Hello everyone, I have a 5680 which is failing to lock. My DDS frequency is 8388608Hz, but it's sweeping between about 8388638 and 8388740. My unit has 3 levels of PCBs in the DDS/VCO corner and there is no trimcap labeled C217. Does anyone know how to adjust the sweep center frequency on this type of 'triple decker' unit? Thanks, =Simon=