At 03:36 AM 6/7/2002, Robert Steven Fish wrote:
>I would be very interested to know more about this RF situation, as I have
>never heard anything like it before (granted, I am not an electronics
>expert).  I thought that you simply needed to provide a way for the circuit
>to close, and if surface area was needed for anything, the entire chassis
>would provide quite a lot of area... right?  Radio waves???

There are three areas of concern: Suppression of interference to the ECU
(causing improper operation) arising either inside or outside the vehicle;
suppression of internally generated interference to radio reception; and
suppression of radio interference to other vehicles/fixed installations.

I really can't get into a discussion of this, but I refer interested
parties to pp. 816-821 of the Bosch Automotive Handbook (4th English Ed.)
and to the standards  DIN 40839 parts 1,3 and 4; and DIN 57879 parts 1,2
and 3 -- or alternatively ISO 7637 -0 /-1 /-2; ISO/DIS 7637-3; ISO/DIS
11451/11452; CISPR 12; CISPR/D 25.  And no, I don't have access to any of
those standards...

For voluminous discussion of the alternating-current skin effect, do a
google on "skin effect"

david

--
David Beierl - Providence, RI
  http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage"
'85 GL "Poor Relation"