Douglas County Sherriffs office purchased lots of instant-on Ka band radar guns in the summer of 2006. I first noticed the shift from K band earlier this summer, and confirmed it with a cop aquantence that I have. If your detector gets even a weak Ka band signal that is intermittent, you better slow her down promptly. Their instant-on will go off and on according to their impatient desires. DC Sherrif and NHP love to hang out on all under-rated speed sections, such as the 55 mph zone at the bottom of the hill on North end of the county.