> > My solution was to replace the 'HC390 change with the elegant > > PIC-based divider chain invented by Tom van Baak. This uses the 10 MHz > > signal as the PIC's clock, and the tight code based on a fixed number > > of wait states makes a fully synchronous divider. I was unable to > > measure ANY temperature effects. The PIC requires less real estate > > than the 'HC390s and is also quite cost effective. > > For those of you interested -- the free PIC source code > for the divider is at: > http://www.leapsecond.com/tools/PPSDIV.ASM
Very interesting. Thank you very much to both Toms for your work and the listing, and of course to Brooks, who did a fantastic job. > > Also I think Brooks Shera keeps a copy of the code at: > http://www.rt66.com/~shera/index_fs.htm > Unfortunately there is only the hex list of the pic code. As I would like to experiment as well with this modification and try to change some parameters to fit my LPRO and some different OCXOs I own, is there a way to get the commented source code of it? > Although written years ago for the PIC16C84 it works with > little modification to almost any PIC. Remember to turn on > the HS osc fuse, turn off the WDT fuse, and use a PIC part > that handles a 10 MHz clock. > > > ... > > In short -- The Jupiter-T is a good timing receiver. > > Hope these factoids helped -- Tom > > Yes, thanks much. Always a pleasure to hear from you. > The pleasure is as well mine to read all the good comments from you. I have still the idea to use a higher clock for the pulse counter instead of the 24 MHz for a better resolution. I could not get any M12+ GPS-receiver on the market, so I bought the Jupiter-T as well and I want to compare the behaviour with the Trimble Resolution T later on, but before I have to get all that running. (Is it possible to compete or beat the off the shelf solutions? ;-) ) Have always a good Time! Arnold, DK2WT -- DSL-Aktion wegen großer Nachfrage bis 28.2.2006 verlängert: GMX DSL-Flatrate 1 Jahr kostenlos* http://www.gmx.net/de/go/dsl
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