> It ought to be a bit better than this, but the 10uS PPS width is a bit too > short for a steady timing of centroid through a soundcard at 192k samples/ > sec, I need to stretch the pulse a factor of 10 or so.
The PPS on my TBolt was also too short for a PC running Linux/ntpd to catch it. (It works on another system with different hardware.) Here is how I kludged it... >From the TBolt PPS pin: resistor (current limiter) diode cap to ground resistor across cap (decay) I think I used 50 ohms for the current limiting resistor and 0.1 uF for the cap. I forget the value of the other resistor. That's far from symmetric so finding the "centroid" may get interesting and/or may not work at all. I was connecting it to pin 1 (DCD) on the serial port. That's where ntpd expects PPS and it's unused on the TBolt. It all fits on the bottom side of the board inside the TBolt box. Or you could try the FatPPS from TAPR: http://www.tapr.org/kits_fatpps.html Or look at the manual in for ideas. It uses a 74HC123. -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ 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.
