Abstract: A digitally tuned digital radio frequency memory that captures a portion of a first radio frequency signal and retransmits the portion as a coherent radio frequency signal. The digitally tuned radio frequency memory may include a track and hold configured to track and hold the first radio frequency signal and to output a shaped signal; a digitizer configured to convert the shaped signal to a digital word; a memory configured to store the digital word; and a direct digital frequency synthesizer configured to provide a sampling clock signal, wherein the sampling clock signal is provided to the track and hold.