Hi If you look in detail at the ups and downs of the TAPR SDR project, it's not one I would want to emulate.
If we have a few hundred people interested with cash in hand, this might indeed make sense. Bob -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chris Albertson Sent: Thursday, December 16, 2010 3:36 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Frequency counter recommendation Here is an example of doing something like this as a open source design by a group of HAMs http://www.tapr.org/kits_janus.html This is a software defined radio but is close to the complexity we are talking about here. It has a d/a converter and fpga and lots of surface mount parts. TAPR is able to have these made and sell them for $180. While this is a proof by example that such a project can be done I'd not go this route. Better I think to design a modular system where the modules have easy and well defined interfaces and where each can have whatever quality specs are desired. There is a danger with these group project that you run into a requirements "race" to the top and end up with a hard to manufacture and maintain part. I think the HPSDR project did this On Thu, Dec 16, 2010 at 11:20 AM, Bob Camp <li...@rtty.us> wrote: > Hi > > Yes indeed, been there done that. Not very hard at all. > > All you need is the six layer pc board (can be bought), the FPGA (Digikey > has them), a few of these and a couple of those. Spend less than $100 and > you are in business if the PC board volume is high enough. > > In this case the next step in the business is to solder the 256 ball 1 mm > spacing BGA package down on the pc board. Not so easy without the right > tools... > > Bob > > -----Original Message----- > From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On > Behalf Of Don Latham > Sent: Wednesday, December 15, 2010 3:48 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Frequency counter recommendation > > OK, time-nuts, here's the gauntlet. can't "we" generate a design for a > PC-based FPGA or chip setup that would be generally useful as a counter? > We've seen thorough discussions about trigger jitter, which IMHO is the > fundamental problem. And isn't the PIC2 Time base from 10 MHz standard, > all else should be straightforward. > I'm not a designer, just a messer-arounder, or I'd give it a shot. Robot > Basic is a nice PC software maybe. > Don > > J. L. Trantham, M. D. >> I suspect that this question will lead to a discussion of Dual Mixers but >> as >> far as the counter question goes, I would recommend you consider an HP >> 5370B. >> >> Joe >> >> -----Original Message----- >> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on >> Behalf Of Dave M >> Sent: Wednesday, December 15, 2010 1:55 PM >> To: TimeNuts >> Subject: [time-nuts] Frequency counter recommendation >> >> I'm a retired electronics tech and computer programmer. I have a pretty >> decently equipped shop for almost all of my projects and experiments. >> However, my time and frequency equipment is a bit long in the tooth. I >> have >> a couple old HP 5328A counters (commercial version; not the military >> version), one with a 10544, the other with a 10811 oscillator. >> I have an HP Z3801A that has been operating well for several years, and >> recently acquired a TBolt to keep the counters in tune. I also have a >> good >> distribution amp and couple of old Montronics (Fluke) frequency >> comparators. >> What I'm looking for now, is a recommendation for a good low-cost (<$400) >> counter that will get me on the way to performing some of the "down in the >> grass" noise, jitter and deviation tests that the more learned members of >> the group discuss. I know that new equipment is far out of my budget, but >> I'm also aware that some of the older, now obsolete (also cheaper) >> equipment >> is quite capable of doing what I want to do. I prefer HP equipment since >> manuals are much easier to find than most other brands. >> I'd also like recommendation for a good low-cost GPIB controller that >> allows >> me to write software to control some of my instruments. I have experience >> writing software in BASIC on a Fluke 1722A controller. I've seen these >> controllers on the Bay and other online vendors, but I've not located the >> BASIC discs for them. Any advice? >> I realize that a counter is not the only piece that I need, but it's first >> on my list. Other, more applicable equipment is on my want list, but will >> have to wait for a bit. >> >> Thanks for advice, >> David >> dgminala at mediacombb dot net >> >> _______________________________________________ >> 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. >> ----- >> No virus found in this message. >> Checked by AVG - www.avg.com >> Version: 10.0.1170 / Virus Database: 426/3317 - Release Date: 12/15/10 >> >> >> _______________________________________________ >> 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. >> > > > -- > "Neither the voice of authority nor the weight of reason and argument are > as significant as experiment, for thence comes quiet to the mind." > R. Bacon > "If you don't know what it is, don't poke it." > Ghost in the Shell > > > Dr. Don Latham AJ7LL > Six Mile Systems LLP > 17850 Six Mile Road > POB 134 > Huson, MT, 59846 > VOX 406-626-4304 > www.lightningforensics.com > www.sixmilesystems.com > > > _______________________________________________ > 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. > > > _______________________________________________ > 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. _______________________________________________ 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.