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Re: [Xylo-SDR] Questions - Enclosure - MB - Kicad



Cecil

"A coupla cubits one way or the other don't matter!"

Yep, not including connectors! Since we can disassemble or assemble this
thing in a wink of an eye, we only have to buy the number of connectors we
need for the project we are working on.

For instance:

If Phil Covington designs an RF digitization unit and marries it with Leon's
FPGA then I only need 2 Din connectors! Elementary and Economical! (smile)

Eric




-----Original Message-----
From: xylo-sdr-bounces@lists.ae5k.us [mailto:xylo-sdr-bounces@lists.ae5k.us]
On Behalf Of KD5NWA
Sent: Saturday, January 14, 2006 2:08 PM
To: Xylo-SDR Discussion
Subject: Re: [Xylo-SDR] Questions - Enclosure - MB - Kicad

I say, forget inches, forget millimeters, let's measure everything in
cubits.

Be glad you are not in the military and under fire, there indecision 
can be deadly.

The price sounds good, I assume not counting connectors.


At 12:12 PM 1/14/2006, you wrote:
>Phil and Everyone
>
>I have Googled till I gurgled. I have a change of plan to propose,
regarding
>enclosure, since there has been a lot of discussion on number of  buss
>connector slots, board dimensions, descrete component mounting, like gps
>satellite receiver subsystem board etc. There is no question in my mind
that
>EuroBus 3U design is the way to go, since there is a LOT of off the shelf
>stuff for it, even power supplies.
>
>I really could not find a 'stock' enclosure with enough height for
>horizontally mounted boards, which really meet our requirement. Also Phil
>N8VB wants to start design, so 'dropped back' and thought again about the
>mount.
>
>I got quotes from my local Rose+Bopla rep for Aluminum extrusions I posted
>before.
>
>http://www.rose-bopla.com/PMX/RSBPCatg.nsf/65680fe57e02219d85256bbc00506958
/
>e5046498ec7af42885256bdc00516cdc?OpenDocument
>
>
>Minimum order is only $100, they can cut the extrusion for $2.00 a cut.
>Other services are available.
>
>The end plates unfortunately are prohibitively priced. 1 dust proof end
>plate cost more than a  4x6x6 enclosure. However I feel that it will be a
>cinch to make our own end plates, perhaps out of single or double sided
>circuit board material or aluminum in a 4x6 configuration.
>
>Proposal:
>
>I propose that we go for the Rose-Bopla 4x6x(X) enclosures The length
>dimension will allow mounting the motherboard on an aluminum backpanel with
>standoffs with a little 'easment' for getting the MB perfectly aligned with
>the slots in both the x and y dimension. Project boards would be vertically
>mounted, sliding in from the front. If we have 4 motherboard slots, we have
>approximately 3 inches for other slide in cards not buss connected, like
>power supplies.
>
>NOW! ????
>
>We could go with (X) being 2+ inch giving us the "2X4" which is our board
>design suggestion.
>
>Obviously X can be any depth enclosure so project board size so we can
>renegotiate the 2x4 standard.
>
>Or we could make the enclosure a standard Eurocard depth of 6 inches and
>mount the project card of any length up to 6" on an inexpensive standard
4x6
>inch blank circuit board (About $2 for blank 4.x 6 cards).
>
>The drawback to this suggestion is that we would then have to come off
board
>with any front panel mounted devices from the 4" by variable length project
>board. Also the connectors would have to be bulkhead mounts. Project boards
>would have to have patch cables to the front panel, which probably is not
>pretty for stuff like USB, RF etc.
>
>I therefore propose that we increase the proposed project card size from
2x4
>to 4x4 which is a 'happy medium' which Phil suggests below. This also
allows
>for Phil - VK6APH BPF board, A Jupiter GPS receiver etc. For 'Dead Bug'
>expeimenters like Bill - KD5TFD, he could use a 4x6 full length card and
>have 2" sticking out the front for experimenting without a card extender.
It
>also allows us to get on with Motherboard design with a maximum vertical
>dimension of 96 mm. (case height between lands). I propose the motherboard
>height dimension be the the size of the 96 pin mating connector (3.7"). The
>holes in the connector will mate with standoffs for rigidity.
>
>I think a 4x6x4 enclosure would make a cute little radio!
>
>Enclosure Cost without end panels on a 4x6x4+ case would be about:
>11 dollars. Nice dustproof Endcover when everything is finally plugged in
>(If ever) is 15 dollars. Gives us the flexibility to be an 'anything'
>device.
>
>WATSA?
>Eric
>
>-----Original Message-----
>From: xylo-sdr-bounces@lists.ae5k.us
[mailto:xylo-sdr-bounces@lists.ae5k.us]
>On Behalf Of Philip Covington
>Sent: Wednesday, January 11, 2006 9:49 PM
>To: Xylo-SDR Discussion
>Subject: Re: [Xylo-SDR] Questions - Enclosure - MB - Kicad
>
>Eric,
>
>Yes, if you could come up with a simple drawing of the board positions
>and how you want to fit it into a case it would help a lot.  Then we
>can see whether we can arrange things within the limits of the
>motherboard size of approx 4 x 4".  I checked tonight and it looks
>like a 4 layer 4x4" PCB would be about $25/ea in a batch of 25 boards.
>
>I would like to get this pinned down because I want to get started on
>a LTC2208 2x4" format board.
>
>As far as no active components on the motherboard:  I think we should
>have a smt LED for each of the power buses on the motherboard.
>
>73 de Phil N8VB
>
>On 1/11/06, Eric Ellison <ecellison@comcast.net> wrote:
> > Phil
> >
> > Spectacular! I advocate Kicad! If we could import the parts it is BETTER
> > than Eagle. (smile).
> >
> > I'll try to get a 'picture' of the MB. I would like to keep the 2x4
design
> > for the front mounted components and add 1 4x4 board to the rear to
> > accommodate larger parts such as Phil's BPF board, and have the rear
>mounted
> > board have access to the buss, although not necessarily many of the
> > connections. The rear facing board would have the power supply, antenna
> > connections facing rearward.
> >
> > Eric
> >
> >
> >
> >
> > -----Original Message-----
> > From: xylo-sdr-bounces@lists.ae5k.us
>[mailto:xylo-sdr-bounces@lists.ae5k.us]
> > On Behalf Of Philip Covington
> > Sent: Wednesday, January 11, 2006 7:14 PM
> > To: Xylo-SDR Discussion
> > Subject: Re: [Xylo-SDR] Questions - Enclosure - MB - Kicad
> >
> > On 1/11/06, Eric Ellison <ecellison@comcast.net> wrote:
> >
> > > Stupid question. Is it possible to mount one 96 pin staggered
connector
>on
> > > the back of the Motherboard. My dyslexic mind can't figure it. Are all
>the
> > > traces on plated through holes in 2 planes.
> >
> > Don't know what you mean here.  Can you make a drawing of what you are
> > proposing?
> >
> > > Kicad posted a new version in the last few days. Someone on the forum
> > > contributed a parts designer. Drill stuff was apparently solved in a
> > > December (or earlier) release. I'm back to Kicad, it REALLY IS an
>elegant
> > > program. There is an Oracad translator but didn't see if this was for
> > > 'parts' or schematics or what. I didn't see an Eagle .lib translator,
>but
> > > that WOULD be great!
> >
> > There is.  It is called exp-kicad-lib.ulp
> >
> > http://www.philcovington.com/BAK/exp-kicad-lib.ulp
> >
> > You have to run it from inside Eagle as a user language program.  It
> > will export the libraries in Kicad format.
> >
> > Also,  I am able to know compile Kicad on Windows (I could only
> > successfully compile it under Linux before) so if anyone is interested
> > I can tell you what I did to get the enviroment set up to compile it.
> >
> > 73 de Phil N8VB
> >
> > >
> > >
> > > Eric
> > >
> > >
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Cecil Bayona
KD5NWA
www.qrpradio.com

"I fail to see why doing the same thing over and over and getting the 
same results every time is insanity: I've almost proved it isn't; 
only a few more tests now and I'm sure results will differ this time ... " 

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