I managed to get a TrueTime NTS-100 IRIG (yes it's old I know), and the first thing I did was pop open the chassis. ;) I was amazed how little space was actually used by the card and power supply, plenty of room to add other time stuff (maybe I can fit in a GPS and a Soekris board). I don't have anything that can output IRIG-B yet, but I just couldn't pass this up.
Anyhow, I contacted Symmetricom about a PDF manual, and they were nice enough to send me one (I also got the GPS version manual from someone else - if anyone wants either let me know). It only gives the basic commands and nothing about the various jumpers and headers on the board. I tried my best to squeeze out some tech info from the Symmetricom guy but no luck. Also a firmware upgrade he said would cost at least $250 and he didn't know if it was still available (not really worth it since I bought the unit for only $100). I started probing around with my oscilloscope and frequency counter and have made a few discoveries and have a few hunches. Does anyone else have a NTS-100 (either GPS or IRIG or PPS)? It would be especially helpful if you have some non-standard options. If you do, can you snap a few high-res pics of the board so I can see how you jumper layout compares? The 10 MHz output was the first thing I found, it was quite obvious as the connector was similar to the alarm. I think I have found the jumper to disconnect the onboard VCTCXO (and wire in an external OCXO or whatever), and the tuning voltage pin. Without having an IRIG signal going in it doesn't bother to try and steer the oscillator any so I can't fully test this out yet. I'll probably pull the board out tomorrow so I can follow the traces on the bottom side. Also I want to drill a hole and mount a BNC connector for the 10 MHz output. It may be old but it is an interesting little piece of technology, and it still works. The inside was extremely clean, no dust or anything, like it just came off the assembly line. _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
