Another thing about modern computers and lower noise therein, is they use a 10 MHz master clock then dither it, and multiply it to the Gigahertz max speeds. Thus instead of a single spur at a frequency, they have the clock energy spread over a band with each frequency having less power.
And, modern logic families are going to lower voltages, no more 3.5 to 5 volt TTL. 2 volts and less will be used to lessen the swing of voltages. The dithered clocks may be the biggest improvement to computer noise, since cabinets are still all plastic. However, they incorporate tin shields over some critical areas like the switching power supply and use ferrites and line filters there. Stuart K5KVH _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
