Just to further muddy the waters:
During a previous life running a test house, we used yet another interpretation. The highest "fundamental" was the highest frequency brought out of any chip. If a separate VCO distributed 10x of the crystal to other chips, 10x was the number. If the multiplier was purely internal to a part like a lot of CPUs and display chips, the crystal frequency was the highest. Brent DeWitt Datex-Ohmeda Louisville, CO "John Harrington" <[email protected]>@majordomo.ieee.org on 08/02/2001 01:42:25 PM Please respond to "John Harrington" <[email protected]> Sent by: [email protected] To: "Gary McInturff" <[email protected]> cc: <[email protected]> Subject: Re: FCC - radiated emission up to 10th harmonic Gary, Amund We have always chosen the highest "fundamental" frequency as the highest original frequency generated, normally a crystal or other oscillator. Frequencies derived from the fundamental, via multipliers etc, are not considered as fundamental. John Harrington RF Group Manager Nemko Canada -----Original Message----- From: Gary McInturff <[email protected]> To: '[email protected]' <[email protected]>; [email protected] <[email protected]> List-Post: [email protected] Date: Thursday, August 02, 2001 11:59 AM Subject: RE: FCC - radiated emission up to 10th harmonic > > Interesting question and there is a corollary to it. If a crystal >oscillator is stepped up in frequency, with PLL circuitry for example, now >what is the highest frequency. > My current opinion is that for Amund's question it is the crystal >frequency, and to mine, it is the PLL frequency. IN both cases they >represent the highest repetitive clock speed or digitally generated >frequency. > Interested in seeing the other responses. > Gary > >-----Original Message----- >From: [email protected] [mailto:[email protected]] >Sent: Wednesday, August 01, 2001 1:19 PM >To: [email protected] >Subject: FCC - radiated emission up to 10th harmonic > > > >Dear members, > >FCC 2.1057 is about radiated emission. They say :"If the equipment operates >below 10GHz: to the tenth harmonic of the highest fundamental frequency or >to 40 >GHz, whichever is lower". > >I ask: Highest fundamental frequency, is it the crystall oscillator with >highest frequency or is it the highest operating frequency within the EUT >(after mixing, muliplier, etc..) ? > >Best regards >Amund Westin >Oslo, Norway > >-- >Get your firstname@lastname email for FREE at http://Nameplanet.com/?su > >------------------------------------------- >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: > [email protected] >with the single line: > unsubscribe emc-pstc > >For help, send mail to the list administrators: > Michael Garretson: [email protected] > Dave Heald [email protected] > >For policy questions, send mail to: > Richard Nute: [email protected] > Jim Bacher: [email protected] > >All emc-pstc postings are archived and searchable on the web at: > http://www.rcic.com/ click on "Virtual Conference Hall," > >------------------------------------------- >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: > [email protected] >with the single line: > unsubscribe emc-pstc > >For help, send mail to the list administrators: > Michael Garretson: [email protected] > Dave Heald [email protected] > >For policy questions, send mail to: > Richard Nute: [email protected] > Jim Bacher: [email protected] > >All emc-pstc postings are archived and searchable on the web at: > http://www.rcic.com/ click on "Virtual Conference Hall," > > ------------------------------------------- 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: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on "Virtual Conference Hall," ------------------------------------------- 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: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on "Virtual Conference Hall,"
