Morad HF Skywave HF Skywave Data Modem for Beyond-Line-of-Sight Communications without Satellite

The Morad HF Skywave is the HF skywave ionospheric propagation data modem designed for the operational scenario where beyond-line-of-sight data communication is imperative and dependence on commercial or military satellites represents a single point of failure — due to access saturation during crisis, intentional GPS signal degradation affecting TDMA satellite system synchronization, or physical destruction of ground segments of the satellite network in high-intensity conflicts.

The modem operates in the HF 2-30 MHz range using ionospheric reflection to establish data links of 500 to 3000 km range without any intermediate infrastructure — no repeaters, no satellites, no microwave towers — with a propagation latency of 3-10 ms, comparable to medium-orbit satellite communication systems but without per-bandwidth access cost. The 19.2 kbps data rate in STANAG 4539 Serial Tone mode is sufficient for compressed operational email, situation reports, target coordinates, compressed intelligence images, and GPS position updates in the JREAP/VMF protocol.

The ALE (Automatic Link Establishment) system conforming to MIL-STD-188-141B continuously scans up to 100 preconfigured frequencies, evaluates ionospheric channel quality in real time via a prediction algorithm based on the geomagnetic disturbance Kp index, and automatically selects and establishes the link on the best available frequency in under 30 seconds — without operator intervention and without requiring the operator to understand ionospheric propagation concepts.