Hi Priyank, The packet decoder is checking for a preamble sequence in the data stream. If there is no output coming from the decoder the preamble is probably not being detected. How does the output of the gmsk demod look like? Also, are you transmitting the signal or are you just simulating locally?
Cheers, Julian > Am 24.08.2015 um 21:05 schrieb Patel, Priyank <priyank.pa...@gtri.gatech.edu>: > > Hello, > > I am trying to get a simple packet radio GRC working but so far have had no > luck with the following scheme: > > tcp-source (port 9000) -> packet encoder -> gmsk mod -> gmsk demod -> packet > decoder -> tcp-sink (port 9001) > > If I remove the encoder/decoder and the gmsk mod/demod and go directly > between the ports, then I am able to clearly see everything (I am using two > terminals, one for tcp source and one for tcp sink). If I add back in the > gmsk mod/demod I see stuff in my other terminal window (although it is > garbled). Once I add the packet encoder nothing gets through again. > > I've been trying to follow some examples of this done in the past, but they > were with much older versions of GNU radio and some of them used GR-extras > which is no longer supported in GnuRadio 3.7. > > Any help would be greatly appreciated. > > Thanks! > > Priyank Patel > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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