[hpsdr] Some thoughts on plug-in board layout

Fri May 26 04:00:13 PDT 2006

Attached are my 1000 words on your layout.
I compared the published pictures of the  Atlas boards to what we have 
in our lab...they match
I used the location of the power connector position on the front and 
back as a reference to locate the external connector side of the ATX 
case and the Atlas board
Was ATLAS changed before it was sent out?

ANYONE Please feel free to correct me if I have misread anything
I am getting old...I have to use a microscope to do my work...I do 
still make mistakes
But I can still learn  :-)

Peter Hughes
N7BMG

   Phil and group,

Attached is a mechanical drawing I did to hopefully understand the 
dimensions of
an individual card.  I placed 100mm, 120mm, 160mm, and 185mm dimensions.

Will someone tell me what the base measurement system will be (metric 
or
inches)?  I think it should be metric, however, the DIN 41612 has base
dimensions appear in inches.

Phil, in your ATLUS PLUG-INS drawing, you show 12.6 mm from the bottom 
of the
PCB to the end of the DIN 41612 plug.  I think this is actually 7.37 
mm.  The
12.6 mm is the top of the DIN plug plastic to bottom, not how it is 
mounted to
the PCB.

The DIN plug that I used what the one Lyle called out for JANUS (AMP 
P/N
650473-5).

I don't really understand the "external connector area".  Is this PCB 
material?
Or is this just an placeholder?  What is the interface plane?

So looking at the card from the component side, the DIN connector is on 
the
bottom, connectors on the left.  So nothing should be in top or to the 
right?
What notes should be added to this drawing to aid the prospective card 
designer?
Hopefully this drawing can be used as a basis for anyone starting a 
card.
Everyone, please comment on the dimensions you think should be put on 
it.

The other drawing I would like to do has common components that should 
be on all
plug in boards (serial epprom, etc.).  I need help if someone could 
list what
these items are.  I can look at JANUS and OZY for examples.

- Steve N7HPR

-----Original Message-----
>From: Philip Covington <p.covington at gmail.com>
>Sent: May 25, 2006 2:24 PM
>To: Lyle Johnson <kk7p at wavecable.com>
>Cc: Open High Performance SDR Project <hpsdr at hpsdr.org>
>Subject: Re: [hpsdr] Some thoughts on plug-in board layout
>
>***** High Performance Software Defined Radio Discussion List *****
>
>On 5/25/06, Lyle Johnson <kk7p at wavecable.com> wrote:
>> Phil,
>>
>> >> I see pluses and minuses to each form factor.  I don't have any
>> >> problem changing it or redoing the OZY layout (since it isn't too 
far
>> >> along).  Lyle is further along on JANUS and he makes some good 
points
>> >> about signal flow in a previous post.  It matters less with the 
OZY
>> >> board since it is pretty much all digital signals (other than the 
USB)
>> >> and there are not the concerns of separating the analog and 
digital
>> >> sections like there is in the JANUS.
>> >>
>> >> Take a look at the drawing about and please comment.  We need to 
get
>> >> this resolved soon so we proceed with the JANUS and OZY.
>>
>> This makes the smallest card 100mm high and 120mm wide if I 
understand
>> the drawing correctly.
>>
>> I'll see if I can fit Janus into this footprint.
>>
>> 73,
>>
>> Lyle KK7P
>
>Hi Lyle,
>
>Yes, the smallest would be 100x120mm if we adopt the form factors
>spelled out in the PDF drawing I did.  Basically anything between
>100x120mm and 100x220mm should be no problem to fit in an ATX case (if
>so inclined).  I just showed different board lengths based on Alex's
>proposal (100x185mm) and added some of my own:
>
>100x120mm
>100x160mm
>100x185mm
>100x220mm
>
>The smallest size (100x120mm) was based on having enough clearance
>around the DIN41612 and still allowing external connectors to go all
>the way to the bottom of the board.
>
>The largest size (100x220mm) was based on staying within the ATX
>motherboard footprint.  I think the PCI card spec says that PCI cards
>can be 312mm long, but I haven't seen any that long in a long while!
>220mm (8.6") keeps us within the 9.6" length ATX motherboard
>footprint.
>
>The cards and ATLAS ATX power connector are oriented so the power
>connector is located as the ATX spec suggests.
>
>73 de Phil N8VB
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\r\n- Steve\r\n  (n7hpr at tapr.org)\r\n

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