On Mon, Oct 31, 2011 at 1:54 AM, David J Taylor < david-tay...@blueyonder.co.uk> wrote:
> Nuts, >> >> I recently picked up a C-Max evaluation kit from SparkFun to see if this >> $10 board could be used as a precision timing source. The short answer is >> no. The long answer is available at: >> http://www.fuzzythinking.com/?**page_id=29<http://www.fuzzythinking.com/?page_id=29>. >> >> It was a fun experiment and a great excuse to play with test equipment :-) >> >> Thanks, >> -JP >> > > Thanks for posting that, Justin, it was most interesting, and the > reference to Brooke Clarke's page, which I did not know. > > It would be interesting to know what the analogue signal looks like, as > many pieces of electrical and electronic equipment can radiate > significantly on those frequencies. I expect you optimised the signal, > though, as you've mentioned it. > > Are you sure the images are all correct? To me, your Fig 2 and Fig 3 > images look identical, as do Fig 6 and Fig 7. > > "Precision" - well, that depends, doesn't it? Perhaps more precise than a > very poor Internet connection? Better than no Internet connection at all! > Certainly not GPS level. > > Cheers, > David > Hi David, Thanks for pointing out the problem with the figures in my webpage. I have fixed it. I'm going to attempt to capture the analog signal by probing the QOut pin. Good point about "precision" - it's all relative. This is an extension of a previous project of mine - a clock I built around an LPro. Setting it to the Thunderbolt is a bit of a pain and I was hoping to build in the C-Max to make it more "fire and forget". I was hoping for a time signal within several microseconds of UTC without the need of an outdoor antenna. Like most of my projects, the journey is more interesting than the destination, so even if I don't accomplish that goal I'm still having fun. Embedding a consumer GPS is probably the more practical solution. Thanks, -Justin _______________________________________________ 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.