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