HFU HF Underground
Loggings => HF Mystery Signals => Topic started by: Token on August 14, 2015, 1546 UTC
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This topic has been moved to Utility (http://www.hfunderground.com/board/index.php?board=2). It is a STANAG 4481 FSK signal.
http://www.hfunderground.com/board/index.php?topic=22896.0