Unknown 409
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|---|---|
| Frequencies | 409.6 MHz |
| Frequency Range | 409.6 MHz - 409.6 MHz |
| Mode | NFM |
| Modulation | PSK |
| ACF | — |
| Location | Worldwide |
| Short Description | Unknown chirping like sound. Has BPSK modulation, ~600 Bd |
| I/Q Raw Recording | — |
| Audio Sample | |
Description[edit]
Unknown chirping like sound. Has BPSKBinary Phase-Shift Keying (1 bit per symbol) modulation, ~600 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.
User suggests "Unknown 409 is probably APRSAutomatic Packet Reporting System, an amateur radio-based system for real time tactical digital communications of information of immediate value in the local area / AFSKAudio Frequency-Shift Keying decodeable with http://sourceforge.net/projects/qtmm/files/ at FMFrequency Modulation mode" Doubtable since PSKPhase-Shift Keying, but could try. --Cartoonman (talk) 08:50, 30 December 2015 (NZDT)
Link to IQQuadrature signals form the basis of complex RF signal modulation and demodulation, both in hardware and in software, as well as in complex signal analysis. file: https://www.dropbox.com/s/xr1m8epuf1pt0nt/IQ%20files.rar
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