[time-nuts] Datachron, Inc.

Robert Darlington rdarlington at gmail.com
Thu Jun 25 21:50:48 EDT 2009


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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