Possible APOC signal with multiple AFSK modulations

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Possible APOC signal with multiple AFSKAudio Frequency-Shift Keying modulations
APOC.PNG
Frequencies 454.475 MHzMegaHertz (MHz) 10^6 Hz454,475,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
454,475 kHzKiloHertz (kHz) 10^3 Hz
Frequency Range 454475000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).454,475 kHzKiloHertz (kHz) 10^3 Hz
454.475 MHzMegaHertz (MHz) 10^6 Hz
454475000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).454,475 kHzKiloHertz (kHz) 10^3 Hz
454.475 MHzMegaHertz (MHz) 10^6 Hz
Mode FMFrequency Modulation
Modulation AFSKAudio Frequency-Shift Keying
Bandwidth 10000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).10 kHzKiloHertz (kHz) 10^3 Hz
0.01 MHzMegaHertz (MHz) 10^6 Hz
10 kHzKiloHertz (kHz) 10^3 Hz
0.01 MHzMegaHertz (MHz) 10^6 Hz
10 kHzKiloHertz (kHz) 10^3 Hz
0.01 MHzMegaHertz (MHz) 10^6 Hz
Location Chicago, IL
Short Description Probably one of the only "possible" APOC signals I have seen in the US so far. Even rarer its modulated as AFSKAudio Frequency-Shift Keying. Inside of this page as an explanation of how this signal turned out
I/Q Raw Recording
Audio Sample

I have heard of the possible advanced paging protocol APOC being POCSAG's advanced brethren, but due to Phillips unfortunately bankrupt thingy and other contracts, it was left out and unheard of. But I may have a hand on one that is still active In Chicagoland Area, with a frequency of 454.475 MHzMegaHertz (MHz) 10^6 Hz, I have never heard anything but STRANGE come out of my Pro 106 scanner's speaker. Screeching high baudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. speeds of about 3 types of 1200 BaudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. speeds, (that is with the normal AFSKAudio Frequency-Shift Keying modulation of POCSAG) as well as some changes in some modulated frequencies for some 1200 Bauds, as well as (maybe) a 3200 baudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. signal, and about 2 types of 2400 baudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. signals. As well as the standard AFSKAudio Frequency-Shift Keying paging link 1200 and 2200 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). 512 BaudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.. But due to negative strands, this was recorded off of the radio scanner unfortunately, but with enough strength to give a spectrum...

there is also a ring appearing to be VERY distorted, but with the waveform AND spectrum actually taking about the same amount of bandwith, (10000 hz), and of course MDC 1800.


Samples and images to follow this extremely weird and convoluted signals.


Samples[edit]



Here's an example below ive generated in audacity that (should) sound quite similar to this. This was actually very hard to do via formatting the correct type of bitstream, and getting the frequencies right for most of the mark and space tones that appear on this carrier.


Images[edit]

APOC3.PNG APOC2.PNG

APOCex1.PNGAPOCex2.PNGAPOCex3.PNGAPOCex4.PNGAPOCex5.PNG