Re: [Xylo-SDR] Aria Case... DIN41612 Backplane...

["Christopher T. Day" <CTDay@lbl.gov>]

Ok, overstating the case for dramatic effect, I suspect this group has
now gone off the deep end. Remember the days when Eric was so happy
about the Xylo and how the 2"x2" board fit in his shirt pocket and he
could carry it around with him? Remember the idea of a couple of little
boards in a small box that could be tossed in a backpack or luggage?
Remember how cute the SoftRock is? Well, now we have a behemoth that
weighs in at more than 12 lbs., is a couple of times the size of the
SDR-1000 and uses boards that are about 6" on a side. And those are now
getting the cute little daughter cards that this whole thing started out
with. What happened?


Chris


-----Original Message-----
From: vk4str [mailto:vk4str@netspace.net.au] 
Sent: Sunday, January 22, 2006 5:45 PM
To: Xylo-SDR Discussion
Subject: Re: [Xylo-SDR] Aria Case... DIN41612 Backplane...

Hi Eric, Phil et al,

> 
> Done deal as far as I'm concerned. Just needa board on standard PCI 
> board spacings, hopefully using the standard drill holes in the bottom

> of the ATX standard cases to mount the board (not essential, but 
> quick). Mother board also needs an ATX 20 pin connector. (I think I 
> found a source of pcb mount... NOT your common connector)
> 
> I just keep thinking about all those standard 4 pin molex thingies 
> floating around in the enclosure to power Xtal ovens front panels, and

> other neat stuff! Also now the board designers can put 
> 'non-real-world' connectors like SMB on another 2 surfaces of the
board.! Good Bye Rose+Bopla!
> 

Looking good, I think we are on track! The Aria case allows for a lot of
freedom and provides enough room for expansion etc. We have plenty of
options with that case.

Eric, the newer ATX v2.0 power supply standard is using a 24 pin
connector. Older pre-v2.0 ATX PS use a 20 pin connector, but it can be
plugged into the 24 pin, flush up on one side. Providing a 24 pin PS
connector would give us backward compatibility for all ATX PS's.

Another suggestion regarding the boards, it would be best to construct
analog input circuits and certain RF modules as Daughterboards, in such
a way that they can be 100% shielded and plugged into IDC connectors on
the boards with the bus and digital interface etc.

That would make those boards 'thicker' than any digital only board, so
we need wider spacing of the backplane connectors.

There's a lot of good inputs and the reflector is getting very busy. The
positive thing is that we are looking at all avenues before we are
locking ourselves in. That way the $$ will also be kept at an acceptable
level.

Good work from all, keep it coming! 73, Helmut VK4STR

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