Strange Pulsed Signal - Frequency 7.000 MHz? - Possible Numbers Station/MFSK
From Signal Identification Wiki
signal Pattern: The spectrogram reveals periodic vertical structures that don't match known natural interference or common commercial modes.
Audio Characteristics: Contains a low-frequency hum (approx. 55 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).) and rhythmic 'clicks' at the start of each pulse sequence.
Equipment: Captured using a long-wire antenna near the Pichincha volcano area, Quito.
Request: Seeking assistance for full text extraction or identification of the modulation protocol used.