Earlier I posted a query about a change in my ATU behavior and the appearence of Hi reflec messages. I checked my RF cable and recalibrated the KA100 swr bridge. That cured the problem - but I'm not sure what I could have done to create the problem in the first place! Must have done something when I installed the DSP, but don't know what! Anway, thanks for your help folks...! 73/Tim NZ7C