As asked by another, please post a PDF of the schematic. I don't have any software installed that can read the files you posted.
Joe Gray W5JG On Sun, Jun 27, 2010 at 3:54 PM, Magnus Danielson <mag...@rubidium.dyndns.org> wrote: > On 06/26/2010 09:11 AM, Richard H McCorkle wrote: >> >> Fellow Time-Nuts, >> When I first uploaded the Simple PICTIC interpolating time interval >> counter to the K04BB site in 12/08 and presented it to the group as >> a Christmas present my goal was to get amateurs building their own >> interpolating time interval counters for GPS monitoring and making >> improvements to my design. The interpolator in the PICTIC was >> “borrowed” from an early HP counter with minor modifications so I >> didn’t design it and had no personal attachment to it. > > Which counter? Just curious. > >> Over the last 18 months I have developed a new diode switched >> interpolator based on the comments made on line and have thoroughly >> tested it. Some suggestions made improvements in the performance and >> some resulted in poorer performance. I incorporated those suggestions >> that made improvements, eliminated those that made things worse, and >> once I was satisfied I sent the revised interpolator design directly >> to Bruce off line. Based on comments and suggestions he returned >> during a long series of emails I incorporated additional changes in >> the code, front-end, and interpolator designs and tested those >> changes until I was satisfied with the performance and he had no >> further comments. I am finally satisfied with the new design and >> admit that by incorporating the majority of the suggestions made >> the new interpolator has significantly better linearity than the >> HP interpolator used in the PICTIC and it is now suitable for >> higher resolutions. >> I was reluctant to post the PICTIC II in this forum, as I don’t >> want to get in another public discussion of its faults without any >> discussion of the merits of a $50 serial output interpolating TIC >> on a 3.8” x 2.5” thru-hole board designed for amateur construction. >> The K04BB WIKI PICTIC page was recently updated to include the >> PICTIC II code and ExpressPCB board layout and schematic files for >> those that might be interested. >> >> http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:pictic >> >> The PICTIC II incorporates the new interpolator, requires a delay >> between the inputs, and uses a low stability XO timebase with >> software peak detection for calibration with provision for an >> external timebase like the PICTIC to minimize size and cost. > > Sounds interesting. What is the ball-park figures? Resolution, jitter, > linearity? > > Cheers, > Magnus > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.