[hpsdr] Some thoughts on plug-in board layout

[Lyle Johnson]

Using Phil's sketch as a starting point.

1) a 100mm x 100mm board, with the DIN connector centered, has a nominal 
distance of 0.300" from the edge of the DIN connector to the edge of the 
PC board.

2) Phil suggests we need at least 12,7mm (0.500").  This means we need 
to add 0.200" to the side of the PCB that has the I/O connectors.  On 
Phil's drawing this is towards the left; on a PCB layout looking at the 
component side, this is on the right.

3) Just to be safe, I'll add 0.300" (7,62 mm) to that side of the PCB. 
This will allow plenty of margin for error.  We have to position ATLAS 
with custom mounting holes in a PC case, so having a little extra depth 
here should not be a problem.

4) The rest of the additional size for the 120mm width will be added to 
the opposite side of the PCB.  This is (20 - 7,62 = ) 12,38mm, or 0.490".

5) The datum for the PCB now falls on the lower *right* corner, making 
all of the X offsets negative since we're in the 2nd quadrant instead of 
the first quadrant.  This gives us a consistent reference location for 
any length of PC board: 120mm, 160mm, 185mm, etc.

***

Given the above, I locate pin A1 of the 96-pin DIN connector at location 
  (-18,4mm, 5.3mm) or  (-0.725", 0.210").

Steve, Phil, do you concur that this location will work?

783,

Lyle KK7P


 1148652233.0