UNID UHF MilSat/RFI Whooping Signal
 | |
|---|---|
| Frequencies | 269.642 MHz,269.644 MHz |
| Frequency Range | 269.642 MHz - 269.644 MHz |
| Mode | USB |
| Modulation | — |
| ACF | — |
| Bandwidth | 2.5 kHz |
| Location | |
| Short Description | Weak, dirty NFM transmitter being rebroadcast through UHF milsat. Whooping is a result of a keyed transmitter with no one speaking. |
| I/Q Raw Recording | — |
| Audio Sample | |
Signal was recorded around 1:00 AMAmplitude Modulation EST with a homemade 250 MHzMegaHertz (MHz) 10^6 Hz X-yagi for the military satellite band. The signal is consistent except for short periods where it becomes one continuous tone before returning to the 'whooping' or oscillating tones. At the time of recording, the UHFUltra High Frequency (300-3000 MHz) milsats visible from my location were FLTSATCOM 4, FLTSATCOM 7, USA-115 and USA-99 - all above at least 30 degrees of elevation.
It appears similar to the alarm sound that radio pirates on these military satellites will sometimes play to be a nuisance, but I suspect it isn't that as it is only audible in USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) mode. The signal has appeared recently, as I often browse the top end of the milsat band and find very little activity outside of the common idle data transponders from milstar and the likes.
Edit: After some investigating and sampling the signal when able to find it, it appears to be an extremely weak and dirty NFMNarrowband Frequency Modulation voice signal, likely as a result of being rebroadcast over a weak satellite transponder. The whooping sound seems to be produced when no one is speaking but the microphone is keyed. -71strad
Samples[edit]
Frequencies[edit]
269.642 MHzMegaHertz (MHz) 10^6 Hz - 269.644 MHzMegaHertz (MHz) 10^6 Hz
