Strange Pulsed Signal - Frequency 7.000 MHz? - Possible Numbers Station/MFSK

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Strange Pulsed Signal - Frequency 7.000 MHz? - Possible Numbers Station/MFSK
SEÑAL PARA INVESTIGAR-spectrogram.png
Frequencies "kHz-7100kHz." is not declared as a valid unit of measurement for this property.
Frequency Range 0 Hz - 0 Hz
Mode digital
Modulation MFSK
ACF
Bandwidth 3 kHz
Location Ecuador
Short Description Detected this signal during a solar flare event. The pattern appears highly structured, almost like an intentional data injection. After running a preliminary spectrogram, I noticed what appear to be alphabetical artifacts. Needs expert analysis to confirm if it's a new type of beacon or something else. Audio sample attached
I/Q Raw Recording
Audio Sample

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.