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 <[email protected]>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 <[email protected]> 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 >> > _______________________________________________ >> > time-nuts mailing list -- [email protected] >> > To unsubscribe, go to >> > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> > and follow the instructions there. >> > >> > >> >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
