[Elecraft] laptop power supply to power KX3

[David Cutter]

To optimise the size of the supply to the load, one could examine the rms 
current draw v peak current draw.  It might only be a case of fitting a 
large capacitor close to the radio (perhaps in a tiny box or heat shrunk 
"speed bump" in the cable) to supply those current peaks from a very small 
supply.  This technique is used in some supplies that use super-capacitors 
and a small switchmode for 100W transceivers.  This has the advantage of 
creating much lower switching noise which is easier/smaller/cheaper to 
filter out.

David
G3UNA