Thank you for the answer.

I forgot to say that my graph is connected to hardware (bladerf or limesdr) via 
osmocom block. This one give me the error that there is not enough data.

Is it possible to do with hardware attached to gnuradio? All examples are 
without hardware and don’t have the clock of the hardware.

Thank you 


De : Murray Thomson
Envoyé le :Wednesday, March 28, 2018 13:01
À : GNURadio Discussion List
Objet :Re: [Discuss-gnuradio] FSK Burst emission

Have a look at this burst fsk modem too 
https://oshearesearch.com/index.php/2015/05/31/building-a-burst-fsk-modem-in-gnu-radio-with-message-lambda-blocks-and-eventstream/

On 28 March 2018 at 10:57, Jeff Long <[email protected]> wrote:
Take a look at gr-eventstream and gr-*burst.


On 03/28/2018 04:14 AM, samuel verdon wrote:
Hello everyone,

Builind a FSK tansiever, I would like to send burst data. All the fec and data 
maniupation are made with custom block working with message.

After formating everything, I  convert my data to Stream with « PDU to tagged 
Stream » block and send it to «GFSK mod » block.

This last block needs to have a steam to work (as I understand ). My burst 
messages come randomly from an UDP port and with different time interval.

When Nothing is tansmit the gnuradio flowgraph stops saying it does not have 
enough data comming to « PDU to tagged stream» to work.

How can I avoid this problem ? should I send zero between data ?  Is there a 
bloc to do this ?

Thank you

Sam


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