Me too, please. Darren
On 07/06/12 00:20, John Malsbury wrote: > PS - The decoder I built was tested with live recordings of a stensat > beacon from the phonesat group, so I think it will certainly work in > your case - if only with minor modifications. > > -John > > On Wed, Jun 6, 2012 at 4:18 PM, John Malsbury <john.malsb...@ettus.com > <mailto:john.malsb...@ettus.com>> wrote: > > Adam, > > I apologize if I'm misunderstanding your question. But the packet > decoder in GNU Radio is not an AX.25, just a general purpose > decode. I've hacked together an AX.25 receiver with the N200. I > can send the files to you tomorrow. > > -John > > > > On Wed, Jun 6, 2012 at 3:52 PM, Adam Gunderson > <agunder...@ssel.montana.edu <mailto:agunder...@ssel.montana.edu>> > wrote: > > Hello, > > We are currently trying to setup a ground station for GMSK > modulated AX25 packets at 9600 and 19200. > > Our current setup that works is the USRP N200 through GNU > radio audio sink and to a Kantronics 9612+ TNC > (gmsk_demod.png, quadrature demod -> audio sink). What we want > to do is replace the hardware TNC with GNU radio packet > decoding blocks and send the packets over TCP. > > We first tested the loopback through all the gmsk mod/demod > and packet encoder/decoder blocks, (gmsk_loopback.png) and > this works fine. > > However, when we send our received AX.25 packets through GMSK > demod -> packet decoder -> TCP sink (gmsk_demod.png) we do not > see anything on the TCP server side, which tested fine in > loopback. > > We are assuming the hangup is in the packet decoder block as > it is not recognizing AX.25 packets or possibly at the end of > the GMSK demod block. > > Do we need to look into writing our own packet decoder > block? If we need to do this, is there a good guide on how to > edit existing blocks, or look at their work() functions? > > Do we need to also implement a derandomizer block before we > even can start making sense of the bit stream? > > If we were able to get a byte stream with the framed AX.25 > packets as an output from GNU radio to our TCP server we can > deframe them there instead of in GNU radio, but we cannot get > any output with this current setup. > > We have also looked at trying to get the GMSK Spacecraft > Groundstation project to work but the versions must be out to > date because the files located > on https://www.cgran.org/wiki/GMSKSpacecraftGroundstation won't make. > > Thanks > > -Adam > > -- > Adam K. Gunderson > Space Science and Engineering Lab > Montana State University > agunder...@ssel.montana.edu > <mailto:agunder...@ssel.montana.edu> > > <mailto:agunder...@ssel.montana.edu> > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org <mailto:Discuss-gnuradio@gnu.org> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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