On Wed, 31 Mar 2010 18:33:40 +0100, David Cutter wrote: >all >military vehicles, land sea and air, require a separate dc return other than >the chassis for the battery negative terminal. Filter caps for emc are >returned to the chassis of the equipment which is strongly bonded to the >chassis of the vehicle and dc return is a separate wire to the battery >supply negative.
That's nice. Unfortunately, vehicles sold to the public often do NOT have anything approaching bonded chassis. After buying a Toyota Sequoia several years ago during a Chicago winter, I took it into the heated loading dock at K9IKZ's business to scope out the installation of an HF rig. First thing we checked was body bonding. It wasn't pretty -- for all practical purposes, ALMOST NONE of the body parts showed anything approaching a low DC resistance between them. We found bolts inches apart with 30 ohms between them, and almost ten ohms between the battery negative terminal and the chassis! Tom -- it's really good to see you here. Your experience and engineering chops are greatly appreciated. 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
