Signal currently present:
US/ NATO data mode STANAG 4481 (aka NATO-75) is currently broadcasting on HF-GCS secondary channel 4724 kHz over the CONUS. A commonly used digital mode, but not too often seen on primary or secondary channels, it's more common to tertiary mil frequencies throughout the HF spectrum. One of the dedicated uses of this mode is for minimum tech requirement for shore to ship broadcast systems. #hamradio #intelligence #Military #UnitedStates #NATO

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