Hello everybody, I am building a FSK receiver to recover data on UHF. The bit rate of the data is 9,6kbps sent at 437MHz. I put all the information of the flowgraph. The data sent are a Stream of 0x55 or in binar « 1010 ». the medium between the emitter and the receiver is coax cable. Here is my flowgraph on GRC : https://ibb.co/ixMYkn
I Use a bladeRF to record the signal. The Spectrum of the reception is the following : https://ibb.co/gA6Nd7 As I can see the signal does not saturate the reception, then the signal should be readable. To summarize my flowgraph : - Multiply : to center of my signal - Low pass filter : gross filter to have the signal - Quadratur demod : demodulate the signal - Low pass filter (decimation) : keep only the signal and decimate the sample rate for the next block to 10 symbol per sample - Clock recovery MM : find the clock - Binary slicer : define 0 and 1 At the end of the flowgraph I save the data received in a file and here is the result : https://ibb.co/dJyeQn I have some holes in my file that I do not understand. I tried to use the polyphase clock sync, I also changed the filter size, Nothing change. Does anyone has an idea where my mistake is ? I am sure that my emitter send the right data. If I miss information, tell me I will provide it/them. I also can send the gnuradio flowgraph. Thank you Samv
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