Howdy,
The K3 and KX3 are very different radios.
Where the K3 is a traditional superhet receiver with software-upgradable features, the KX3 is a fully software defined radio with a direct conversion receiver. Where the KX3 is optimized for low current draw and portability, the K3 is optimized for very high performance, though the KX3 is no slouch in this area.
--
Buddy Brannan, KB5ELV - Erie, PA
Phone: (814) 860-3194 or 888-75-BUDDY