[R-390] Ham Shack Grounding Help!!!!

[Drew Papanek]

Hello All,

I had a computer noise problem with an old IBM PC-XT a few years ago.
I narrowed the problem down to a specific peripheral (the keyboard) by  
disconnecting peripherals one at a time and noting a change in noise level.  
The main unit turned out to be clean.

I disassembled the keyboard and used grocery bag paper to insulate the 
entire back side of the circuit board.  I then cut a piece of aluminum foil 
to cover the insulated area, plus a "tail" which I wrapped around the bare 
cable shield braid where it entered the housing.  This backplane completely 
eliminated the noise problem.

Simpler would have been to just try another keyboard (they are cheap and 
plentiful nowadays).

Drew

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