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Re: [Discuss-gnuradio] Continous Transmission using GNU RADIO. Is it rea
Re: [Discuss-gnuradio] Continous Transmission using GNU RADIO. Is it really possible?
Mon, 13 May 2019 12:44:22 +0000
Hi Mehtap, please answer on the list.
The purpose of gr-eventstream is exactly to enable what you're trying.
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
> > 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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