Unidentified MFSK on 7739 (7740) kHz
From Signal Identification Wiki
This MFSKMultiple Frequency Shift-Keying signal was transmitted in short bursts. It resembles VARA but transmission was outside of any ham radio band.
Samples[edit]
Frequencies[edit]
USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) tuned to 7739 kHzKiloHertz (kHz) 10^3 Hz, center frequency about 7740 kHzKiloHertz (kHz) 10^3 Hz.