gmail.com>wrote:
>
>> I'm 99% sure.  What I see on the scope looks like what I see in the spec.
>> AM modulated signal, but I didn't actually verify the timings yet.  I
>> figured that even if I was off a bit, that *something* should change on the
>> display.  Maybe this is a poor assumption.  I'm off to find a jumper...
>>
>> -Bob
>>
>>
>> On Thu, Jun 25, 2009 at 7:21 PM, J. Forster <jfor at quik.com> wrote:
>>
>>> Are you sure you are really feeding it IRIG-B? You might try looking at
>>> your TC signal with a 'scope and seeing if it meets the IRIG spec.
>>>
>>> Such a test would bisect the problem.
>>>
>>> FWIW,
>>> -John
>>>
>>> ==========
>>>
>>> > Hi guys,
>>> >
>>> > What happened to Datachron?  I'm trying to dig up a manual for an
>>> IRIG-B
>>> > display, Datachron model 3700-205 that I just picked up on eBay:
>>> >
>>> > http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=290323873289
>>> >
>>> > It came in today and powers up, and looks just like it does in the
>>> > pictures.  Doesn't seem to do anything more than that, either!   I'm
>>> > trying
>>> > to drive it using NMEATime software.  It seems that no matter what
>>> > amplitude
>>> > I'm using, the display does nothing.  I reseated all IC chips, wiggled
>>> > connectors, the standard sort of thing.  No change.   Datachron appears
>>> to
>>> > have gone out of business, but I'm hopeful that somebody just bought
>>> them,
>>> > changed their name, and has a hidden supply of manuals somewhere.
>>> >
>>> > Thanks,
>>> > Bob, N3XKB
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>>> >
>>>
>>>
>>>
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>>
>



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