Hi Most stuff these days is less than 20% hardware and more than 80% software / firmware. These counters are no exception. Based on that the main opportunity for learning is on the source code side. Even being able to look at it would be a plus. Far more would come from a project / article series that digs into and explains the source code in detail.
Bob On Dec 28, 2012, at 8:56 AM, Robert Atkinson <[email protected]> wrote: > Hi, > While it may be a waste of time and money for time nuts, it may be a good > introduction for others. It may even spawn a few time nuts. Better someone > build this and learn something than just buy a cheap Chinese counter on ebay. > I've seen much worse projects published. I do agree that not releasing source > code is bad practice, especially when a project is code driven. > > Robert G8RPI. > > > > > ________________________________ > From: ewkehren <[email protected]> > To: [email protected] > Sent: Friday, 28 December 2012, 13:38 > Subject: Re: [time-nuts] 2.5 Ghz 12 digit counter project > > Lets call it what it is waste of time and money > Bert Kehren > > > > > Sent from Samsung tabletBob Camp <[email protected]> wrote:Hi > > As far as I can see, you would do *much* better with a surplus HP counter > (sub $200 or even sub $100) and some sort of pre-scaler. > > Bob > > On Dec 28, 2012, at 2:51 AM, Bruce Griffiths <[email protected]> > wrote: > >> Tom Harris wrote: >>> Watch out for Silicon Chip designs, they have a habit of not making the >>> source code available, which you only find out at the end of the project. I >>> suppose that it is to allow the author to make a few extra $$ selling >>> programmed micros. They had a nice 3 phase inverter design a year ago that >>> had this problem, I wrote to the author promising not to distribute the >>> source, I just wanted to read it, but didn't even get the courtesy of an >>> answer. >>> >>> I suspect that this counter is like the inverter, an oldish design that is >>> not worth building as you can get the same for half the cost out of China. >>> What makes it worthwhile is getting the hardware& the source code, so that >>> you can tinker with it. >>> >>> Actually I had a look at the counter and it looks similar to the 8 digit >>> designs using the Intersil 7217 IC from the 80's. >>> >>> Gripe ends. >>> >>> On 28 December 2012 06:12, Paul Amaranth<[email protected]> wrote: >>> >>> >>>> Did anyone see the article in the December Silicon Chips magazine about >>>> building a 12 digit 2.5 GHz counter? It has an option for a GPS 1pps >>>> input so you could have some expectation that the last couple of >>>> digits mean something. The website only has the article cover page >>>> in pretty much unreadable type. >>>> >>>> -- >>>> Paul Amaranth, GCIH | Rochester MI, USA >>>> Aurora Group, Inc. | Security, Systems& Software >>>> [email protected] | Unix& Windows >>>> >>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- [email protected] >>>> To unsubscribe, go to >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> and follow the instructions there. >>>> >>>> >>> >>> >>> >> I've read the entire set of articles and like most of the designs from this >> particular designer its largely an unadulterated piece of junk. >> >> Aside from the usual logic design errors I've come to expect from this >> designer the GPS PPS input is used directly to set the gate time so jitter >> on this signal directly (several tens of nanaosec or even more if sawtooth >> error is present better if the PPS is derived from a GPSDO) affects accuracy. >> >> Bruce >> >> >> Bruce >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
