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 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
>
>
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--
Very Respectfully,
Dan CaJacob
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