Dave,

The assembly is entirely thru-hole components.  The system uses VME format
boards and it is a case of having more board area then needed to achieve the
functionality required (what a concept).  Due to the nature of the RF 
circuits, the components are grouped close together leaving relatively 
large areas unpopulated.  Of course the lack of holes in areas without 
components makes a great place to lay down circuit traces on internal layers.

Jeff

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