I'd suggest using the quadrature modulator block to build a better TX side. Iterate on that until your signal looks correct. Then you can focus on the RX.
On Wed, Feb 14, 2018 at 3:14 AM samuel verdon <sam.ver...@gmail.com> wrote: > 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 > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > -- Very Respectfully, Dan CaJacob
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