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 <[email protected]>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 > <[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.
