Unknown 40
 | |
|---|---|
| Frequencies | 409.6 MHz |
| Frequency Range | 409.6 MHz - 409.6 MHz |
| Mode | NFM |
| Modulation | — |
| ACF | — |
| Bandwidth | 5 kHz |
| 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
It is very likely some form of un-shielded electronics, potentially the lighting described above, saw many similar signals in power line analysis. - 20180321 - ADPG
