Re: Clock frequencies

Doesn't sound like you're missing anything. We are just talking about different things. Common disease, here! Certainly, for the same directive gain, the aperture of an antenna is smaller at higher frequencies. However, I'm not holding gain constant, but size. If the two antennas are the same p

Re: Clock frequencies

ssing? -- >From: Cortland Richmond <72146@compuserve.com> >To: Ken Javor , ieee pstc list >Subject: Re: Clock frequencies >Date: Wed, Sep 18, 2002, 8:34 PM > > An antenna of some physical size will indeed have gain increasing with > frequency. There is some just

Re: Clock frequencies

An antenna of some physical size will indeed have gain increasing with frequency. There is some justification, a 1 GHz antenna being reasonably small, for assuming that antennas will have similar sizes -- and increasing gain -- above 960 MHz. However, I suspect that the original limit was simply a

Re: Clock frequencies

esn'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" >To: "'John Woodgate'" , emc-p...@majordomo.ieee.org >Subject: RE: Clock fre

Re: Clock frequencies

Neil, Section 15.33 of FCC Part 15 "Frequency Range of Radiated Measurements" provides you with this information. Regards Joe Martin Applied Biosystems

RE: Clock frequencies

from these products. What problem are we trying to fix with limits tighter than the FCC's? Ghery -Original Message- From: John Woodgate [mailto:j...@jmwa.demon.co.uk] Sent: Wednesday, September 18, 2002 1:53 PM To: emc-p...@majordomo.ieee.org Subject: Re: Clock frequencies I re

Re: Clock frequencies

I read in !emc-pstc that Pettit, Ghery wrote (in ) 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 b

Re: Clock frequencies

Neil, Section 15.33 of FCC Part 15 "Frequency Range of Radiated Measurements" provides you with this information. Regards Joe Martin Applied Biosystems

RE: Clock frequencies

Neil, Work is progressing in CISPR SC I to generate limits above 1 GHz for CISPR 22. This would be a requirement in more than just the EU. There is much disagreement as to what the limits should be. The latest proposal that was out for comments used the FCC limits up to 18 GHz, but with a modi

RE: Clock frequencies

Section 15.33 (b) For unintentional radiators: (1) Except as otherwise indicated in paragraphs (b)(2) or (b)(3), for an unintentional radiator, including a digital device, the spectrum shall be investigated from the lowest radio frequency signal generated or used in the device, without going bel

Re: Clock frequencies

At 10:53 AM 9/18/02 +, Neil Helsby wrote: I read somewhere, and now cannot find, a reference to FCC requirements with respect to the relationship between clock frequency and highest emissions scan frequency. Can anyone help, preferably pointing to the FCC document? I also seem to rememb