Talk:Advanced Paging Operations Code (APOC)
This sounds very cool...But I thought it was basically a flex and pocsag system combined...But I never knew you could transmit at 6400 bit pocsag, it would sound similar to flex...Ywsia1
HOLD ON PLEASE. There might be one transmitter still being used by Ameritech mobile services in Chicago, transmits similar baudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. speeds (yes I can detect these WITH my own ears) such as 2400 baudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second., 4800 baudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second., and 3600 BaudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. APOC. I rarely hear the 6400 baudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. one. It also transmits 512 baudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. and 1200 baudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. POCSAG. BUT!!!! its AFSKAudio Frequency-Shift Keying modulated instead... So, it might be hard to hear the higher baudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. speeds as the marks and spaces are packed so tightly close together, as well as find the closer peaks. (due to the higher baudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. rate of the PCM or 'FSKFrequency-Shift Keying'.) It also transmits several other modulations, such as a 1200 hz sine wave and 2200 hz sine wave at the beginning or end of each transmission. It even has a weird sounding idle tone to it, (actually theres two) one being the regular POCSAG idle and the other a very convoluted idle tone....problem is like I said its all AFSKAudio Frequency-Shift Keying. not your typical FSKFrequency-Shift Keying transmissions. If your near chicago and have an rtl sdr and tune to "454.475 MHzMegaHertz (MHz) 10^6 Hz" youll understand what im talking about. Too many modulations... Ywisa1
Unfortunately, I'm not near the chicago area. I'd love to get my hands on an 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. sample though...--Cartoonman (talk) 01:48, 31 August 2017 (NZST)
Hey did that sample I added seem to be accurate? Its in AFSKAudio Frequency-Shift Keying, unfortunately. I had to use 3 different custom audacity plugins to generate that. It took a while, too.
