[time-nuts] Frequency counter recommendation
bownes at gmail.com
Mon Dec 20 23:04:42 EST 2010
Lol. Ok. You're added to the group.
I've started a topic on form factor.
On Mon, Dec 20, 2010 at 10:45 PM, Don Latham <djl at montana.com> wrote:
> Hi benevolent dictator. Please not the @#$%^& Eurocard. As you say, the
> connectors and backplane cost more than the stuff on the cards (except
> maybe the stuff from Hittite :-). Rather a stack of cards with .1 in.
> spacing .025 pins? That way, we can put the stack in any housing we want.
> If a suitable processor card (e.g. propeller or Arduino) is selected,
> daughterboards can be stacked on that.
> Just thinkin'. I've joined the google group.
> Bob Bownes
> > Well said Chris. Take a look at the initial spec in the OpenCounter Gogle
> > group and tell me what you think with respect to your item #1. I think
> > core counter is going to be the really difficult part of the module list.
> > Item #2 is going to be a tough one methinks. I love Eurocard, but, as you
> > say, it is very expensive, if only for the connectors. In cases like this
> > I'm a fan of either repurposing commercially available connectors (PCI
> > memory DIMMS are two I have used in the past) because they can be a)
> > purchased off the shelf, b) are manufactured in enough volume to make
> > cheap,
> > and c) are common enough that the really cheap amongst us can get them
> > of scrap boards someplace for little or nothing. The N2PK VNA is built to
> > fit into a particular HAmmond enclosure that I like but again, there are
> > many options. My feeling is that the enclosure should not dictate any
> > functional design decisions.
> > #3 - I've created a group and appointed myself benevolent dictator. We
> > discuss things, propose designs or design criteria, call for a concensus,
> > accept, and draft volunteers to design that section to the defined spec.
> > If
> > there are multiple competing designs, so much the better, as long as we
> > all
> > agree on the interfaces. Sound like a process? Can you tell I've done
> > once or twice? :)
> > Step one will be to agree on the overall functional spec. If we get
> > participants, I'd like to nail that down by mid January. The next step is
> > to
> > agree on the interfaces between the modules. Same process, discuss,
> > propose,
> > draft, get concensus, close and move on.
> > Then we get folks working on the individual modules.
> > On Mon, Dec 20, 2010 at 8:43 PM, Chris Albertson
> > <albertson.chris at gmail.com>wrote:
> >> On Mon, Dec 20, 2010 at 2:51 PM, Dave M <dgminala at mediacombb.net>
> >> >
> >> .. never got off the launchpad because of their inability to come to
> >> > consensus on a set of features. I had to conclude that too many cooks
> >> > spoiled the broth. Everyone that had input to the project was
> >> unwilling
> >> to
> >> > yield on anyone else's ideas. Hopefully, our project won't degrade
> >> into
> >> > another such fiasco.
> >> THAT is the number one problem to solve. Technical issues are easy
> >> I think the solution is to
> >> (1) chop the project up into small enough parts, each on it's own PCB
> >> so that each part is "easy" and has some wider user outside the
> >> project.
> >> (2) Find a mechanical standard so all the PCBs can be mounted in some
> >> kind of chassis. I'm thinking now that maybe a 160-3U Eurocard would
> >> be about right size. But the parts are expensive.
> >> (3) Need some sort of design process that allows everyone to
> >> contribute. And everyone can. Projects always are lacking technical
> >> writers and quality control people
> >> Of those a "process" and "mechanical standard", I think are the
> >> hardest. We always give managers a hard time but that is what is
> >> needed. The person who will make this happen will be a manager and
> >> organizer maybe not a designer.
> >> --
> >> =====
> >> Chris Albertson
> >> Redondo Beach, California
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> "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
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