for my chisel-grind blades, i use a small hand sharpener from ebay, $10.
it has two tungsten carbide blades in a v @ 20 degrees for forming the main angle
then on opposite side it has two ceramic rods in a v for a nice smooth sharp finish
its use depends on what angle your knife blade has been cut at as the sharpener blades are non adjustable
for my convex-grind blades, i use a double sided leather strop and two stropping compounds - course and fine ($50 total off ebay)
this lets me attain the right angle by hand (usually about 15-20 degrees)
this way can take ages to get a knife sharp, but i can get a RAZOR edge on a 6mm thick camping knife (fallkniven s1)
for your info - drag the knife along the leather, spine first, so you dont cut the leather to pieces
if u want more info on this ask away...