How does the K3 passband tuning work?
The K3 includes passband tuning. It’s designed to take maximum advantage of its large number of crystal roofing filters and IF DSP in combination. There are two sets of controls: SHIFT/width, and hi-cut/lo-cut. Tapping a single button switches between the two. An optimized DSP graphic on the LCD sits just above the knobs, and shows you at a glance whether the passband has been shifted or narrowed as a result of using these controls. The most appropriate roofing filter is selected automatically as these controls are rotated. If you have one of our [pending] variable-passband crystal roofing filters installed, then the 1st IF bandwidth (crystal filter) will closely track the 2nd IF bandwidth (DSP). This is far superior to receivers that have only wide roofing filters and try to do the whole job at the DSP, as well as receivers that simply shift one filter against another at two different IFs.
