A high frequency, HF, radio configured to process an incoming call from another HF radio, the HF radio comprising: a plurality of receivers configured to simultaneously monitor a corresponding plurality of assigned Automatic Link Establishment, ALE, channels within a staring frequency band for one or more digital calling signals that are indicative of incoming calls, wherein the staring frequency band is a subset of a HF band, and wherein the bandwidth of the staring frequency band is adjustable; an adjustable-bandwidth tunable bandpass filter configured to obtain, from at least one antenna, first HF signals within the HF band, and to provide only second HF signals within the staring frequency band, the second HF signals including one or more analog calling signals that are indicative of the incoming calls; a first receive path (218; 520, 525, 530) connected to an output of the adjustable-bandwidth tunable bandpass filter and configured to convert the analog calling signals to the digital calling signals; and a controller configured to: establish a communication link between the HF radio and the another HF radio, in response to a given receiver of the receivers decoding a given digital calling signal of the digital calling signals that is indicative of the incoming call from the another HF radio, the given digital calling signal being communicated from the another HF radio over a given assigned ALE channel of the assigned ALE channels; and select the staring frequency band and the assigned ALE channels, based on values of parameters that are indicative of ionospheric propagation conditions at a given time. a plurality of receivers configured to simultaneously monitor a corresponding plurality of assigned Automatic Link Establishment, ALE, channels within a staring frequency band for one or more digital calling signals that are indicative of incoming calls, wherein the staring frequency band is a subset of a HF band, and wherein the bandwidth of the staring frequency band is adjustable; an adjustable-bandwidth tunable bandpass filter configured to obtain, from at least one antenna, first HF signals within the HF band, and to provide only second HF signals within the staring frequency band, the second HF signals including one or more analog calling signals that are indicative of the incoming calls; a first receive path (218; 520, 525, 530) connected to an output of the adjustable-bandwidth tunable bandpass filter and configured to convert the analog calling signals to the digital calling signals; and a controller configured to: establish a communication link between the HF radio and the another HF radio, in response to a given receiver of the receivers decoding a given digital calling signal of the digital calling signals that is indicative of the incoming call from the another HF radio, the given digital calling signal being communicated from the another HF radio over a given assigned ALE channel of the assigned ALE channels; and select the staring frequency band and the assigned ALE channels, based on values of parameters that are indicative of ionospheric propagation conditions at a given time. establish a communication link between the HF radio and the another HF radio, in response to a given receiver of the receivers decoding a given digital calling signal of the digital calling signals that is indicative of the incoming call from the another HF radio, the given digital calling signal being communicated from the another HF radio over a given assigned ALE channel of the assigned ALE channels; and select the staring frequency band and the assigned ALE channels, based on values of parameters that are indicative of ionospheric propagation conditions at a given time. <EOS>