Re: [Xylo-SDR] Teamspeak FPGA discussion - Have we painted ourselves into a corner? Boxed ourselves in?

[KD5NWA <kd5nwa@cox.net>]

Leon will be pulling his hair out if we totally keep changing the
card.

PCI cards are very expensive, you have to cut the board to have the edge
connector. No cheap deals with PCI.

At 01:57 PM 1/21/2006, you wrote:
> Folks
>  
> We had a long discussion regarding transporting intra board RF signals on
> the feature connector side of the board.
>  
> Just for verbal clarification regarding the project enclosure: Designers
> have ONLY ONE 100 mm edge for connections to the outside world.
> Connections between boards can ONLY be done over the buss. The other
> three sides are totally blocked by the enclosure and backplane.
>  
> Cecil, Bill  and I did discuss possible options for board
> interconnects NOT on the bus for RF or lvds sigs.
>  
> Dip header (perhaps 10 pin) for twisted pair lvds sigs mounted recessed
> away from the front panel on the project board. Meaning they would not
> protrude through the front panel.
>  
> The boards when slid into the enclosure, would be about 1/8? from the
> front face of the enclosure, allowing RG-174 or twisted pair to pass from
> board to board, along the front of the enclosure behind the aluminum
> front panel.
>  
> It occurs to me that we really have ?boxed ourselves in? with our EuroBus
> design. It seems that we really do need an RF bus and a slow speed buss,
> to really make this a universal design.
>  
> Although we have spent a great deal of time discussing this, we don?t
> have one penny invested yet.
>  
> I?m for going back to the PCI buss passive backplane design I originally
> suggested. Drop the caboodle in an Aria (or whatever) enclosure with
> power supply and have done with it. That way project designers have any
> size board  with suitable L-Bracket mounting. PCI is going to be
> around for some time yet. Also we can use a ?twisted pair? IDC connector
> or scsi cable at the rear of the boards for the high speed lvds stuff.
> There is PLENTY of room in a mini-itx enclosure for crystal ovens and
> other bulky things like 100 w PA?s etc. Fans for ventilation etc. 
> Plenty of prototyping board options. Plenty of leds on the front panel
> etc.
>  
> Remember we are not at commit stage.
>  
> Comments?
>  
> 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 ... "