> -----Original Message----- >From: am...@westin-emission.no [mailto:am...@westin-emission.no] >Sent: Wednesday, September 04, 2002 12:35 AM >To: EMC-PSTC >Subject: Vehicle - EMC shielding effect >Sensitivity: Confidential > >Hi all, > >What is the EMC shielding effect of a military armoured >vehicle (no windows, no cabling from inside to outside, ABC >protected, etc) ? Is it 10dB or 15.5dB ? ha-ha ........ :) > Well, I assume you could pick a number between 0-100 dB, >because the EMC shielding effect will depend on a lot of >different parameters. > >But, have you ever heard about such a case, or maybe seen some >military specs what is expected? > >Best regards >Amund Westin, / Oslo, NORWAY > > >
Amund: If we are limiting ourselves to an Army ground armored vehicle, then we are talking about platform compliance to MIL-STD-461. The radiated emission and susceptibility requirements are defined from 2 MHz to 18 GHz. At the low end of that range, even big hatches will still provide reasonable shielding. But, at the upper end, almost every aperture and seam leaks, unless you are careful about bonding and gasketing. Since you said the vehicle was ABC protected, could we assume that it's also specified to withstand EMP? If so, then we should find good shielding effectiveness. When I measured the E-field SE of the Ground Launched Cruise Missile (GLCM) Transporter Erector Launcher (TEL) and the Command Trailer, the values were well over 100 dB. When the weapon system was terminated by SALT, we got a Command Trailer back from England, where it had been rolling through the countryside for several years. Aside from some RF leaks at the main door due to damaged fingerstock, the SE integrity of the trailer was still pretty good. Since our M1 & M2 vehicles were designed in the same era as the GLCM, I would be inclined to assume that they also have very good SE. If you have a valid need, you can likely get SE test data through the vehicle's military Program Office. Regards, Ed Ed Price ed.pr...@cubic.com Electromagnetic Compatibility Lab Cubic Defense Systems San Diego, CA USA 858-505-2780 (Voice) 858-505-1583 (Fax) Military & Avionics EMC Is Our Specialty Shake-Bake-Shock - Metrology - Reliability Analysis ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
