Back from travel. I hijacked another thread and that is bad behavior. Sorry. So here is the thread all by itself.
Background To remove the new wwvb bpsk so that old phase tracking receivers can work. As a by-product of that effort you do obtain the new format data from wwvb. Already released are traditional analog and pseudo digital approaches along with a wwvb RF receiver and regenerators for classic time receivers like the Spectracom 8170 and Truetime DC60. Pretty much all of the approaches so far look for a phase change and invert that change if it departs from the reference. But I have always felt there should be more of a pure digital solution. To add to that the power that is available in the arm evaluation boards is truly amazing along with costs that are very cheap. They include physical boards (No soldering required) and amazing development tools for free. Those combinations are enough to motivate at least me to learn. To date I have experimented a bit with the STM and TI boards in both FORTH and C with help from some fellow Time-Nuts. It has become apparent that the TI launchpad will not be able to hit the speeds needed to do the work. However its simplicity in many respects is helpful in learning about the technology along with great training tools. I am discovering that the STM Discovery board also has pretty good training tools. They are a bit harder to find. However it absolutely has the speed to do some real work and plenty of memory. So the real focus has to be on that board. My challenge to date is with the basics. These processors are very complex in how the utilize all of the IO. Every pin can do numbers of functions like A>D, D>A, interrupt, timing, clock, and general IO. The clock mechanisms are also very complex with PLL multipliers dividers and such. (Somehow all of the clock stuff has to be very useful) So for the moment I will work through these basics. I can see a solution though. Matthias who reads time-nuts every so often introduced me to some digital techniques on captured wwvb signals that I sent to him that show great promise. Like 30-50 db of tracking gain. You need that on wwvb in the summer. He uses FORTH to program much and I may also. But because of the documentation available for C for both the STM and the Launchpad I will start there to come to terms with all of the base register programming of these chips. Thats at least the start of this thread. Regards Paul WB8TSL _______________________________________________ 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.