Re: [Discuss-gnuradio] Continous Transmission using GNU RADIO. Is it really possible?

[CEL]

Hi Mehtap, please answer on the list.

The purpose of gr-eventstream is exactly to enable what you're trying.

Best regards,
Marcus

On Mon, 2019-05-13 at 15:40 +0300, mehtap özkan wrote:
> Thank you Marcus,
>  I have looked at gr-eventstream and found it useful for bursty transmissions 
> not continous ones.
> Maybe there is a way to produce  '0's and add/ xor them with real data?
> Any advice on that? 
> 
> Müller, Marcus (CEL) <address@hidden>, 13 May 2019 Pzt, 15:23 tarihinde şunu 
> yazdı:
> > Dear Mehtap,
> > 
> > On Mon, 2019-05-13 at 15:03 +0300, mehtap özkan wrote:
> > > Dear All,
> > >  I have implemented a CPFSK transmitter succesfully using GNU RADIO.
> > 
> > Cool!
> > 
> > > The blocks are PRBS Source->Scrambler (G3RUH)-> CPFSK Mod-> UHD Sink. The 
> > > reference HW receiver receives and demodulates the signal quite well.
> > 
> > It's always a nice feeling when something works with real hardware :)
> > 
> > >  
> > > Then I remove the PRBS Source and place a UDP Source+UART block as the 
> > > data source.
> > > When the connected client sends continous data, everything is fine 
> > > (except at the start of transmission where the receiver needs time to 
> > > lock to the incoming signal).
> > > When I send some bytes from the client and stop sending, the transmission 
> > > becomes burst-like and the receiver can demodulate pretty much nothing.
> > > I found the culprit which is the Scrambler, when there is no input to the 
> > > Scrambler, there is no output, so there is no RF output.
> > 
> > Well, I wouldn't call it a "culprit", since it does what it's designed
> > to do: Scramble data. 
> > 
> > >  I have also developed a FPGA Continous CPFSK transmitter in the past and 
> > > the scrambler there was producing output every clock cycle as there was 0 
> > > in its Input, so that guaranteed continous output.
> > >  The real problem is: What should I do to force some Input bits to the 
> > > Scrambler, even there is no real data?
> > 
> > The gr-eventstream module might be of interest to you!
> > 
> > Best regards,
> > Marcus
> >

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