Abstract: A high frequency (HF) radio configured to process an incoming call from another HF radio, the HF radio comprising: an adjustable-bandwidth tunable bandpass filter configured to provide HF signals that are within an adjustable-bandwidth Staring Frequency Band (SFB), being a subset of a HF band, the HF signals including analog calling signals that are indicative of incoming calls; a receive path configured to convert the analog calling signals to digital calling signals; a plurality of receivers configured to monitor assigned Automatic Link Establishment (ALE) channels within the SFB for 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 digital calling signal that is indicative of the incoming call; and select the SFB and the assigned ALE channels, based on an indication of ionospheric propagation conditions.

Abstract: A high frequency (HF) radio configured to process an incoming call from another HF radio, the HF radio comprising: an adjustable-bandwidth tunable bandpass filter configured to provide HF signals that are within an adjustable-bandwidth Staring Frequency Band (SFB), being a subset of a HF band, the HF signals including analog calling signals that are indicative of incoming calls; a receive path configured to convert the analog calling signals to digital calling signals; a plurality of receivers configured to monitor assigned Automatic Link Establishment (ALE) channels within the SFB for 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 digital calling signal that is indicative of the incoming call; and select the SFB and the assigned ALE channels, based on an indication of ionospheric propagation conditions.

Abstract: A multi-channel communication device comprising: a plurality of receivers, each usable for receiving radio-signals within a corresponding distinct selected frequency band within a spectrum; a Radio Frequency (RF) power splitter usable for splitting an input radio-signal into a plurality of split radio-signals; and a filter bank that comprises a plurality of filters each having a respective distinct passband within the spectrum, and a routing mechanism configured to route each of the split radio-signals into respective selected filters of the filters, selected in accordance with the selected frequency band of each of the receivers, wherein each of the selected filters outputs a corresponding output radio-signal, in the passband of the respective filter, to a respective receiver of the receivers.

Abstract: A multi-channel communication device comprising: a plurality of receivers, each usable for receiving radio-signals within a corresponding distinct selected frequency band within a spectrum; a Radio Frequency (RF) power splitter usable for splitting an input radio-signal into a plurality of split radio-signals; and a filter bank that comprises a plurality of filters each having a respective distinct passband within the spectrum, and a routing mechanism configured to route each of the split radio-signals into respective selected filters of the filters, selected in accordance with the selected frequency band of each of the receivers, wherein each of the selected filters outputs a corresponding output radio-signal, in the passband of the respective filter, to a respective receiver of the receivers.