Unknown 504p690

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Unknown 504p690
Unknown 504p690 Screenshot.PNG
Frequencies 504.6250MHz504,625,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
504,625 kHzKiloHertz (kHz) 10^3 Hz
Frequency Range 504625000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).504,625 kHzKiloHertz (kHz) 10^3 Hz
504.625 MHzMegaHertz (MHz) 10^6 Hz
504625000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).504,625 kHzKiloHertz (kHz) 10^3 Hz
504.625 MHzMegaHertz (MHz) 10^6 Hz
Mode Unknown
Modulation Unknown
Bandwidth 4 tones BW = 8KHz"tonesBW=8KHz" is not declared as a valid unit of measurement for this property.,extra tones not considered"extra tones not considered" is not a number. kHzKiloHertz (kHz) 10^3 Hz
MHzMegaHertz (MHz) 10^6 Hz
kHzKiloHertz (kHz) 10^3 Hz
MHzMegaHertz (MHz) 10^6 Hz
Location Brisbane, Australia
Short Description

IQ FILE IN DESCRIPTION

Signal which looks like a very wide 4MSK, but also has some tones to either side of the 4 main tones. Seen at 22:38 AEST, but not at 22:42 AEST.
I/Q Raw Recording
Audio Sample

Description[edit]

A signal which looks like a very wide 4MSK, but has other tones to either side of the 4 main tones. Was seen at 22:38 AEST, but not at 22:42 AEST.

Analysis[edit]

Frequency shift of ~2260 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). consistent with all tones involved. Total BW ~18100 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). Including the tones outside the 4 main ones. When all 4 main tones are off, one of the outside tones is on. there is always one tone on at any given moment.

baudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. rate 50 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. consistent with all tones involved. Same length for every tone, even the outside ones.

Conclusion: possible 8MFSK very wide. extremely wide. Tones seen are consistent with transmission of data. Warrants further investigation.


--Cartoonman (talk) 07:04, 13 January 2016 (NZDT)

Samples[edit]

IQ ZIP File (HDSDR format, 2.4Msps)

Frequencies[edit]

The strongest version of the signal is found on 504.6250MHz. There are other duplicate signals around, some centered at 504.560MHz, 504.693MHz, and 504.760MHz.

Additional Images[edit]

All of the many duplicated signals seen