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Re: [Discuss-gnuradio] Resending a strange demodulated signal
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Hans Van Ingelgom
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Re: [Discuss-gnuradio] Resending a strange demodulated signal
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Tue, 8 Dec 2015 17:28:40 +0100
Yes I've seen something like this. It is used with NOAA weather satellites, and the system is called APT there.
https://en.wikipedia.org/wiki/Automatic_Picture_Transmission
"The signal itself is a 256-level amplitude modulated 2400Hz subcarrier, which is then frequency modulated onto the 137 MHz-band RF carrier. Maximum subcarrier modulation is 87% (±5%), and overall RF bandwidth is 34 kHz."
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