[Elecraft] Re: Elecraft Digest, Vol 16, Issue 11

[Stuart Rohre]

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