jcpearce wrote:
As a pet/learning project I made a data aquisition unit using an 8051
microprocessor and an EPIA M motherboard running a variant of Linux to
process and display the information. It all works but the EMI from the
EPIA M causes way too much noise to the aircraft radios. I have tried
shielding the whole device in an aluminum case with very little
improvement.

Any ideas on how to smother the EMI or some other small motherboard
which may not have as much an issue (as a test I took my portable
aviation radio and within 6' of any my home computers the same occurs
which gives me little hope)

Thanks

You obviously are knowledgeable in the
subject, but have you tried the simple
stuff first, like ferrite doughnuts on
all cables to and from the boards and
grounding one side of cable shielding etc.?
It sounds like a very interesting
project, do you have a site for more info?
Kumaros
It's all Greek to me