I can't answer your question but it is the 5th for an unintentional
radiator and the 10th for an intentional radiator.

Bob Heller
3M EMC Laboratory, 76-1-01
St. Paul, MN 55107-1208
Tel:  651- 778-6336
Fax:  651-778-6252
=========================


                                                                           
             "Grasso, Charles"                                             
             <Charles.Grasso@e                                             
             chostar.com>                                               To 
             Sent by:                  "emc-pstc" <[email protected]>      
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                                                                   Subject 
             04/23/2006 01:23          Q on FCC upper frequency            
             PM                        measurement                         
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           




Hi all,


Anyone who tests for FCC compliance knows that there is an upper frequency
requirement that is basedon the highest frequency used. Does anyone know
why (for clocks >1GHz) the FCC picked the 5th harmonic as the limit?


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