Gary, AB7R wrote (re K2 clicks): "Is this problem only when driving an amp or is it also present with just the KPA-100 too?" ========== It doesn't matter whether it's the basic K2, the K2/100, or when driving a linear amplifier. The clicks are still +/-1.5 kHz wide. They're more noticeable to others when you're QRO, i.e., when your signal is stronger. 73, de Earl, K6SE