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On Fri, 7 Jul 1995 13:02:02 EST you wrote: >I just opened it and it >contains two pieces of metal (not magnets) which encase the cable when >closed. Does anyone know what it does? Shielding? > Yes, what you describe is an RF choke, the purpose of which is to prevent radio frequency interference from entering your computer by way of the power cord. It is important, for the choke to work properly, for the choke to be as close to the computer end of the cable as possible. The power cord can act as an antenna, bringing radio frequency energy into the computer circuitry, wreaking all kinds of havoc. Most of the time you don't need an RF choke, but those of us who have strong sources of radio frequency energy nearby appreciate the fact that IBM takes this precaution. Many or most computer manufacturers ignore this precaution, alas. ----------------------------------- Roger J. Buffington USC Law, Class of '97 AB6WR Go Trojans!! WARPing with PM-Mail |Microsoft Network is prohibited from redistributing this work in any form, | |in whole or in part. Copyright, 1995. License to distribute this post is | |available to Microsoft for $1,000. Posting without permission constitutes | |an agreement to these terms.