[TenTec] Paragon II RS-232 noise

[Jim Brown]

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