Path: utzoo!attcan!uunet!convex!killer!ames!pasteur!ucbvax!decwrl!hplabs!hp-pcd!hplsla!hpvcla!johne From: johne@hpvcla.HP.COM (John Eaton) Newsgroups: comp.sys.ibm.pc Subject: Re: 40 MHZ 286? Message-ID: <4740021@hpvcla.HP.COM> Date: 19 Sep 88 16:24:35 GMT References: <342@intek01.UUCP> Organization: Hewlett Packard, Vancouver, WA Lines: 14 <<<> >not true. digital methods work very well at 40MHz. lead length >becomes a factor and power requirements go up, but nothing >resembling "radio-frequency engineering". ---------- 40 MHZ is in the VHF band and is above the 30 Mhz limit where Class B radiated begins. The biggest problem in passing FCC is not the fundamental but the harmonics of the clock, you can easily see the first twenty clock harmonics from a digital clock. EMI protection is becoming more and more important in product design. John Eaton !hpvcla!johne