Radio receiver with automatic interference and distortion compensation

摘要

Undesired, interfering narrow band received signals in a Loran-C receiver are automatically rejected and the resulting distortion of the received Loran beacon signals caused by this rejection is automatically compensated for. The received Loran-C beacon signals in the band 90 to 110 KHz are fed through a narrow band, variable reject filter that rejects the undesired signal and is controlled by a feedback circuit in response to an interference detector in the receiver, so that the reject filter is automatically set at the interfering signal, rejecting it. Meanwhile, distortion of the received Loran beacon signals caused by the rejection is compensated for by an automatic circuit that varies a delay and add circuit in the Loran receiver to compensate for the distortion.