Following this thread, I looked up the FCC limits and see they are flat above 960 MHz. I have a question for the forum. Given that a broadcast type omni-directional antenna factor increases monotonically with increasing frequency, why is the limit flat? The only way I could justify a flat limit is if antenna gain is presumed to increase with increasing frequency. This doesn't seem likely with commercial applications for microwave communications, such as LANs or cordless phones. Another possibility is that receiver sensitivity is increasing with increasing frequency, but that doesn't seem terribly likely, either. Why doesn't the limit increase with increasing frequency, or stair-step as it does below 960 MHz?
---------- >From: "Pettit, Ghery" <[email protected]> >To: "'John Woodgate'" <[email protected]>, [email protected] >Subject: RE: Clock frequencies >Date: Wed, Sep 18, 2002, 4:51 PM > > > John, > > Cable emissions seldom are a significant factor above 1 GHz. Besides, we're > supposed to tune for maximum smoke, not minimum <grin>. > > There are products on the market today that meet the FCC limits, but would > not meet the tighter limits being proposed. There are no interference > complaints from these products. What problem are we trying to fix with > limits tighter than the FCC's? > > Ghery > > > -----Original Message----- > From: John Woodgate [mailto:[email protected]] > Sent: Wednesday, September 18, 2002 1:53 PM > To: [email protected] > Subject: Re: Clock frequencies > > > > I read in !emc-pstc that Pettit, Ghery <[email protected]> wrote > (in <[email protected]>) > about 'Clock frequencies' on Wed, 18 Sep 2002: >>CISPR SC I meets next week in Christchurch, New Zealand and this will be a >>topic of discussion at the meetings. We on the US delegation will be > trying >>to keep the voices for tighter limits from being successful. > > It's really not something worth having a big argument about. To change > the measured result by 6 dB, just move one of the cables a few cm. > > This Emperor really DOESN'T have any clothes.(;-) > -- > Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk > > Interested in professional sound reinforcement and distribution? Then go to > http://www.isce.org.uk > PLEASE do NOT copy news posts to me by E-MAIL! > > ------------------------------------------- > 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: > Ron Pickard: [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://ieeepstc.mindcruiser.com/ > Click on "browse" and then "emc-pstc mailing list" > > ------------------------------------------- > 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: > Ron Pickard: [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://ieeepstc.mindcruiser.com/ > Click on "browse" and then "emc-pstc mailing list" > ------------------------------------------- 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: Ron Pickard: [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://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
