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Re: [Discuss-gnuradio] Continous Transmission using GNU RADIO. Is it rea

From: Joe K
Subject: Re: [Discuss-gnuradio] Continous Transmission using GNU RADIO. Is it really possible?
Date: Mon, 13 May 2019 10:55:53 -0700


Hopefully I'm not hijacking Mehtap's thread too badly but it seems that the website with gr-eventstream documentation is no longer available.  It doesn't seem that there's much inline documentation or anything else in the git repo.  Am I missing something?  Does anybody have cached copies of the documentation?  It sounds like gr-eventstream could be useful to me but without much saying what, exactly, it does, it's a bit difficult to parse.  The GRC blocks don't have inline documentation available for the most part and their ports aren't immediately clear as to what they're doing.  Google isn't coming up with much either.

Thanks and sorry if the info is already out there and I'm just not seeing it.


On Mon, May 13, 2019 at 5:46 AM Müller, Marcus (CEL) <address@hidden> wrote:
Hi Mehtap, please answer on the list.

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

Best regards,

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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