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Using Carrier Sleuth to Find the Fine Details of DX by Nick Hall-Patch Introduction  Medium wave DXers are not all technical experts, but most of us understand that the amplitude modulated signals that we listen to are defined by a strong carrier frequency, surrounded on either side by a band of mirror image sideband frequencies, containing the audio information in the broadcast. Most DXers’ traditional  experience of carriers has been in using the BFO of a receiver, using USB or LSB mode, ...