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DX clusters are both a blessing and a curse.I have used them a few times before to work a new one or to find out when a dxpedition is on the air but I have also been listening to a QSO in progress waiting to call and then hear nothing but QRM for +/- 5 KHz. Yes, it does take a LOT less than a few hours for it to become known that a rare one is on the air.