[time-nuts] Datachron, Inc.
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.
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...
> 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.
>> > 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
>> > have gone out of business, but I'm hopeful that somebody just bought
>> > changed their name, and has a hidden supply of manuals somewhere.
>> > Thanks,
>> > Bob, N3XKB
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