I listen to shortwave broadcasts now and then, and one signal that piqued my curiosity is this "mechanical grinding" noise I hear around 4 Mhz (i have an analog tuner so I can't tell which exactly it is)
It sounds exactly like this recording, although this is not my recording: What's that sound on Shortwave 4345Khz?
Can anyone tell me what this mode is?
It sounds exactly like this recording, although this is not my recording: What's that sound on Shortwave 4345Khz?
Can anyone tell me what this mode is?