The HackRF One/PortaPack H2 combo in a portable case helps bridge the gap between old-school discrete radios and modern software-defined radio.

However, characterizing the factors contributing to low frequencies (the seismic source, response of the receiver, and spectral signal-to-noise) and their effects may be complicated. The Hussar, ...

Giroux explains that long-range communications are often satellite-based around ... important as some customers expect HF to work like a normal telephone system or simple UHF/VHF PTT comms. Also, ...