Unknown 40

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Unknown 40
Unknown40 Waterfall.jpg
Frequencies 409.6 MHzMegaHertz (MHz) 10^6 Hz409,600,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
409,600 kHzKiloHertz (kHz) 10^3 Hz
Frequency Range 409600000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).409,600 kHzKiloHertz (kHz) 10^3 Hz
409.6 MHzMegaHertz (MHz) 10^6 Hz
409600000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).409,600 kHzKiloHertz (kHz) 10^3 Hz
409.6 MHzMegaHertz (MHz) 10^6 Hz
Mode NFMNarrowband Frequency Modulation
Modulation
Bandwidth 5000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).kHzKiloHertz (kHz) 10^3 Hz
0.005 MHzMegaHertz (MHz) 10^6 Hz
kHzKiloHertz (kHz) 10^3 Hz
0.005 MHzMegaHertz (MHz) 10^6 Hz
kHzKiloHertz (kHz) 10^3 Hz
0.005 MHzMegaHertz (MHz) 10^6 Hz
Location Worldwide
Short Description Hi,I found a strange signal on 40.693mhz, maybe you know what this is and/or could add this to your sample list. It has a bandwidth of about 4000-5000 hz and the low part repeats about every 2,5 seconds, the high part every 5 seconds (as shown in picture 1 rec1.png). Sometimes (2-3 times an hour) this signal has some variations - show in picture 2 rec2.png. I also provided you an audio sample of about 20 seconds, recorded in RAW. Do you know what this signal could be? Its online 24/7 since a month now. regards, Auge
I/Q Raw Recording
Audio Sample

Description[edit]

Hi,I found a strange signal on 40.693mhz, maybe you know what this is and/or could add this to your sample list. It has a bandwidth of about 4000-5000 hz and the low part repeats about every 2,5 seconds, the high part every 5 seconds (as shown in picture 1 rec1.png). Sometimes (2-3 times an hour) this signal has some variations - show in picture 2 rec2.png. I also provided you an audio sample of about 20 seconds, recorded in RAW. Do you know what this signal could be? Its online 24/7 since a month now. regards, Auge

Unknown 40!! I've heard it too.. there is usually something idling.. sometimes the transmission is longer.. one day there was two stations of it. here https://www.youtube.com/watch?v=GTIQnC3f5U0 | This is probably some idling radio. --Cartoonman (talk) 08:56, 30 December 2015 (NZDT)


Likely this is a ballast for florescent lighting. Move your antenna closer to various lights and you may find the single gets louder. The changing frequency maybe the ballast warming up. -CCM

Additional Images[edit]