On 12/15/2010 10:16 AM, Dr. Gerald N. Johnson wrote:
> How about checking the control board grounding, as well as the cable
> shield grounding?
Yes, cable shield connection (NOT GROUNDING) is quite important. It MUST
go to the shielding enclosure on both ends. DO NOT CONNECT CABLE
SHIELDS TO THE SO-CALLED "GROUND" PIN ON THE DB CONNECTOR -- IT USUALLY
GOES TO THE CIRCUIT BOARD, NOT THE CHASSIS. CONNECT SHIELDS TO THE
CONNECTOR SHELL!
I also recommend use of a good twisted pair, like CAT5, for serial
connections. See the chapter in
http://audiosystemsgroup.com/RFI-Ham.pdf about Solving Problems in the
Shack, also shown in the Power Point
http://audiosystemsgroup.com/HamInterfacing.pdf
73, Jim Brown K9YC
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