On Thu, Jun 19, 2014 at 11:47 AM, Tom Van Baak <t...@leapsecond.com> wrote:
> Chris, > > I'm glad you're making progress on your Arduino GPSDO. You've mentioned it > in a dozen postings the past half year. Perhaps you will post the source > code sketch, full design, and actual phase / frequency / adev results some > day. Many of us are willing to help as independent testers and see actual > results. > I've posted the schematic and source code. I don't have any good way to measure performance except with the device itself. A GPSDO measures itself every second. Could I use that data? It would be easy to push it across the USB interface to a computer. My goal was to make something as simple and low as possible. I'd make it better except for I need some way to see if it really is better. > Meanwhile... Now would be the time for you to let Bert have the stage; he > has an actual working design, with PCB, and several tests in progress. > High-performance results. This represents a year of work on his part, and > others who have freely collaborated and contributed to all aspects of his > project. It's really nice. > > Please do not hijack the thread of another time nut's superb effort. Some > week it will be your turn to post final results of your project. This is > not the week. > > Thanks, > /tvb > > ----- Original Message ----- > From: "Chris Albertson" <albertson.ch...@gmail.com> > To: "Discussion of precise time and frequency measurement" < > time-nuts@febo.com> > Sent: Thursday, June 19, 2014 8:31 AM > Subject: Re: [time-nuts] FE5680 GPS Disciplined Controller > > > > I've been working in the same thing BUT I don't want anyone who builds it > > to need a PCB. And I want the firmware to load over USB so there is no > > need to ship programmed chips or deal with external programmers. I > think > > I can get the cost below $20. That said I doubt I'll get 1E-13 > > performance out of my Rb. > > > > My little Arduino based controller has been running now for a couple > months > > and keeping a crystal in lock. The board has a pins left over for a > serial > > port that I'll hook up to the Rb. > > > > The trick to getting the cost down is NOT to do a custom PCB. Take > > advantage of one of the uP development boards and then for under $5 you > get > > the USB interface, D/A and A/D, serial ports, timers and quite a bit of > > logic all 1/3rd the size of a credit card. > > > _______________________________________________ > 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. > -- Chris Albertson Redondo Beach, California _______________________________________________ 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.