A lot of people are replacing the king KX155 with a KX155 post mod 16 this is the cheaper option but not far over the horizon is the 8.33 com channel spacing ,i know its only for flight above FL245 at the moment but you can bet that its heading this way.
At the moment only the GNS 430/530 and the king KX165A offer 8.33 and both require 28VDC so most aircraft will need a transformer , i would recomend that the 8.33 option is taken if you intend to keep the aircraft as it will save you money in the long run.
Some will doubt my policy but its looking like a repeat of the 360-720-760 channel upgrade of 20 years back !.
[ 24 September 2001: Message edited by: A and C ]