Strange high piched signals following some pattern. Any idea what it might be?
2016-12-15 16:46 GMT at 7041.5kHz
Recorded with the website of the University of Twente in the Netherlands using the built in recorder.
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Type
Wave (.wav)
Duration
3:49.694
File size
3.1 MB
Sample rate
7119.0 Hz
Bit depth
16 bit
Channels
Mono
Comments
7 months, 4 weeks ago
Since signalwiki appeared most of those weird noises are being identified. They're slowly taking away the fun on shortwave radio. : /
1 year ago
Nice, Thank you !
7 years, 3 months ago
It's just an amateur radio weak signal digital mode called jt65 or something like it, mixed with some old fashioned RTTY and I think CHIP64. Several JT65 stations can be heard packed into a small frequency range. The bit-rate is very slow and it uses more than just 2 alternating tones. It can be received when the human ear can't even hear the tones, that's why these digital modes are popular these days. Lots of people with small antennas inside apartments and home owner's association dominated neighborhoods that don't allow outside antennas can still play on the ham radio hf bands. Hams can use the output of their computer's sound card to generate any odd digital mode they can dream up with as many varying tones they care to use. This is in the 40 meter amateur band, not military.
9 years, 5 months ago
aliens
9 years, 5 months ago
this sounds like RTTY45 to me. it's a common digital mode for ham radio operators to send text.
